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Artykuły w czasopismach na temat "AUTODYN Model"
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Grunwald, Christoph, Benjamin Schaufelberger, Alexander Stolz, Werner Riedel i Thomas Borrvall. "A general concrete model in hydrocodes: Verification and validation of the Riedel–Hiermaier–Thoma model in LS-DYNA". International Journal of Protective Structures 8, nr 1 (marzec 2017): 58–85. http://dx.doi.org/10.1177/2041419617695977.
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The Riedel–Hiermaier–Thoma model, which is available in ANSYS Autodyn since 2000 as a description of concrete and similar geological materials in highly dynamic loading situations, has recently been implemented in the multi-purpose Finite Element code LS-DYNA. This article gives a brief overview of the physical details and verifies the new implementation by comparing single element test results with the established Autodyn code. Four real cases, ranging from low to very high pressure loading by impact, penetration and blast, are used to demonstrate thereafter the validity of the model in a wide range of applications. Simulation results from both codes are compared to experimental data at several occasions. Although slight differences between the implementations are observed, the overall agreement, both between the codes and with experiments, is very good. The systematic work in this publication demonstrates that the Riedel–Hiermaier–Thoma model is a useful addition to the LS-DYNA material library and shall motivate research to apply the model over a wide range of applications. A comprehensive, physically derived dataset is provided for a C70/85 high-strength concrete used in one validation case.
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Hu, Guo, Jun Wu i Liang Li. "Advanced Concrete Model in Hydrocode to Simulate Concrete Structures under Blast Loading". Advances in Civil Engineering 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/7540151.
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The formulations of the advanced concrete RHT model adopted in AUTODYN are investigated and numerical studies are conducted to study the RHT model’s actual performances under various loading conditions. It is found that using of default values in the RHT model is not able to simulate the realistic behavior of concrete under various loading conditions. Thus modified parameters in the RHT model are proposed to better capture the realistic behavior of concrete under such loading conditions. Furthermore, numerical simulation of normal concrete slabs and multilayer concrete slabs subjected to blast loading is conducted using AUTODYN with both the default and modified RHT parameters. Experimental readings from field blast tests are used to validate the numerical model developed. It is shown that the results from numerical simulations using the modified RHT parameters and the measurements from the field blast test agree well in terms of damage pattern, crater diameter, and acceleration. Hence, it can be concluded that the RHT model with modified parameters can capture the mechanical behavior of concrete structures well. The validated model can be further used to conduct a parametric study on the influence of key parameters (i.e., compressive strength, fracture energy, and thickness) on blast resistance of concrete structure.
3
Ahmad Mujahid, Ahmad Zaidi, Shah Koslan Md Fuad i Othman Mohd Zaid. "Response of Armour Plate Subjected to Blast Loading Based on Analytical Model of Second Order Single Degree of Freedom". Materials Science Forum 819 (czerwiec 2015): 387–92. http://dx.doi.org/10.4028/www.scientific.net/msf.819.387.
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The rolled homogeneous armour (RHA) plate is commonly used for armoured vehicle skin. Preliminary predictions of the deflections from RHA plate subjected to blast loading is important for establishing guidelines before it is used in vehicle skin. The goal of this work is a reliable technique for predicting the RHA plate response subjected to blast loading, and the empirical result performed by other researchers will be taken as a reference. Based on selected references, a small number of assumptions lead to the developed Single Degree of Freedom (SDOF) idealised models. This paper provides an analytical prediction for the RHA plate response using SDOF in one dimension (1D) approach. The analytical capability was subsequently verified using the non-linear fluid structure interaction (FSI) numerical simulation and the AUTODYN computer code. The midpoint deflections of the RHA plate were taken as the figure of merit. Based on the small error percentage and the support of strong analytical arguments, the second order SDOF analytical approach and numerical simulation using the AUTODYN computer code can be employed as a method of analysis.
4
Yarar, Eser, i Alpay Tamer Erturk. "Multiple-Shot Impact Model for Vibration-Assisted SMAT Process". Key Engineering Materials 905 (4.01.2022): 3–8. http://dx.doi.org/10.4028/www.scientific.net/kem.905.3.
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Surface mechanical attrition treatment enhances the mechanical properties of metallic materials by inducing high strength layer on the top surface. In this study, multiple-shot impact behavior was modeled for the 7075-T6 aluminum alloy to achieve maximum magnitudes of equivalent stress, plastic strain, residual stress depth, and residual stress. Finite element simulations have been carried out to investigate the effect of selected framework on stress and strains in constituent. The plastic deformation process during SMAT was analyzed using ANSYS/AUTODYN explicit dynamic solver according to shot velocity and diameter with a dynamic explicit finite element method (FEM). Deformation behavior was evaluated after multiple-shot impact.
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Kamarudin, Khairul H., Ahmad Mujahid Ahmad Zaidi, Ahmad Humaizi Hilmi, Mohamad Faizal Abdullah, Norazman M. Nor, Ariffin Ismail, Mohammed Alias Yusof i S. Rasool Mohideen. "Simulation Study on Hypervelocity Penetration of Lab Scaled Shape Charge Mechanism". Journal of Engineering and Technological Sciences 54, nr 6 (31.12.2022): 220613. http://dx.doi.org/10.5614/j.eng.technol.sci.2022.54.6.13.
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Shaped charge (SC) is a mechanism used by defence industries as anti-armored weapon to penetrate armored plates. Numerous studies have been conducted on the shaped charged effects. However, experimental studies are limited due to great safety requirement and limited access to high grade explosive. Due to these limitations, an experimental study on a small-scale shaped charge mechanism (SCM) penetration blast test was conducted against five (5) types of target materials. The experimental data is then verified by simulation to proof that it can be used to predict the SC penetration data. This paper intent to present a comparative study on the effect of shaped charge blast conducted by simulation with the actual experimental results. In order to conduct this study, a 2D AUTODYN software were used to develop the SC blast model against five (5) types of target materials. This study concludes that the 2D AUTODYN simulations results can predict the hypervelocity penetration for all target materials compared to the experimental test with an average difference of 9.1 %.
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Chen, Qing-hua, Yue-qiu Jiang, Yu-xin Gao, Yu-hang Liu i Jia-qi Yang. "Simplified Algorithm Model for Explosion Shockwave Load in the Cabin". Shock and Vibration 2021 (31.12.2021): 1–12. http://dx.doi.org/10.1155/2021/7726779.
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In order to obtain the shockwave load simplified algorithm model for the semiarmored projectile internal explosion in the cabin, this research made use of AUTODYN to provide a numerical modeling method for explosion in the cabin and verified the accuracy of the method via the experiment. Internal explosion simulation calculation was conducted on the operating condition numerical model with different cabin structural dimensions and different explosive loads. The cabin internal explosion space was divided into the noncorner central area, near-wall area, two-sided corner area, and three-sided corner area. Through regression of the abovementioned calculation results, an engineering model to calculate the shockwave load was obtained. It is hoped that the model can offer some references to the antiexplosion design for the ship cabin and for damage assessment of the internal explosion.
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Mohottige, Nimasha Weerasingha, Chengqing Wu i Hong Hao. "Characteristics of Free Air Blast Loading Due to Simultaneously Detonated Multiple Charges". International Journal of Structural Stability and Dynamics 14, nr 04 (2.04.2014): 1450002. http://dx.doi.org/10.1142/s0219455414500023.
