Artykuły w czasopismach: „Blast loading on cylindrical tubes”

1

Li, H. J., C. J. Shen, G. Lu i Z. H. Wang. "Response of cylindrical tubes subjected to internal blast loading". Engineering Structures 272 (grudzień 2022): 115004. http://dx.doi.org/10.1016/j.engstruct.2022.115004.

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Li, Shiqiang, Boli Yu, Dora Karagiozova, Zhifang Liu, Guoxing Lu i Zhihua Wang. "Experimental, numerical, and theoretical studies of the response of short cylindrical stainless steel tubes under lateral air blast loading". International Journal of Impact Engineering 124 (luty 2019): 48–60. http://dx.doi.org/10.1016/j.ijimpeng.2018.10.004.

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Chen, Zhan-Feng, Hui-Jie Wang, Zhiqian Sang, Wen Wang, He Yang, Wei-Ming Meng i Yu-Xing Li. "Theoretical and Numerical Analysis of Blasting Pressure of Cylindrical Shells under Internal Explosive Loading". Journal of Marine Science and Engineering 9, nr 11 (19.11.2021): 1297. http://dx.doi.org/10.3390/jmse9111297.

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Cylindrical shells are principal structural elements that are used for many purposes, such as offshore, sub-marine, and airborne structures. The nonlinear mechanics model of internal blast loading was established to predict the dynamic blast pressure of cylindrical shells. However, due to the complexity of the nonlinear mechanical model, the solution process is time-consuming. In this study, the nonlinear mechanics model of internal blast loading is linearized, and the dynamic blast pressure of cylindrical shells is solved. First, a mechanical model of cylindrical shells subjected to internal blast loading is proposed. To simplify the calculation, the internal blast loading is reduced to linearly uniform variations. Second, according to the stress function method, the dynamic blast pressure equation of cylindrical shells subjected to blast loading is derived. Third, the calculated results are compared with those of the finite element method (FEM) under different durations of dynamic pressure pulse. Finally, to reduce the errors, the dynamic blast pressure equation is further optimized. The results demonstrate that the optimized equation is in good agreement with the FEM, and is feasible to linearize the internal blast loading of cylindrical shells.

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Goel, M. D., N. S. Choudhary i Sandeep Panchal. "Comparative Analysis of Aluminum Alloy 6061-T6 and Mild Steel Tubes in Sacrificial Protection System under Blast Loading". Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, nr 1 (19.12.2022): 1299–304. http://dx.doi.org/10.38208/acp.v1.654.

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A sacrificial cladding consist of hollow metal tubes and steel sheet, is proposed in this study to protect a square concrete panel subjected to blast loading. Herein, comparative analysis of aluminum alloy 6061-T6 (Al 6061-T6) and mild steel tubes in sacrificial cladding is done using 3-D non-linear Finite Element (FE) software ABAQUS/Explicit®. Blast load is applied through ConWep program developed by US Army. Simplified Concrete Damage Plasticity (SCDP) model is used to define the material behavior of concrete slabs of thickness 250 mm. Johnson-Cook (J-C) plasticity model is used to model the stress-strain response of Al 6061-T6 and mild steel tubes, reinforcement bars and steel sheet. Diameter (D) and thickness (t) of circular metal hollow tubes are taken from IS1161:1998. Comparative analysis of Al 6061-T6 and mild steel tubes is carried out for blast loading using TNT with scaled distance of 0.425 m/kg1/3. It was observed that mild steel tubes perform better than Al 6061-T6 tubes and save concrete panel from degradation under blast loading.

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Wang, Deng Wang, Xue Jun Qin, Shi Ying Tang i Wen Xiang Liu. "Dynamic Fracture of the 20# Cylindrical Steel Shell under Inside-Explosion Loading". Applied Mechanics and Materials 189 (lipiec 2012): 245–49. http://dx.doi.org/10.4028/www.scientific.net/amm.189.245.