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Extensive research has been conducted to investigate the characteristics of blast load due to single charge explosion, including numerical simulations and experimental blast tests in both unconfined and confined environments. Further, available guidelines for blast resistant design such as UFC-3-340-02 (2008) and ASCE 59-11 (2011) provide details to predict blast loads on a structure subjected to single charge explosion. However, blast load characteristics due to multiple charge explosions are poorly discussed in available literature. In this paper, commercially available Hydrocode, AUTODYN is calibrated for single charge explosions. Based on a comparison between numerical simulation and UFC prediction, correction factors for peak reflected pressure and positive reflected impulse as a function of charge weight, scaled distance and mesh size of the numerical model are proposed to minimize the errors in simulations. The calibrated AUTODYN model is then used to conduct parametric studies to investigate the effects of charge weight, scaled distance, number of charges and distance between the charges on the characteristics of free air blast load due to simultaneous detonated multiple charges. Numerical simulation results are used to derive analytical formulas for predictions of peak reflected pressure ratio and positive reflected impulse ratio between single and multiple explosions. The discussion is made on characteristics of free air blast load due to simultaneous detonated multiple charges.
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Choi, Mijin, Jung-Ryul Lee i Cheol-Won Kong. "Development of a Numerical Model for an Expanding Tube with Linear Explosive Using AUTODYN". Shock and Vibration 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/436156.
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Pyrotechnic devices have been employed in satellite launch vehicle missions, generally for the separation of structural subsystems such as stage and satellite separation. Expanding tubes are linear explosives enclosed by an oval steel tube and have been widely used for pyrotechnic joint separation systems. A numerical model is proposed for the prediction of the proper load of an expanding tube using a nonlinear dynamic analysis code, AUTODYN 2D and 3D. To compute a proper core load, numerical models of the open-ended steel tube and mild detonating tube encasing a high explosive were developed and compared with experimental results. 2D and 3D computational results showed good correlation with ballistic test results. The model will provide more flexibility in expanding tube design, leading to economic benefits in the overall expanding tube development procedure.
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Ding, Yu Qing, Wen Hui Tang, Xian Wen Ran i Xin Xu. "Computational Simulations of Dynamic Compaction of Dry Sand". Advanced Materials Research 598 (listopad 2012): 516–19. http://dx.doi.org/10.4028/www.scientific.net/amr.598.516.
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The computational analysis of plate impact experiments on dry sand utilizing the Mie- Grüneisen (MG) equation of state and the P-α compaction model were investigated in this study. A number of two dimensional axial symmetric computations were performed by using the hydrocode AUTODYN. The computational results were compared with the particle velocity on the back surface of the rear plate measured by the VISAR system and the first shock-wave arrival times detected by piezoelectric pins in the samples respectively. It was found that the P-α compaction model was more accurately reproduce the experimental data than the MG EOS.
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Saravanan, S. "Thermo-Structure Approach to Dissimilar Explosive Cladding with Interlayer". Journal of Physics: Conference Series 2478, nr 4 (1.06.2023): 042014. http://dx.doi.org/10.1088/1742-6596/2478/4/042014.
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Abstract A thermodynamic model capable of predicting the change in internal energy, work done, and thermal energy required during aluminum-stainless steel explosive cladding is presented. The mathematical model is instrumental in determining the temperature and pressure developed at the interface, which characterizes the interface microstructure, compared with the numerical simulation. Numerical simulation is implemented by the Smoothed Particle Hydrodynamics method available in ANSYS Autodyn. Furthermore, the effect of different interlayers, such as Al 1100, copper, and SS 304, on kinetic energy utilization and deformation work is discussed. The increase in ram tensile and shear strengths is also reported.
Rozprawy doktorskie na temat "AUTODYN Model"
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Venohr, Markus. "Modellierung der Einflüsse von Temperatur, Abfluss und Hydromorphologie auf die Stickstoffretention in Flusssystemen". Berlin Weissensee-Verl, 2005. http://www.weissensee-verlag.de/autoren/venohr.htm.
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Souza, Natalia Soares Carvalho de. "Dimorfismo sexual no modelo de infarto do mioc?rdio em ratos: aspectos neuroend?crinos e auton?micos cardiovasculares". Universidade Federal Rural do Rio de Janeiro, 2014. https://tede.ufrrj.br/jspui/handle/jspui/1574.
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Premenopausal women are less prone to develop cardiovascular diseases than men and this advantage do not persist in postmenopausal women. Thus herein we aimed to investigate the gender difference and the estrogen influence in cardiac function, fluid balance and thyroid status, in Wistar rats subjected to experimental model of myocardial infarction (MI). In the first step, adult male (n = 18) and female (n = 21) rats underwent experimental MI (MIm and MIf,) or sham-operation (ShamM and ShamF) respectively. One and four weeks post-MI rats were placed in metabolic cages, subjected to echocardiography (ECHO), electrocardiography and then euthanized for blood sample collection and tissue collection (heart, lung and liver). In the second step female rats were ovariectomized (n = 24) or continued intact (n = 21), two weeks later they were subjected to MI (MIOVX and MIINT, respectively) or sham operation (ShamOVX and ShamINT). Four weeks post-MI, they were subjected to the same evaluations of the first step, not only the electrocardiography. In the third step, female rats were subjected to ovariectomy and treated with estrogen (E2) (n = 13) or vehicle (n = 22). Two weeks later they underwent experimental MI (MIOVX+E2 and MIOVX+Veh). Four weeks post-MI they were subjected to the same evaluations of the second step. Male infarcted rats developed cardiac dysfunction (shortening fraction, SF, reduction, ~ 70%) and fluid homeostasis changes (sodium intake increasing, ~ 146% and urinary volume reduction, ~55%) earlier than female, in the first week post-MI while female presented these changes (SF reduction, ~28% and sodium intake increasing, ~143%) only in the fourth week and attenuated compared to male. MIM showed reduction in LF/HF ratio (~70%), one week post-MI. And only male rats presented hypothyroidism after MI (T4 ~52% and T3 ~38%, reduction). We also verified reduction in SF (~55%), increasing in LA/Ao ratio (~75%) and changes in fluid balance (sodium intake reduction, ~67% and urinary volume reduction, ~40%) more pronounced in MIOVX than in MIINT. MIOVX group reduced thyroid hormone levels after MI (T3 ~35%). MIOVX+Veh showed more pronounced reduction in SF (~55%) and increasing in LA/Ao ratio (~75%) than the MIOVX+E2 group. The sodium intake reduced in MIOVX+Veh (~67%) and in the urinary volume we verified significant reduction in ShamOVX+Veh and MIOVX+Veh groups compared to ShamOVX+E2 and MIOVX+E2 groups (P < 0.05). Serum T3 reduced significantly (~35%) only in MIOVX+Veh group. The pathophysiological development of heart failure post-MI was attenuated in female compared to male. And female rats subjected to MI presented fluid balance more favorable and related to the less pronounced development of heart failure. Estrogen seems to influence positively the cardiac function and attenuate the dysfunction that occur post-MI. The euthyroid status in female intact do not seems to be determinant to the less pronounced development of heart failure