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Dynamic fracture of explosion containment vessels subjected to internal blast loads is the foundation for conducting safety assessment and failure analysis of explosion containment vessels. The experiments were carried out to investigate dynamic fracture characteristics of cylindrical steel shells subjected to internal blast loadings at the centers. The elastic-plastic response of cylindrical steel shells was conducted using nonlinear dynamic finite element analysis code LS-DYNA. The fracture mode and fracture mechanism of a cylindrical shell were specially studied through analysis of deformation， macrographs of fracture surface and elastic-plastic response. The results show that dynamical ductility deformations appear and the shear bands form when the cylindrical steel shell expands under internal blast loading. The cylindrical steel shell fractures preferentially along the shear bands due to its softening effect. The fracture mechanism is that the shear bands tear under tensile circumferential stress. The shear bands and the tensile circumferential stress dominate the final fracture mode. The fracture mode is of the ductile fracture.

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Chen, Anqi, Luke A. Louca i Ahmed Y. Elghazouli. "Behaviour of cylindrical steel drums under blast loading conditions". International Journal of Impact Engineering 88 (luty 2016): 39–53. http://dx.doi.org/10.1016/j.ijimpeng.2015.09.007.

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Yaguang, Sui, Zhang Dezhi, Tang Shiying i Chen Bo. "Experimental and Numerical Research on Cylindrical Tubes under Outer Cylindrical Explosive Waves". Shock and Vibration 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/6150193.

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Cylindrical explosive loading has an important application in explosive working, researching on weapon damage, and explosive-driving load. This study uses experimental and numerical methods to study the response of long and thin tubes when subjected to cylindrical explosive loading. The flake-like charge and multipoint initiation technique were adopted to load cylindrical explosive waves. Experimental results showed that the method could produce uniform deformation in certain parts of the long tube, but partial spall injuries occurred after the explosion. The macroscopic and microscopic deformation of tubes were analyzed. Numerical simulations were conducted to investigate the detailed response of the tube subjected to a cylindrical explosive wave. The results indicate that the collision of explosive waves brought inconsistencies in pressure and velocity. The pressure and velocity in the collision region were significantly higher than those of other parts, which caused the collision region to be easily damaged.

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Cai, Jing Tao, Ting Tang i Jin Bo Ma. "Influence of Charges Shape on a Closely Air Blast Loading". Applied Mechanics and Materials 217-219 (listopad 2012): 1411–15. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1411.

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The purpose of the present paper is to investigate the influence of charge shape on the air blast loading near the explosive. By using MSC. DYTRAN, the air blast loading of spherical charge, cubical charge and cylindrical charge with the same weight were simulated. After the characters of shock wave, peak pressure and impulse of such three charges were compared, it can be seen that there are different decay law for peak pressure of cylindrical charge, cubical charge, spherical and experiment formula. There are also different magnitude relation for the impulse at different scaling distance.

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Wang, Deng Wang, Xue Jun Qin, Shi Ying Tang, Wen Xiang Liu i Hui Wang. "Investigations on Broken Rules of the 20# Cylindrical Steel Shell under Inside-Explosion Loading". Applied Mechanics and Materials 189 (lipiec 2012): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amm.189.239.

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Broken rules of cylindrical steel shell subjected to internal blast loads is the foundation for conducting safety assessment and failure analysis of explosion containment vessels. The experiments were carried out broken rules of the cylindrical steel shells subjected to internal blast loadings at the centers. The elastic-plastic response of cylindrical steel shells was conducted using nonlinear dynamic finite element analysis code LS-DYNA. The results show that the deformation was’t a discrepancy in the explosion center of the cylindrical steel shell in same space, and the deformation descended slower along with thickness augmentation in the end of explosion center. The radial stress、hoop stress and axial stress was a discrepancy in the thickness way of cylindrical steel shell of explosion center The most leading cause of destructivity of cylindrical steel shell was that inner wall bearing normal stress and exterior wall bearing tensile stress; the hoop stress was broken more than axial stress cylindrical steel shell. The whole process was presenting hoop fractured and axial growth.

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Held, Manfred. "Blast Effects of High Explosive Charges Detonating in Cylindrical Steel Tubes". Propellants, Explosives, Pyrotechnics 25, nr 6 (grudzień 2000): 307–11. http://dx.doi.org/10.1002/1521-4087(200012)25:6<307::aid-prep307>3.0.co;2-c.

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Ruiz, C., F. Salvatorelli-D'angelo i V. K. Thompson. "Elastic response of thin-wall cylindrical vessels to blast loading". Computers & Structures 32, nr 5 (styczeń 1989): 1061–72. http://dx.doi.org/10.1016/0045-7949(89)90408-2.

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Mohamed, G., C. Soutis, A. Hodzic, J. C. Craveur i S. Pormente. "Interaction of hybrid pressurised cylindrical structures subjected to blast loading". Plastics, Rubber and Composites 41, nr 2 (marzec 2012): 69–76. http://dx.doi.org/10.1179/1743289810y.0000000027.

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Clubley, Simon K. "Non-linear long duration blast loading of cylindrical shell structures". Engineering Structures 59 (luty 2014): 113–26. http://dx.doi.org/10.1016/j.engstruct.2013.10.030.

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Ganiga, Karthik N., Ibrahim Mahzeen, Mohammed Safan, Shaikh Fazil M U i Shilpa S. "Blast Analysis on In-Filled Steel Tube Columns". International Journal for Modern Trends in Science and Technology 6, nr 6 (10.06.2020): 50–53. http://dx.doi.org/10.46501/ijmtst060612.

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In recent years, a large number of studies have been carried out to investigate the behaviours of concrete filled double skin steel tube (CFDST) members due to its increasing popularity in the construction industry. This project aims to study on ultra-high performance concrete filled double-skin tubes subjected to blast loading with cross section being square for both inner and outer steel tubes using ANSYS software. It is evident that the proposed CFDST column was able to withstand a large blast load without failure so that it has the potential to be used in high-value buildings as well as critical infrastructures. The steel tubes and concrete work together well and integrity of steel concrete interface is maintained. Steel tubes in inner and outer can acts as permanent formwork and primary reinforcement. ANSYS results shows that the CFDA column can withstand applied blast load.

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Sauer, Gerhard. "Axisymmetric deformations of straight cylindrical tubes under shock wave loading". Forschung im Ingenieurwesen 72, nr 1 (19.01.2008): 29–37. http://dx.doi.org/10.1007/s10010-007-0065-5.

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Hu, Yongle, Qicheng Liu, Shuxin Bai i Hong Zhang. "Dynamic fracture characteristics of cylindrical steel shell under internal blast loading". International Journal of Materials and Structural Integrity 8, nr 4 (2014): 291. http://dx.doi.org/10.1504/ijmsi.2014.067116.

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Li, Q. M., i Norman Jones. "Blast loading of a “short” cylindrical shell with transverse shear effects". International Journal of Impact Engineering 16, nr 2 (kwiecień 1995): 331–53. http://dx.doi.org/10.1016/0734-743x(94)00044-w.

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Nguyen, Thuy-Tien N., David R. Sory, Harsh D. Amin, Sara M. Rankin i William G. Proud. "Platform development for primary blast injury studies". Trauma 21, nr 2 (15.05.2018): 141–46. http://dx.doi.org/10.1177/1460408618776035.