Sabe-se que mulheres na pr?-menopausa apresentam menor preval?ncia de doen?as cardiovasculares do que homens e, esta diferen?a desaparece ap?s a menopausa. Sendo assim, o presente estudo buscou avaliar o dimorfismo sexual e a influ?ncia do estr?geno nas altera??es da fun??o card?aca, do equil?brio hidroeletrol?tico e do status tireoidiano de ratos Wistar submetidos ao infarto do mioc?rdio (IM) experimental. Na primeira etapa ratos wistar machos (n = 18) e f?meas (n = 21) foram submetidos ao infarto experimental (INF.M e INF.F) ou ? falsa cirurgia (Sham.M e Sham.F). Na primeira e quarta semana p?s-IM foram colocados em gaiolas metab?licas e submetidos ? ecodopplercardiografia (ECO) e eletrocardiografia (an?lise espectral), seguido de eutan?sia para coleta de sangue (dosagem s?rica de horm?nios tireoidianos) e de tecidos (cora??o, pulm?o e f?gado, para biometria). Na segunda etapa, f?meas foram ovariectomizadas (n = 24) ou mantidas intactas (n = 21) e ap?s duas semanas submetidas ao infarto do mioc?rdio (INFOVX e INFINT) ou ? falsa cirurgia (ShamOVX e ShamINT). Quatro semanas ap?s p?s-IM, as mesmas avalia??es da etapa anterior foram realizadas exceto a eletrocardiogr?fica. Na terceira etapa, foi realizada ovariectomia e reposi??o com estr?geno (E2) ( n = 13) ou ve?culo (n = 22). Ap?s duas semanas foi realizada a cirurgia de indu??o ao infarto (INFOVX+E2 e INFOVX+Veic) e a falsa cirurgia (ShamOVX+E2 e ShamOVX+Veic). Decorridas quatro semanas foram feitas as mesmas avalia??es da segunda etapa. O grupo INFM desenvolveu disfun??o card?aca (fra??o de encurtamento, FEnc%, ~70% de redu??o) e altera??es na regula??o hidroeletrol?tica (aumento do apetite por s?dio, ~146% e redu??o do volume urin?rio, ~55%), uma semana p?s-IM e, portanto, mais cedo que as f?meas, que apresentaram altera??es na fun??o card?aca (FEnc%, ~28% de redu??o) e regula??o hidroeletrol?tica (aumento do apetite por s?dio, ~143%) na quarta semana p?s-IM. O grupo INFM apresentou redu??o na rela??o LF/HF (~70%), uma semana p?s-IM. E, apenas os ratos machos desenvolveram hipotireoidismo ap?s o infarto. Tamb?m foi observada redu??o da FEnc% (~55%), aumento da rela??o ?trio esquerdo/ aorta (AE/Ao, ~75%) e altera??es na regula??o hidroeletrol?tica (redu??o do apetite por s?dio, ~67% e do volume urin?rio, ~40%) mais pronunciadas em INFOVX do que em INFINT. O grupo INFOVX tamb?m apresentou redu??o dos n?veis s?ricos de T3 (~35%) p?s-IM. O grupo INFOVX+Vei mostrou redu??o da FEnc% (~55%) e aumento na rela??o AE/Ao (~75%) mais pronunciadas que o grupo INFOVX+E2. INFOVX+Vei reduziu o apetite por s?dio (~67%) e, no volume urin?rio, foi observada redu??o significativa nos grupos ShamOVX+Vei e INFOVX+Vei em rela??o aos grupos ShamOVX+E2 e INFOVX+E2 (P<0,05). O T3 s?rico reduziu significativamente (~35%) apenas no grupo INFOVX+Vei. Houve diferen?a no desenvolvimento fisiopatol?gico da insufici?ncia card?aca (IC) p?s- IM entre machos e f?meas, sendo mais brando nas f?meas. E f?meas infartadas apresentaram uma regula??o hidroeletrol?tica mais favor?vel e compat?vel com o desenvolvimento menos acentuado da IC. O estr?geno influenciou positivamente a regula??o hidroeletrolitica de f?meas infartadas, o que favoreceu a fun??o card?aca e atenuou desta forma, a disfun??o que ocorre ap?s o infarto. A manuten??o do status eutire?ideo n?o pareceu ser determinante para o desenvolvimento menos pronunciado da IC
3
SOUZA, Natalia Soares Carvalho de. "Dimorfismo sexual no modelo de infarto do mioc?rdio em ratos: aspectos neuroend?crinos e auton?micos cardiovasculares". Universidade Federal Rural do Rio de Janeiro, 2014. https://tede.ufrrj.br/jspui/handle/jspui/1546.
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Premenopausal women are less prone to develop cardiovascular diseases than men and this advantage do not persist in postmenopausal women. Thus herein we aimed to investigate the gender difference and the estrogen influence in cardiac function, fluid balance and thyroid status, in Wistar rats subjected to experimental model of myocardial infarction (MI). In the first step, adult male (n = 18) and female (n = 21) rats underwent experimental MI (MIm and MIf,) or sham-operation (ShamM and ShamF) respectively. One and four weeks post-MI rats were placed in metabolic cages, subjected to echocardiography (ECHO), electrocardiography and then euthanized for blood sample collection and tissue collection (heart, lung and liver). In the second step female rats were ovariectomized (n = 24) or continued intact (n = 21), two weeks later they were subjected to MI (MIOVX and MIINT, respectively) or sham operation (ShamOVX and ShamINT). Four weeks post-MI, they were subjected to the same evaluations of the first step, not only the electrocardiography. In the third step, female rats were subjected to ovariectomy and treated with estrogen (E2) (n = 13) or vehicle (n = 22). Two weeks later they underwent experimental MI (MIOVX+E2 and MIOVX+Veh). Four weeks post-MI they were subjected to the same evaluations of the second step. Male infarcted rats developed cardiac dysfunction (shortening fraction, SF, reduction, ~ 70%) and fluid homeostasis changes (sodium intake increasing, ~ 146% and urinary volume reduction, ~55%) earlier than female, in the first week post-MI while female presented these changes (SF reduction, ~28% and sodium intake increasing, ~143%) only in the fourth week and attenuated compared to male. MIM showed reduction in LF/HF ratio (~70%), one week post-MI. And only male rats presented hypothyroidism after MI (T4 ~52% and T3 ~38%, reduction). We also verified reduction in SF (~55%), increasing in LA/Ao ratio (~75%) and changes in fluid balance (sodium intake reduction, ~67% and urinary volume reduction, ~40%) more pronounced in MIOVX than in MIINT. MIOVX group reduced thyroid hormone levels after MI (T3 ~35%). MIOVX+Veh showed more pronounced reduction in SF (~55%) and increasing in LA/Ao ratio (~75%) than the MIOVX+E2 group. The sodium intake reduced in MIOVX+Veh (~67%) and in the urinary volume we verified significant reduction in ShamOVX+Veh and MIOVX+Veh groups compared to ShamOVX+E2 and MIOVX+E2 groups (P < 0.05). Serum T3 reduced significantly (~35%) only in MIOVX+Veh group. The pathophysiological development of heart failure post-MI was attenuated in female compared to male. And female rats subjected to MI presented fluid balance more favorable and related to the less pronounced development of heart failure. Estrogen seems to influence positively the cardiac function and attenuate the dysfunction that occur post-MI. The euthyroid status in female intact do not seems to be determinant to the less pronounced development of heart failure.
Sabe-se que mulheres na pr?-menopausa apresentam menor preval?ncia de doen?as cardiovasculares do que homens e, esta diferen?a desaparece ap?s a menopausa. Sendo assim, o presente estudo buscou avaliar o dimorfismo sexual e a influ?ncia do estr?geno nas altera??es da fun??o card?aca, do equil?brio hidroeletrol?tico e do status tireoidiano de ratos Wistar submetidos ao infarto do mioc?rdio (IM) experimental. Na primeira etapa ratos wistar machos (n = 18) e f?meas (n = 21) foram submetidos ao infarto experimental (INF.M e INF.F) ou ? falsa cirurgia (Sham.M e Sham.F). Na primeira e quarta semana p?s-IM foram colocados em gaiolas metab?licas e submetidos ? ecodopplercardiografia (ECO) e eletrocardiografia (an?lise espectral), seguido de eutan?sia para coleta de sangue (dosagem s?rica de horm?nios tireoidianos) e de tecidos (cora??o, pulm?o e f?gado, para biometria). Na segunda etapa, f?meas foram ovariectomizadas (n = 24) ou mantidas intactas (n = 21) e ap?s duas semanas submetidas ao infarto do mioc?rdio (INFOVX e INFINT) ou ? falsa cirurgia (ShamOVX e ShamINT). Quatro semanas ap?s p?s-IM, as mesmas avalia??es da etapa anterior foram realizadas exceto a eletrocardiogr?fica. Na terceira etapa, foi realizada ovariectomia e reposi??o com estr?geno (E2) ( n = 13) ou ve?culo (n = 22). Ap?s duas semanas foi realizada a cirurgia de indu??o ao infarto (INFOVX+E2 e INFOVX+Veic) e a falsa cirurgia (ShamOVX+E2 e ShamOVX+Veic). Decorridas quatro semanas foram feitas as mesmas avalia??es da segunda etapa. O grupo INFM desenvolveu disfun??o card?aca (fra??o de encurtamento, FEnc%, ~70% de redu??o) e altera??es na regula??o hidroeletrol?tica (aumento do apetite por s?dio, ~146% e redu??o do volume urin?rio, ~55%), uma semana p?s-IM e, portanto, mais cedo que as f?meas, que apresentaram altera??es na fun??o card?aca (FEnc%, ~28% de redu??o) e regula??o hidroeletrol?tica (aumento do apetite por s?dio, ~143%) na quarta semana p?s-IM. O grupo INFM apresentou redu??o na rela??o LF/HF (~70%), uma semana p?s-IM. E, apenas os ratos machos desenvolveram hipotireoidismo ap?s o infarto. Tamb?m foi observada redu??o da FEnc% (~55%), aumento da rela??o ?trio esquerdo/ aorta (AE/Ao, ~75%) e altera??es na regula??o hidroeletrol?tica (redu??o do apetite por s?dio, ~67% e do volume urin?rio, ~40%) mais pronunciadas em INFOVX do que em INFINT. O grupo INFOVX tamb?m apresentou redu??o dos n?veis s?ricos de T3 (~35%) p?s-IM. O grupo INFOVX+Vei mostrou redu??o da FEnc% (~55%) e aumento na rela??o AE/Ao (~75%) mais pronunciadas que o grupo INFOVX+E2. INFOVX+Vei reduziu o apetite por s?dio (~67%) e, no volume urin?rio, foi observada redu??o significativa nos grupos ShamOVX+Vei e INFOVX+Vei em rela??o aos grupos ShamOVX+E2 e INFOVX+E2 (P<0,05). O T3 s?rico reduziu significativamente (~35%) apenas no grupo INFOVX+Vei. Houve diferen?a no desenvolvimento fisiopatol?gico da insufici?ncia card?aca (IC) p?s-IM entre machos e f?meas, sendo mais brando nas f?meas. E f?meas infartadas apresentaram uma regula??o hidroeletrol?tica mais favor?vel e compat?vel com o desenvolvimento menos acentuado da IC. O estr?geno influenciou positivamente a regula??o hidroeletrolitica de f?meas infartadas, o que favoreceu a fun??o card?aca e atenuou desta forma, a disfun??o que ocorre ap?s o infarto. A manuten??o do status eutire?ideo n?o pareceu ser determinante para o desenvolvimento menos pronunciado da IC.
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Venkataramana, K. "Blast Effects on Mild Steel Plates and Blast Mitigation using Fluid-filled Polymer Foam". Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4307.
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In the modern-day society, there are an increasing number of explosions, either by accidental explosions or by terrorist attacks on civilian and military infrastructure. In view of the increased threat to infrastructure and lives of people from explosions, there is an urgent need to precisely predict the blast loads resulting from detonation of high explosives, accurately assess the structural responses to blast loads and develop effective blast mitigation technologies and materials which require extensive field testing. One of the most effective methods for protection against blast waves is the use of fluid-filled cellular material as a protective cover on the structure that needs to be systematically evaluated by field testing and numerical simulations. Since blast experiments on real life structures are costly and time consuming, numerical simulation can be used as an alternative to the field experiments, provided they are validated with relevant experimental data.
The main goals of this research are:
1. Field experimental investigation of the response of clamped mild steel plates to close range spherical air blast loads and examination of the effect of standoff distance on the structural response.
2. Development of numerical models for predicting the response of structures to close range air blast loads and validation of the numerical models using the field experimental data.
3. To demonstrate and assess the potential of blast mitigation technology using fluid-filled cellular polymer foam.
In order to achieve the first objective, a series of close-range blast experiments on mild-steel plates have been conducted at different scaled distances by varying the standoff distance and the mass of explosive charge. The plates deformed into conical or spherical-dome shapes, depending on the severity of blast wave and the permanent deformation profiles and the midpoint deflections of the plates were measured after each blast event. The air-blast pressure and the dynamic strains in the plates were also measured in some of the experiments.
Towards achieving the second objective, fluid-structure coupled numerical models for the field air blast experiments are developed using the commercial finite element hydrocode LS-DYNA to simulate the detonation of high explosive in air, blast wave interaction with the structure and the plastic deformations of the plate structures. With the physically consistent coupled numerical models and the material constitutive data evolved in the present research, a good agreement between the air-blast experimental data and the numerical predictions has been achieved. Further, a numerical procedure validated with experimental data is proposed to estimate the total impulse imparted to the structure under air blast loads. In addition, an empirical relation is formulated from the field experimental data to predict the midpoint deflections of the plates subjected to close range spherical explosions in air. Additional numerical simulations are performed with ANSYS-AUTODYN and ConWep codes and the results are compared with LS-DYNA ALE simulation results and the field air-blast experimental data to assess their relative performance in predicting the structural response to close-range air blast loads.
The third goal is addressed by conducting a series of air blast experiments, on steel plates covered with cellular polymer foam filled with water, at different scaled distances to vary the intensity of blast load. Further, the effect of foam thickness on blast mitigation is investigated by varying the water-filled foam thickness from 50 mm to 100 mm.The blast mitigation is quantified by the reduction in the plate midpoint deflection and the change in the deformation profiles of the plates by comparing the experimental data on plates tested with and without the water-filled foam protection.The experiments indicate that the blast protection offered by water-filled polymer foam depends on the intensity of the blast load and the thickness of the foam protection. It is found from the experimental data that with 50 mm as well as 100 mm thick water-filled foam protection, there is a reduction in plate midpoint deflection up to 49%. It is further observed that with 50 mm thick protective cover, depending on the intensity of the blast load, there is enhancement of damage to the structure in some of the experiments.Numerical simulations of the blast-protection experiments with fluid-filled foam indicate that the momentum transfer from the blast wave to the foam and water is the principal mechanism of blast protective action by fluid (water)-filled foam, that results in energy dissipation as increase in kinetic energy of water present in the foam, work done in expelling the water from the foam and atomization of water into fine droplets, increase in strain energy of the foam and energy expenditure in disintegrating and dispersing the foam.
5
Dahnke, Michael. "»Wer konkurriert womit worum?« Ein neues Literaturpreis-Modell". Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-877C-D.
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Literaturpreise sind ein Phänomen des 20. Jahrhunderts. Ihre Zahl ist im deutschsprachigen Raum in den letzten Jahrzehnten deutlich gestiegen. Die im Rahmen dieser Arbeit über mehrere Jahre erfolgte Forschung hat gezeigt, dass für ein umfassendes Verständnis dieser Art Preise zwingend weitere Akteure in den Blick zu nehmen sind. Neben den Vertretern Preise vergebender Organisationen, den Autoren und Geldgebern sind das die Juroren, die Repräsentanten der Verlage einschließlich weiterer Literatur vermarktender Unternehmen sowie die ›reinen‹ Leser.