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Explosion-related injuries are currently the most commonly occurring wounds in modern conflicts. They are observed in both military and civilian theatres, with complex injury pathophysiologies. Primary blast injuries are the most frequently encountered critical injuries experienced by victims close to the explosion. They are caused by large and rapid pressure changes of the blast waves which produce a wide range of loading patterns resulting in varied injuries. Well-characterised experimental loading devices which can reproduce the real mechanical characteristics of blast loadings on biological specimens in in vivo, ex vivo, and in vitro models are essential in determining the injury mechanisms. This paper discusses the performance and application of platforms, including shock tubes, mechanical testing machines, drop-weight rigs, and split-Hopkinson pressure bar, with regards to the replication of primary blast.

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Li, X. L., H. X. Chen, J. F. Kou, Y. D. Song, C. Hu, H. J. Huang i D. Y. Gao. "Numerical simulation research on fragments formation of cylindrical cased charge based on SPH method". Journal of Physics: Conference Series 2478, nr 3 (1.06.2023): 032039. http://dx.doi.org/10.1088/1742-6596/2478/3/032039.

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Abstract In order to obtain the fracture and fragmentation of a cased charge under blast loading, the JWL equation of state of HMX-based PBX was fitted based on a cylinder test firstly, then the smooth particle hydrodynamics (SPH) method was used to perform a simulation of cased charge under interior blast loading, in the meantime, an blast test of cased charge was conducted. The results show that the parameters of JWL equation of state and the simulation method were reasonably. The simulated fragments velocities and calculated results from empirical formula agreed well with each other, the maximum error did not exceed 9.5%. Under the direct loading of the detonation wave, the fragments velocities increased to more than 1000m/s immediately within 5us, and then the fragments were continuously accelerated by detonation products and shock wave until the fragments reached the maximum velocities in the later 250us. Eventually, the shape of expansion contour of the casing tended to be ellipsoid. The method and results can provide references for the power design of the fragment warhead, as well as the protection design against the fragments.

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Mürk, Annely, i Jaan Lellep. "Asymmetric response of inelastic circular plates to blast loading". Acta et Commentationes Universitatis Tartuensis de Mathematica 26, nr 2 (28.11.2022): 293–303. http://dx.doi.org/10.12697/acutm.2022.26.21.

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The dynamic behaviour of clamped circular plates subjected to the concentrated blast loading is studied. The load is applied at a non-central point of the plate, non-axisymmetric deflections are taken into account. An approximate theoretical procedure developed earlier is applied for the evaluation of residual maximal deflections. The solution technique is based on the idea of equality of the power of the internal and external work, respectively. As it was shown earlier this concept leads to results which are close to exact ones in the case of axisymmetric loading of circular plates, also in the case of circular cylindrical shells.

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Qi, Ruixuan, Genevieve S. Langdon, Trevor J. Cloete i Steeve Chung Kim Yuen. "Deformation and damage characteristics of ball bearings under blast loading". EPJ Web of Conferences 250 (2021): 05008. http://dx.doi.org/10.1051/epjconf/202125005008.

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This paper presents the unique failure characteristics, such as fragmentation, internal cracks, general deformation and pitting, observed on a SS420C ball bearing from direct blast loading using a cylindrical PE-4 explosive. Axisymmetric simulations were performed to gain insights of the failure mechanisms. While additional work is needed to fully understand all characteristic found, valuable findings have been presented to explain some of the failures.

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Zhang, Bo, i Shunshan Feng. "A Numerical Study of Blast Resistance of Carbon Fiber Reinforced Aluminum Alloy Laminates". Applied Sciences 13, nr 8 (13.04.2023): 4906. http://dx.doi.org/10.3390/app13084906.

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In this study, the dynamic responses under blast loading of carbon fiber reinforced aluminum alloy laminates with different curvature radii, different numbers of layers, and different layer directions of carbon fiber under blast loading were compared numerically. The finite element models were built with ABAQUS/Explicit. To calibrate the numerical models, experiments on curved carbon fiber and curved aluminum alloy were modeled, and the numerical results showed good agreement with the experimental data. The calibrated numerical models were used to simulate the dynamic response of cylindrical panels subject to external explosion loading. The stiffness degradation coefficient was introduced to more accurately simulate the failure mode of the composite structures. The deformation and energy absorption of carbon fiber reinforced aluminum alloy laminates under different structural parameters were obtained. These simulation findings can guide the theoretical study and optimal design of carbon fiber reinforced structures subject to external blast loading.

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Redekop, D., i P. Azar. "Dynamic Response of a Cylindrical Shell Panel to Explosive Loading". Journal of Vibration and Acoustics 113, nr 3 (1.07.1991): 273–78. http://dx.doi.org/10.1115/1.2930181.

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The dynamic response of steel cylindrical shell panels subjected to external free-field air-blast loading is investigated. The cases of rectangular and square panels having hinged and immovable boundary conditions are considered. Approximate theoretical solutions are presented for linear and nonlinear geometric behavior. Numerical solutions are given for linear, nonlinear geometric and general nonlinear behavior. Results from the theoretical and numerical solutions are compared for several panel rise cases, and conclusions are drawn.

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Anas, S. M., Mehtab Alam i Md I. Ansari. "Effect of Carbon Steel Hollow Tubes as Reinforcement and Aluminum Foam as Shock Absorber on the Blast Response of One-way Concrete Slabs". Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, nr 1 (19.12.2022): 473–83. http://dx.doi.org/10.38208/acp.v1.537.

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To investigate the blast response of the one-way normal strength concrete slabs reinforced on both sides with the High Yield Strength Deformed (HYSD) steel re-bars under air-blast loading, finite element (FE) simulation models have been developed using the explicit non-linear finite element program, ABAQUS/CAE. FE simulation outcomes are found matching closely with the available experimental results and observations. Analyses have been further extended substituting the hollow square carbon steel seamless tubes of grade Fe330 of equivalent strength in place of the conventional steel re-bars of grade Fe600 on the tension side, impact side only, and both the sides of the slab. The substitution has been considered to enhance the blast response of the slab. The damage has been simulated using the concrete damaged plasticity (CDP) model to evaluate the geometric parameters of cracks. The substitution of the tubes on the tension side only is found more effective in reducing the mid-span deflection, damage, and depth of transverse flexural cracks. Efforts have also been made to investigate the effectiveness of the aluminum foam as a shock absorber against the given level of the blast load. The use of two layers of the foam sandwiched with a thin steel sheet on the impact side of the slab only improves further the performance of the slab subjected to air-blast loading.

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Soutis, C., G. Mohamed i A. Hodzic. "Performance of Glare panels subjected to intense pressure pulse loading". Aeronautical Journal 116, nr 1180 (czerwiec 2012): 667–79. http://dx.doi.org/10.1017/s0001924000007120.

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Abstract A robust and efficient computational model has been developed which is capable of modelling the dynamic non-linear behaviour of Glare panels subjected to blast loadings. High strain rate material characterisation and modelling of interfacial debonding between adjacent sublaminates have been taken into consideration. Numerical model validation have been performed considering case studies of Glare panels subjected to a blast-type pressure pulse for which experimental data on the back face- displacement and post-damage observations were available. Excellent agreement of mid-point deflections and evidence of severe yield line deformation were shown and discussed against the performed blast tests. A further parametric study identified Glare as a potential blast attenuating structure, exhibiting superior blast potential against monolithic aluminium plates. The results were normalised and showed that for a given impulse, Glare exhibited a smaller normalised displacement, outperforming monolithic Aluminium 2024-T3 plates. It was concluded that further work needed to be carried out to take into account the influence of geometry (cylindrical structures), pre-pressurisation effects and boundary conditions

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Qasrawi, Yazan, Pat J. Heffernan i Amir Fam. "Performance of Concrete-Filled FRP Tubes under Field Close-in Blast Loading". Journal of Composites for Construction 19, nr 4 (sierpień 2015): 04014067. http://dx.doi.org/10.1061/(asce)cc.1943-5614.0000502.