In der Dissertation werden literarische Auszeichnungen zunächst innerhalb der literaturwissenschaftlichen Forschung verortet. Dafür werden sie aus drei verschiedenen Blickwinkeln vorgestellt: einem historischen, einem kontextuellen und einem begrifflichen. Anschließend wird die bisherige Forschung zu Literaturpreisen vorgestellt und das Potential des bisher einzigen Modells deutschsprachiger Literaturpreise gewürdigt. Der neue Ansatz besteht aus drei Komponenten: erstens einer theoretischen Modellierung der genannten sechs Arten von Akteuren. Diese werden als über bestimmte Möglichkeiten verfügende ›Konkurrenten‹ betrachtet, die sich um für sie spezifische ›Konkurrenzobjekte‹ bemühen. Die zweite Komponente ist die diachrone und asynchrone Beschreibung literarischer Auszeichnungen. So können mehrere, zeitlich einander folgende Verleihungen einer Auszeichnung genauso wie gleichzeitig stattfindende Vergaben verschiedener Preise sowie die dabei erfolgenden Handlungen der einzelnen Akteure theoriegeleitet zueinander in Beziehung gesetzt und analysiert werden. Die dritte Komponente ist Bourdieus ›literarisches Feld‹. Es wird als für diese Akteure zentraler Bereich vorausgesetzt.
Die Vorzüge der diachronen Betrachtung werden unter anderem mit zwei für die Geschichte des Bremer Literaturpreises wichtigen Konflikten der Jahre 1959/60 und 1979/80 belegt. Auch der Streit um die Verwendung des Namens ›Thomas Mann‹ für zwei verschiedene literarische Auszeichnungen in den Jahren 2008 und 2009 zeigt deutlich: Das für Literaturpreise relevante Geschehen spielt sich keineswegs nur jeweils zwischen den Vertretern einer einen Preis vergebenden Organisation und einem oder mehreren Autoren ab. Darum müssen auch Konflikte zwischen den Mitgliedern mehrerer Preise vergebender Organisationen theoretisch modellierbar sein. Weiter werden mit dem Modell Erklärungen dafür angeboten, warum nicht immer alle Auszeichnungen die von den Gründern gewünschten Wirkungen erzielen. Schließlich gilt der Finanzierbarkeit von Literaturpreisen ein besonderes Augenmerk.
Bei der Forschung für die vorliegende Arbeit wurden fast ausschließlich Quellen zu Preise verleihenden Organisationen benutzt. Nach deren systematischer Auswertung ist klar geworden, welche Objekte und Mittel für die Vertreter der einzelnen Konkurrentengruppen überhaupt in Frage kommen. Die Kenntnisse über die verschiedenen Arten Konkurrenten sind möglicherweise noch deutlich erweiterbar, wenn darüber hinausreichende Quellen zu Autoren, Juroren und Verlagsrepräsentanten sowie die anderer Literatur vermarktender Unternehmen hinzu gezogen würden. Dafür werden am Ende der Arbeit Vorschläge unterbreitet.
Książki na temat "AUTODYN Model"
1
Artkämper, Heiko, i Horst Clages, red. Kriminalistik gestern-heute-morgen. Richard Boorberg Verlag GmbH & Co KG, 2014. http://dx.doi.org/10.5771/9783415052307.
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10 Jahre im Dienst der Kriminalistik Bereits seit 10 Jahren ist die "Deutsche Gesellschaft für Kriminalistik (DGfK)" ein Garant für wissenschaftliche Arbeit und Weiterbildung. Die Herausgeber und Autoren würdigen die DGfK mit dem Jubiläumsband "Kriminalistik - gestern - heute - morgen". Die Beiträge der zahlreichen renommierten Verfasser sind praxisbezogen und grundlagenerläuternd. Aktuelle Themen - Die Zusammenarbeit zwischen Polizei und Privatermittlern in Deutschland - Die forensische Hypnose im Strafverfahren: Möglichkeiten und (rechtliche) Grenzen - Der Sam-Sheppard-Fall und seine Bedeutung für die Blutspurenmusteranalyse - Meta- und Cybercrime: Quo Vadis? - Die Kriminalistische Wabenanalyse - Neonatizid - Wenn Mütter ihre Kinder töten - Face Truth Model: Methoden der Wahrheitsfindung - alte/neue Verfahren - Kriminalistische Informationsbewertung - Forensische Handschriftenuntersuchung - Mantrailing: Wunderwaffe der Kriminalistik oder Wünschelrutengehen für Ermittler? Über die Reihe Mit Band 4 wurde das bisherige Konzept der Darstellung sehr spezifischer Einzelthemen umgestellt. Die Bände der Schriftenreihe enthalten nun Sammlungen verschiedener aktueller Themen, die die komplexe Bandbreite der Kriminalistik wiedergeben.
2
Gottsmann, Andreas, red. Die Habsburgermonarchie 1848-1918 Band X, Das kulturelle Leben Akteure-Tendenzen-Ausprägungen. Verlag der Österreichischen Akademie der Wissenschaften, 2021. http://dx.doi.org/10.1553/978oeaw86618.
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Das Nebeneinander von Unterschieden und Gemeinsamkeiten prägte die Donaumonarchie über Jahrhunderte, im kulturellen Leben wird dies besonders deutlich. Die Vermischung kultureller Codes und Symbole zeigt sich bis heute in Architektur, Musik und Kulinarik. Gleichzeitig wurde um 1900 ein zunehmender Nationalisierungsdruck spürbar, der sich im Nebeneinander kultureller Entwicklungen, im Wettbewerb, aber auch in gegenseitiger Ignoranz und Konfrontation äußerte. In zwei Bänden werden in 50 umfangreichen Beiträgen von österreichischen und internationalen Autorinnen und Autoren die unterschiedlichen Aspekte dieser Thematik erarbeitet: die staatliche und dynastische Kulturpolitik, der kulturelle Input durch Bildung und Religion sowie der kulturelle Output in Malerei, Architektur, Musik, Literatur, Theater und in der Rechtskultur. Auch den unterschiedlichen Ausdrucksformen einer sich in der rasanten gesellschaftlichen Dynamik wandelnden Alltagskultur der Lebensformen, der Wohnkultur und der Mode wird im Werk breiter Raum gegeben, abgerundet durch einen historiographischen Essay zur Kultur der Jahrhundertwende.
3
Lepsius, Susanne, Mario Ascheri, Emanuele Conte, Gero Dolezalek, Horst Enzensberger, Bernd Kannowski, Susanne Lepsius i in. Juristische Glossierungstechniken als Mittel rechtswissenschaftlicher Rationalisierungen. Erich Schmidt Verlag GmbH & Co. KG, 2022. http://dx.doi.org/10.37307/b.978-3-503-20935-4.
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Rechtstexte zu glossieren und zu kommentieren steht am Anfang der europäischen Rechtswissenschaft. Wie die Beiträge dieses Bandes zeigen, wurde diese rechtswissenschaftliche Methode nicht nur in Form der Standardglossen zum römischen und kanonischen Recht entwickelt, sondern auch von Rechtspraktikern erfolgreich auf die neuen regionalen Gesetzbücher und einheimische Rechtssammlungen in ganz Europa angewendet. Selbst in der Universitätsstadt Bologna war nicht ausgemacht, dass sich ausgerechnet die Glosse des Accursius als ‚glossa ordinaria‘ zum römischen Recht durchsetzen würde. In diesem Band werden Glossen im europäischen Zuschnitt behandelt. Während die Formen der Glossen weithin dem Bologneser Modell entsprachen, unterschieden sich die Erkenntnisinteressen, der Argumentationsstil, aber auch die Adressaten sonstiger Glossen deutlich von Standardglossen nach Bologneser Vorbild. Die Autorinnen und Autoren reflektieren anhand der behandelten unterschiedlichen juristischen Glossen die historiographischen Prämissen, die zur Gleichsetzung der europäischen Rechtswissenschaft mit den Bologneser Glossenapparaten führten. Sie erörtern auch, wie man juristische Glossen mit heutigen Methoden erschließen und edieren kann.
4
Rodrigues-Moura, Enrique, red. Letras na América Portuguesa : autores – textos – leitores. University of Bamberg Press, 2021. http://dx.doi.org/10.20378/irb-50063.