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Ritchie, Cameron B., Jeffrey A. Packer, Michael V. Seica i Xiao-Ling Zhao. "Flexural Behavior of Concrete-Filled Double-Skin Tubes Subject to Blast Loading". Journal of Structural Engineering 144, nr 7 (lipiec 2018): 04018076. http://dx.doi.org/10.1061/(asce)st.1943-541x.0002064.

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Jing, Lin, Zhi Hua Wang, Long Mao Zhao i V. P. W. Shim. "Blast Resistance of Clamped Cylindrical Sandwich Shells with Metallic Foam Cores". Key Engineering Materials 535-536 (styczeń 2013): 461–64. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.461.

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The deformation/failure modes and dynamic response of fully clamped cylindrical sandwich shells with aluminum foam cores subjected to air blast loading were investigated experimentally. A four-cable ballistic pendulum system was employed to measure the impulse imparted to the blast-loaded specimen. The deformation/failure modes of specimens were classified and analyzed, the effects of face-sheet thickness, core relative density, specimen curvature and mass of charge on the structural response of metallic sandwich shells were examined. Experimental results indicate that both the deformation/failure modes and the dynamic response of the sandwich shells are sensitive to the structural configurations and blast impulse. The experimental results are useful for validating theoretical predictions, as well as in engineering applications of cellular metal sandwich structures.

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Hoo Fatt, M. S. "Rigid-Plastic Deformation of a Ring-Stiffened Shell Under Blast Loading". Journal of Pressure Vessel Technology 119, nr 4 (1.11.1997): 467–74. http://dx.doi.org/10.1115/1.2842331.

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An approximate solution for the plastic deformation of a ring-stiffened cylindrical shell in response to a nonaxisymmetric, exponentially decaying pressure load, is presented. The analogy between the ring-stiffened cylindrical shell and a rigid-plastic string-on-foundation with discrete plastic resisting elements is used to find closed-form solutions for the transient and final deformations of the shell. Dynamic equilibrium of the central bay of the shell and the adjacent ring-stiffeners results in an inhomogeneous wave equation with inhomogeneous boundary conditions for the string. The initial-boundary value problem is solved by the method of eigenfunction expansion and a suitable orthogonality condition. The zeroth mode for the string describes rigid-body motion of the bay due to the remaining inertia of adjacent stiffeners. Permanent deformations are obtained using a plastic unloading criterion whereby the velocity and strain rate for each eigenmode vanish simultaneously. In the example problem, higher eigenmodes decay and vanish rapidly and final shell deformations are primarily governed by lower eigenmodes. The structural model gives qualitatively correct transient deflections and would be amenable to fine-tuning with numerical analysis and experimental evidence.

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Clubley, Simon K. "Long duration blast loading of cylindrical shell structures with variable fill level". Thin-Walled Structures 85 (grudzień 2014): 234–49. http://dx.doi.org/10.1016/j.tws.2014.08.021.

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Liu, X., W. B. Gu, J. Q. Liu, J. L. Xu, Y. H. Hu i Y. M. Hang. "Dynamic response of cylindrical explosion containment vessels subjected to internal blast loading". International Journal of Impact Engineering 135 (styczeń 2020): 103389. http://dx.doi.org/10.1016/j.ijimpeng.2019.103389.

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Gao, Fu Yin, Yuan Long, Chong Ji i Chang Xiao Zhang. "Research on Dynamic Response of Q235 Steel Cylindrical Shell Subjected to Lateral Explosion Loading". Advanced Materials Research 631-632 (styczeń 2013): 864–69. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.864.

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Experimental researches were presented on dynamic characteristics of Q235 steel cylindrical shell impacted-explosive laterally by 75g cylindrical TNT dynamite at the center．The dynamic response was obtained under different distances with different setting ways of explosive sources．By means of an explicit nonlinear dynamic finite element computer code LS-DYNA，the nonlinear dynamic response process of cylindrical shell subjected to laterally explosion loading were numerically simulated with ALE coupling method. The numerical simulation results were in good agreement with experimental data. The results provided important reference for the blast-resistant properties analysis and safety assessment of oil-gas pipes safety.

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HARUYAMA, Shigeyuki, Ken KAMINISHI, Dai-Heng CHEN i Hirokazu Iwamoto. "104 Deformation Modes Cylindrical Tubes with Corrugated Surface under Oblique Impact Loading". Proceedings of Conference of Chugoku-Shikoku Branch 2010.48 (2010): 7–8. http://dx.doi.org/10.1299/jsmecs.2010.48.7.

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McDonald, Brodie, Huon Bornstein, Ali Ameri, Juan P. Escobedo-Diaz i Adrian C. Orifici. "High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modelling". EPJ Web of Conferences 183 (2018): 01022. http://dx.doi.org/10.1051/epjconf/201818301022.

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Under ballistic impact or blast loading, the high strain rate and high temperature behaviour of armour steels is key to their response to a given threat. This experimental and numerical investigation examines the tensile response of a class 4a improved rolled homogenous armour steel (IRHA) and a high hardness armour steel (HHA). Cylindrical tensile specimens were tested at a range of strain rates from 0.001 s-1 to 2700 s-1. Quasi-static, elevated temperature tests were performed from room temperature up to 300° C. While the HHA is strain rate insensitive, the IRHA displays a significant increase in strength across the range of loading rates reducing the ultimate strength difference between the materials from 19% at 0.001s-1 to 4.6% at 2700s-1. An inverse numerical modelling approach for constitutive model calibration is presented, which accurately captured the dynamic material behaviour. The modified Johnson-Cook strength and Cockcroft-Latham (C-L) fracture models were capable of predicting the ballistic limit of each material to within 5% of the experimental result and to within 10% for deformation under blast loading. The blast rupture threshold of both materials was significantly over-estimated by the C-L model suggesting stress state or strain rate effects may be reducing the ductility of armour steel under localised blast loading.

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Dash, A. P., R. Velmurugan i M. S. R. Prasad. "Effect of Helical Winding Angle on External Pressure based Buckling of Partially Filled Thin Composite Cylindrical Shells". Defence Science Journal 69, nr 4 (15.07.2019): 313–19. http://dx.doi.org/10.14429/dsj.69.12634.

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Effect of helical winding angle on buckling load of thin composite tubes is investigated in this work. Experiments are conducted on both empty and partially filled S2 glass tubes to estimate contribution of strength to the tubes by the filler material. Chosen filler material mechanically simulates behavior of typical solid propellant used in aerospace application. FE analysis with non-linear effect correlates well with the experimental data. Three series of experiments are conducted to quantify effect of helical winding angle and increase in volumetric loading fraction(VLF). Results confirm appreciable improvement in strength of filled tubes for higher VLF. For the chosen pattern of winding, lower winding angle provides more strength to the tubes against external pressure buckling.

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Jing, Lin, Fei Yang, Zhihua Wang i Longmao Zhao. "A numerical simulation of metallic cylindrical sandwich shells subjected to air blast loading". Latin American Journal of Solids and Structures 10, nr 3 (maj 2013): 631–45. http://dx.doi.org/10.1590/s1679-78252013000300010.

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Abada, Mahmoud, Ahmed Ibrahim i S. J. Jung. "Improving Blast Performance of Reinforced Concrete Panels Using Sacrificial Cladding with Hybrid-Multi Cell Tubes". Modelling 2, nr 1 (7.03.2021): 149–65. http://dx.doi.org/10.3390/modelling2010008.