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Os textos produzidos na denominada América Portuguesa (1500-1822) abrangem os mais variados campos das letras ocidentais – lírica, épica, dramaturgia, historiografia, epistolografia, parenética, lexicografia, etc. – e seguem um modelo retórico-poético e teológico-político comum, próprio das Letras do Ancien Régime. Manuscritos e impressos escritos em várias línguas (português, principalmente, mas também em latim, castelhano, francês, italiano, tupi-guarani, língua geral, etc.), por um número de autores considerável (Pero Vaz de Caminha, José de Anchieta, Antônio Vieira, Francisco Manuel de Melo, Gregório de Matos, Manoel Botelho de Oliveira, Sebastião da Rocha Pita, Basílio da Gama, Antônio da Costa Peixoto, Francisco Alves de Sousa, etc.), corriam com avidez entre os leitores. São justamente esses textos, esses autores e esses leitores os que conformam o sistema cultural das Letras na América Portuguesa. A historiografia brasileira, portuguesa e inclusive internacional tem se debruçado há já vários decênios no estudo dos Estados do Brasil e do Maranhão e Grão-Pará, tanto de um ponto de vista micro-histórico como macro-histórico, salientando-se nos últimos tempos a sua relação com o resto do mundo, no âmbito próprio da global history. Nos últimos decênios, ao mesmo tempo, a literatura vem perdendo, paulatinamente, o seu poder de conhecimento legitimador das elites culturais de uma nação. Esse esquecido «Parnaso Brasileiro» mantinha, no entanto, um fluido diálogo cultural com Lisboa assim como com outras cidades europeias, diálogo esse que os processos de formação das literaturas exclusivamente nacionais, brasileira e/ou portuguesa, vieram apagar ou até mesmo ignorar. No espaço hermenêutico próprio dos Atlantic Studies, recuperam-se, neste livro, as Letras escritas e lidas na América Portuguesa, estudam-se seus autores, interpretam-se textos escolhidos e indaga-se tanto sobre seus primeiros leitores, como sobre seus leitores de ontem e de hoje. Um conjunto de docentes do Brasil, de Portugal, da Alemanha e da Espanha discute textos de Vaz de Caminha, Ambrósio Fernandes Brandão, Antônio Vieira, Botelho de Oliveira, Basílio da Gama, Antônio da Costa Peixoto e Santa Rita Durão, entre outros. Die in der sogenannten »América Portuguesa« (1500-1822) entstandenen Texte gehören zu verschiedensten Diskursformen der westlichen Literatur und Kultur: Lyrik, Epik, Dramaturgie, Historiographie, Epistolographie, Homiletik, Lexikographie usw. Sie folgen einem gemeinsamen rhetorisch-poetischen und theologisch-politischen Modell, das charakteristisch für die Texte des Ancien Régime war. Manuskripte und Drucke in verschiedenen Sprachen (hauptsächlich Portugiesisch, aber auch Latein, Spanisch, Französisch, Italienisch, Tupi-Guarani, Língua Geral etc.) von einer beachtlichen Anzahl von Autoren (Pero Vaz de Caminha, José de Anchieta, Antônio Vieira, Francisco Manuel de Melo, Gregório de Matos, Manoel Botelho de Oliveira, Sebastião da Rocha Pita, Basílio da Gama, Antônio da Costa Peixoto, Francisco Alves de Sousa usw.) fanden eine umfassende Leserschaft. All diese Elemente - Texte, Autoren und Leserschaft – bilden das System der »Letras« in der »América Portuguesa«. Die brasilianische, portugiesische und sogar die internationale Geschichtsschreibung konzentriert sich seit mehreren Jahrzehnten auf das Studium der Kolonialstaaten Brasil und Maranhão e Grão-Pará sowohl aus mikro- als auch aus makrohistorischer Sicht. Gleichzeitig verliert die Literatur in den letzten Jahrzehnten allmählich die Funktion, das Wissen der kulturellen Eliten einer Nation zu legitimieren. Der aktuell wenig beachtete »Parnaso Brasileiro« unterhielt einen intensiven kulturellen Dialog mit Lissabon wie auch mit anderen europäischen Städten, einen Dialog, der der Ausbildung ausschließlich nationaler Literaturen, brasilianischer und/oder portugiesischer, wenig Stellenwert einräumte oder sie sogar ignorierte. Im hermeneutischen Raum, den die Atlantic Studies eröffnen, erschließt dieses Buch die in der »América Portuguesa« geschriebenen und gelesenen Texte, beschäftigt sich mit ihren Autoren, interpretiert ausgewählte Texte und fragt nach ihren ersten Lesern sowie nach ihren Leserinnen und Lesern gestern und heute. Eine Gruppe von Wissenschaftlerinnen und Wissenschaftlern aus Brasilien, Portugal, Deutschland und Spanien diskutiert Texte u.a. von Vaz de Caminha, Ambrósio Fernandes Brandão, Antônio Vieira, Botelho de Oliveira, Basílio da Gama, Antônio da Costa Peixoto und Santa Rita Durão. The texts produced in the so-called “América Portuguesa” (1500-1822) cover the most varied fields of Western Literature and Culture – lyric, epic, dramaturgy, historiography, epistolography, homiletics, lexicography, etc. – and follow a common rhetorical-poetic and theological-political model, typical for the Ancien Régime. Manuscripts and prints were written in various languages (Portuguese, mainly, but also Latin, Spanish, French, Italian, Tupi-Guarani, Língua Geral, etc.), by a considerable number of authors (Pero Vaz de Caminha, José de Anchieta, Antônio Vieira, Francisco Manuel de Melo, Gregório de Matos, Manoel Botelho de Oliveira, Sebastião da Rocha Pita, Basílio da Gama, Antônio da Costa Peixoto, Francisco Alves de Sousa, etc.) found a broad reception by readers. Precisely, these texts, these authors and these readers constituted the literary system in the “América Portuguesa”. Brazilian, Portuguese, and even international historiography has focused for several decades on the study of the colonial states Brasil and Maranhão e Grão-Pará, both from a micro-historical and macro-historical point of view, emphasizing recently their relationship with the rest of the world in the context of global history. Currently, literature is gradually losing its power of legitimising knowledge of the cultural elites of a nation. This forgotten “Parnaso Brasileiro” maintained, however, a fluid cultural dialogue with Lisbon as well as with other European cities, a dialogue that the formation of exclusively national literatures, Brazilian and/or Portuguese, came to neglect or even ignore. In the hermeneutic space opened up by the Atlantic Studies, this book deals with texts written and read in the “América Portuguesa”, studies its authors, interprets selected works and inquires both about its first readers and about its readers yesterday and today. A group of scholars from Brazil, Portugal, Germany and Spain discusses texts by Vaz de Caminha, Ambrósio Fernandes Brandão, Antônio Vieira, Botelho de Oliveira, Basílio da Gama, Antônio da Costa Peixoto and Santa Rita Durão, among others.
5
Hasenberg, Peter, Markus Leninger i Reinhold Zwick, red. Familienbilder. Schüren Verlag, 2018. http://dx.doi.org/10.5771/9783741001284.
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Das klassische, aus dem 19. Jahrhundert tradierte und oft – nicht zuletzt von der Kirche – idealisierte Bild der Familie ist in der Moderne zunehmend fragwürdig geworden. Väter haben ihre Bedeutung als Alleinernährer verloren, Frauen sehen ihre Erfüllung nicht mehr allein in der Sorge für Ehemann und Kinder, die Ehe als einziges Modell gelebter Zweisamkeit hat Konkurrenz durch alternative Familienkonstellationen bekommen. Es gibt nicht mehr «die Familie», sondern zahlreiche Familienbilder und eine Vielfalt an Modellen des Zusammenlebens. Die aktuelle, von der Pluralisierung der Lebensformen gekennzeichnete Situation und die Unübersichtlichkeit der Lage ist auch eine Anfrage an die Familienpastoral. Wie und ob die Kirche neue Antworten vor diesem Hintergrund findet, war zuletzt auch Gegenstand zweier von Papst Franziskus einberufenen Bischofssynoden, die in dem päpstlichen Lehrschreiben Amoris Laetitia ihren Niederschlag fanden. Der vorliegende Band nähert sich dem Wandel der Familien im Spiegel von aktuellen Film- und Fernsehproduktionen. Zum einen geht es darum, wie Filme von «realistischen» Familien erzählen – im Alltag, aber auch in Extremsituationen, Krisen und Konflikten, zum anderen werden in den Figuren auch Idealvorstellungen von Familie und Lebensglück artikuliert. Im ersten Teil werden allgemeine Überlegungen zu Entwicklungsprozessen und Konflikten in der Familie aus psychologischer Sicht und zum spezifischen Wandel der Familienwerte entfaltet. Der Hauptteil konzentriert sich auf die Analyse einzelner Filme: HÖHERE GEWALT von Ruben Östlund, ELTERN von Robert Thalheim, DIE FRAU DES POLIZISTEN von Philip Gröning oder SCHWESTERN von Anne Wild, wobei zu den beiden letzten Filmen ausführliche Interviews mit dem Regisseur bzw. der Regisseurin geboten werden. In populären TV-Serien wird das Familienthema in Bezug auf die Gegenwart in der TV-Soap GUTE ZEITEN, SCHLECHTE ZEITEN und in historischer Perspektive in der populären britischen Serie DOWNTON ABBEY untersucht. Ein spezieller Blick wird auf Familien in Kurzfilmen geworfen. Überlegungen zur Bedeutung des Films für die pastorale Arbeit der Kirche runden das Themenspektrum ab. Autoren des Bandes sind: Hans Zollner, Christoph Neumaier, Ulrike Vollmer, Reinhold Zwick, Peter Hasenberg, Markus Leniger, Franz Günther Weyrich, Stefan Leisten und Stefan Orth.
Części książek na temat "AUTODYN Model"
1
Braun, C., i M. Bauer. "Autogen vaskularisierte allogene Knochentransplantate — Tierexperimentelles Modell zu einem neuen Muskel-Knochen-composite-graft". W Mikrochirurgische Rekonstruktion nach Trauma, 63–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-77017-3_9.
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"Die Autoren". W Das Inverted Classroom Model, XV—XVI. Oldenbourg Wissenschaftsverlag, 2017. http://dx.doi.org/10.1515/9783486716641-003.
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"Autorinnen und Autoren". W Modell und Wirklichkeit, 531–36. Verlag Ferdinand Schöningh, 2008. http://dx.doi.org/10.30965/9783657757473_042.
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"Autorinnen und Autoren". W Das materielle Modell, 327–33. Wilhelm Fink Verlag, 2014. http://dx.doi.org/10.30965/9783846756966_035.
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"Autorinnen und Autoren". W Räume der Mode, 289–93. Wilhelm Fink Verlag, 2012. http://dx.doi.org/10.30965/9783846752005_020.
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"Autorinnen und Autoren". W Die Medialität der Mode, 405–11. transcript-Verlag, 2015. http://dx.doi.org/10.14361/9783839425596-020.
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"Autorinnen und Autoren". W Die Medialität der Mode, 405–11. transcript Verlag, 2015. http://dx.doi.org/10.1515/9783839425596-020.
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"Autorinnen und Autoren". W Antike als Modell in Nordamerika?, redaktorzy Ulrich Niggemann i Kai Ruffing, 306. Berlin, Boston: De Gruyter Oldenbourg, 2011. http://dx.doi.org/10.1515/9783110650846-017.
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"Verzeichnis der Autoren". W Wirtschaftslehre zwischen Modell und Realität, redaktorzy Rolf Hüpen i Thomas Werbeck. Berlin, Boston: De Gruyter, 1998. http://dx.doi.org/10.1515/9783110504545-018.
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"Autorinnen, Autoren und Mitarbeiterinnen". W Die Wissenschaften der Mode, 219–21. transcript-Verlag, 2015. http://dx.doi.org/10.14361/9783839422007-011.
Pełny tekst źródłaStreszczenia konferencji na temat "AUTODYN Model"
1
Fikus, B., i J. Michalski. "ASSESSMENT OF APPLICABILITY OF ANSYS AUTODYN POWDER BURN MATERIAL MODEL TO COMBUSTION CALCULATIONS IN CONDITIONS OF INTERNAL BALLISTICS". W 8TH INTERNATIONAL SYMPOSIUM ON NONEQUILIBRIUM PROCESSES, PLASMA, COMBUSTION, AND ATMOSPHERIC PHENOMENA. TORUS PRESS, 2020. http://dx.doi.org/10.30826/nepcap2018-2-23.
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The paper presents the results of evaluation of the possibility of numerical modeling of combustion in conditions of interior ballistics using the Powder Burn material model available in AUTODYN software. In order to obtain the reference data which allows for error estimation, the self-developed algorithm is applied. Analyses are conducted for constant volume (closed vessel) and dynamic (piston propulsion problem) conditions. During the simulations, experimentally obtained input data available in the literature are applied. On the one hand, compatibility of the compared maximal values of pressure is found. On the other hand, the rise time for the AUTODYN model is much shorter. For the dynamic case, revealed differences in both parameters are significant. The possible reasons of the obtained discrepancy are the unphysical form of the equation of state of gases and different ways of calculating the burning process implemented into AUTODYN software, which should be corrected by the software developer.
2
Berg, Vanessa S., Dale S. Preece, Jerome H. Stofleth i Mathew A. Risenmay. "Kevlar and Carbon Composite Body Armor: Analysis and Testing". W ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71433.
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Kevlar materials make excellent body armor due to their fabric-like flexibility and ultra-high tensile strength. Carbon composites are made up from many layers of carbon AS-4 material impregnated with epoxy. Fiber orientation is bidirectional, orientated at 0° and 90°. They also have ultra-high tensile strength but can be made into relatively hard armor pieces. Once many layers are cut and assembled they can be ergonomicically shaped in a mold during the heated curing process. Kevlar and carbon composites can be used together to produce light and effective body armor. This paper will focus on computer analysis and laboratory testing of a Kevlar/carbon composite cross-section proposed for body armor development. The carbon composite is inserted between layers of Kevlar. The computer analysis was performed with a Lagrangian transversely isotropic material model for both the Kevlar and Carbon Composite. The computer code employed is AUTODYN. Both the computer analysis and laboratory testing utilized different fragments sizes of hardened steel impacting on the armor cross-section. The steel fragments are right-circular cylinders. Laboratory testing was undertaken by firing various sizes of hardened steel fragments at square test coupons of Kevlar layers and heat cured carbon composites. The V50 velocity for the various fragment sizes was determined from the testing. This V50 data can be used to compare the body armor design with other previously designed armor systems. AUTODYN [1] computer simulations of the fragment impacts were compared to the experimental results and used to evaluate and guide the overall design process. This paper will include the detailed transversely isotropic computer simulations of the Kevlar/carbon composite cross-section as well as the experimental results and a comparison between the two. Conclusions will be drawn about the design process and the validity of current computer modeling methods for Kevlar and carbon composites.
3
Kong, Xiangshao, Weiguo Wu, Xiaobian Li, Shuangxi Xu, Yuanzhou Zheng i Yanlin Huang. "Experimental Study and Numerical Simulation on Slamming of High-Speed Trimaran". W ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20272.
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The study on slamming of high speed trimaran is a very complicated and significant topic. Ship slamming is a nonlinear unsteady problem in which dynamic boundary and coupling among structure, air and water should be considered. It is a key issue in the ship research field. Unlike the slamming of ordinary monohull, trimaran slamming include not only main hull bottom slamming, but also slamming of trimaran cross structure, which makes trimaran slamming more complicated. In this paper, a reduced scale model of trimaran was constructed and an experiment was carried out in order to study the slamming pressure distribution on main hull and cross structure. By using nonlinear simulation software Autodyn, a finite element model was established to simulate the process that trimaran model enters into water. The accuracy and reliability of numerical simulation is validated by comparing experimental data and numerical simulation results. Furthermore, some valuable conclusions on trimaran slamming are obtained.
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Ziadat, John, i Karim H. Muci-Küchler. "Development of a Computational Model to Visualize Air Flow Into Surrogate Ballistic Wounds". W ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70650.
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In addition to the direct mechanical damage that takes place during a ballistic injury, the formation of the temporary wound cavity creates a suction effect capable of introducing debris, particles, and bacteria from the environment into the wound track. This introduction of bacterial contamination into the wound can give rise to infections which may delay healing or result in more serious problems. Various authors have conducted controlled ballistics experiments placing bacterial contamination on the surface of ballistics gelatin targets to study the effect of parameters such as projectile caliber and speed on the distribution of bacteria along the permanent cavity. The results reported in the literature showed that bacteria were present along the entire surrogate wound track. Understanding the contribution that the formation of the temporary cavity has on the number and distribution of bacteria along the surrogate wound requires the development of experiments to visualize the flow of air during the transient phase of target deformation and the use of numerical simulations to predict variables associated with the flow of air, like pressure-time histories along the projectile path, that cannot be directly measured during experiments. This paper discusses the development of a finite element model using ANSYS Autodyn for the simulation of a small caliber projectile traveling at moderate speeds penetrating a soft tissue surrogate target made of ballistics gelatin. The model uses a Coupled Eulerian-Lagrangian formulation and discretization scheme, which allows for the analysis of not only the deformation of the solid bodies, but also of the flow of air into the wound track. For model validation, the numerical results are compared to spatial data extracted from high speed video recorded during experiments matching key model parameters. Comparisons of the numerical and experimental results indicate that the model is providing reasonable results for the deformations and overall air flow. The predicted pressure dynamics within the simulated wound track clearly suggest that areas of partial vacuum exist within the cavity, which is consistent with the suction effect mentioned by several researchers.
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Zhan, Guodong David, Jianhui Xu, Abdulwahab Aljohar i Huijuan Guo. "Numerical Simulation of Effects of Shock Waves on the Integrity of Cement Sheath". W International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-21972-ms.
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Abstract With the application of electrical explosion technology in the oil industry, such as plugging removal, wax removal and micro-cracks generation near the wellbore zone, the impact of shock wave generated by the electrical explosion on cement sheath cannot be ignored. To study the effect of electrical explosion downhole application on the integrity of cement sheath during the operation, a numerical simulation was used. A composite model of casing-cement sheath-rock is established in AUTODYN. The propagation process of shock waves in the composite and the damage to cement sheath are studied. The results show that the shock wave propagates through the perforation hole in the liquid and keeps a high pressure in the perforated area. In the nonperforated area, the shock wave decays greatly after passing through the casing pipe. When the cement sheath and rock are subjected to the shock waves, the damage area extends outward from the perforation hole. The cement sheath and rock are mainly subjected to the tensile and shear damage by the shock waves. What is more, the casing deformation caused by shock waves may also contribute to the damage of cement sheath behind the casing.
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Noskov, V. Ya, K. A. Ignatkov, A. P. Chupahin, G. P. Ermak i A. S. Vasyliev. "Mathematical model of FM autodyne radar". W 2016 9th International Kharkiv Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves (MSMW). IEEE, 2016. http://dx.doi.org/10.1109/msmw.2016.7538000.
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Noskov, V. Ya, K. A. Ignatkov, A. P. Chupahin, G. P. Ermak i A. S. Vasyliev. "Mathematical model of double-diode autodyne". W 2016 9th International Kharkiv Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves (MSMW). IEEE, 2016. http://dx.doi.org/10.1109/msmw.2016.7538101.
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Kawabata, Osamu. "Analyses of Ex-Vessel Steam Explosion and Its Structural Dynamic Response for a Typical PWR Plant". W 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49105.
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The present paper deals with analysis of an ex-vessel steam explosion and its structural dynamic response to confirm the integrity of a concrete structure simulating the reactor cavity compartment of the four loop PWR plant. The VESUVIUS code, which has been developed in the IMPACT project of NUPEC, was used for analysis of the molten-core coolant interaction phenomenon. The steam explosion model in VESUVIUS code contains break-up of melted jet, pre-mixing, and propagation of impulsion wave in the cavity water with a multiple-dimensional model. Initial conditions were determined based on the KROTOS steam explosion experiment performed at the JRC-Ispra in Italy. In a pre-mixing phase analysis, a melted jet entering into the water and the associated breakup phenomenon were analyzed with various water depths. The result showed that a spontaneous steam explosion was not predicted in the case of 3m water depth. However, a spontaneous steam explosion condition was onset in the case of 5m water depth. The results showed that the maximum pressure load to the cavity floor reached to 17MPa in the case of 5m water depth due to pressure propagation through fine fragmentation process. The conversion efficiency of mechanical energy was estimated to be about 2.9% in the compulsive triggering case with 5m water depth. The structural dynamic response analysis of ferroconcrete around the reactor vessel was performed by the AUTODYN-2D code, which is two-dimensional impact analysis code, applying analytical results obtained with the VESUVIUS code. The maximum value of the plasticity strain of concrete was estimated about 2.4%, and therefore calculated results indicated the possibility of local damage to the concrete structure. However, the re-bar remained in elastic region, and the integrity of a concrete structure was secured.
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Berg, Vanessa, Jerome H. Stofleth, Dale S. Preece i Venner Saul. "Analysis of Dynamic Loading of a Simple Structure to a Blast Wave". W ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1148.
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An object in the path of a blast wave generated by an explosion will experience a certain level of structural damage. The degree of destruction seen in a structure from a explosive blast wave is effected by three main parameters, (1) the force applied to the structure, (2) how long the force is acting on the structure, and (3) the specific geometric and material properties of the structure, or architectural surety. Structures capable of large lateral loads can be used for defense against explosions (terrorist threats). However, in order to fully predict the architectural surety of a structure, further investigation of the interaction of explosive blast waves with structures is required. The purpose of our analysis is to determine the efficiency of coupling energy from a blast wave to a simple structure. We performed some explosives tests and computer simulations to provide this analysis. In our experiments, the structures consisted of several free hanging steel plates at various distances from an explosion. The blast wave was generated by a sphere of TNT. We used a standard model to calculate the overpressure incident on this plates, we then calculated the shock energy coupled to the plates, we measured the overpressure at points near the plates (for calibration), we measured the effects of the blast wave on the plates (measured their displacement due to the blast), and we performed computer code calculations to predict the effect of the blast wave on the plates. The computational code Autodyn is currently being used at Sandia National Laboratories for various impact and blast loading problems. The code contains several simulation methods, including ALE (Arbitrary Langrangian Eulerian) simulation. Because explosive blast in air involves both expanding gases as well as solid/solid impacts, ALE codes typically provide better predictive capabilities.
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Kortunov, Vladimir, Alexandr Dmitriev, Alexsey Konovalov i Valerii Ulyanov. "IDENTIFICATION OF TUMOR TISSUES BY AUTODYNE METHOD". W NEW TECHNOLOGIES IN MEDICINE, BIOLOGY, PHARMACOLOGY AND ECOLOGY. Institute of information technology, 2021. http://dx.doi.org/10.47501/978-5-6044060-1-4.05.
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The results of study of laser evaporation of models of healthy and tumoral biological tissues by autodyne method are presented. It is shown the level of autodyne signal varies in different degrees depending on the type of healthy and tumoral biotissues at its laser evaporation.