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The utilization of sacrificial layers to strengthen civilian structures against terrorist attacks is of great interest to engineering experts in structural retrofitting. The sacrificial cladding structures are designed to be attached to the façade of structures to absorb the impact of the explosion through the facing plate and the core layer progressive plastic deformation. Therefore, blast load striking the non-sacrificial structure could be attenuated. The idea of this study is to construct a sacrificial cladding structure from multicellular hybrid tubes to protect the prominent bearing members of civil engineering structures from blast hazard. The hybrid multi-cell tubes utilized in this study were out of staking composite layers (CFRP) around thin-walled tubes; single, double, and quadruple (AL) thin-walled tubes formed a hybrid single cell tube (H-SCT), a hybrid double cell tube (H-DCT), and a hybrid quadruple cell tube (H-QCT). An unprotected reinforced concrete (RC) panel under the impact of close-range free air blast detonation was selected to highlight the effectiveness of fortifying structural elements with sacrificial cladding layers. To investigate the proposed problem, Eulerian–Lagrangian coupled analyses were conducted using the explicit finite element program (Autodyn/ANSYS). The numerical models’ accuracy was validated with available blast testing data reported in the literature. Numerical simulations showed a decent agreement with the field blast test. The proposed cladding structures with different core topologies were applied to the unprotected RC slabs as an effective technique for blast loading mitigation. Mid-span deflection and damage patterns of the RC panels were used to evaluate the blast behavior of the structures. Cladding structure achieved a desired protection for the RC panel as the mid-span deflection decreased by 62%, 78%, and 87% for H-SCT, H-DCT, and H-QCT cores, respectively, compared to the unprotected panels. Additionally, the influence of the skin plate thickness on the behavior of the cladding structure was investigated.

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Dong, Jing, Junhai Zhao, Dongfang Zhang i Yingping Li. "Research on Dynamic Response of Concrete-Filled Steel Tube Columns Confined with FRP under Blast Loading". Shock and Vibration 2019 (10.07.2019): 1–18. http://dx.doi.org/10.1155/2019/8692310.

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Recently, a concrete-filled steel tube confined with fiber-reinforced polymer (FRP) has become a hot research issue as a new type of structure. These studies mainly focus on its static performance and seismic and impact behaviour, with little research on its blast resistance performance. In this study, the dynamic response of concrete-filled steel tube columns confined with FRP under blast loading was investigated. Numerical analysis was implemented using multimaterial ALE method in the finite element analysis program LS-DYNA. The proposed numerical model was validated by the SDOF result and available experimental data. And the effects of the number of FRP layers, concrete strength, and cross section were also discussed in detail based on the proposed numerical model. The results indicate that the constraints of FRP effectively enhance the blast resistance of the column, and the vulnerable parts mainly occur at the middle and two ends of the column. The blast resistance of the column can be enhanced by increasing the number of FRP layers or concrete strength. These results could provide a certain basis for blast resistance design of concrete-filled steel tubes confined with FRP.

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Alqwasmi, Nouman, Faris Tarlochan i Sami E. Alkhatib. "Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading". Materials 13, nr 3 (3.02.2020): 670. http://dx.doi.org/10.3390/ma13030670.

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Extensive research focus had been given to sacrificial sandwich panels to mitigate the effects of blast loads. This is due to their ability to distribute the load and absorb a significant portion of the blast energy. This paper studies the behavior of sacrificial sandwich mild steel panels of axially oriented octagonal tapered tubular cores subjected to near-field impulsive blast. The deformation behavior and several assessment parameters consisting of the peak force, stroke efficiency, energy absorption and core efficiency were investigated using validated finite element analysis. The developed deformation modes were mainly influenced by the top plate and tube thickness. Tubes of a 5° taper performed unfavorably, exhibiting increased peak force and lower energy absorption. Panels of top plate thickness of 4 mm exhibited higher stroke efficiency as compared to panels of lower thickness. The top plate and tube thickness significantly affected energy absorption. An increase of 73.5% in core efficiency was observed in thick-plate panels as compared to thin-plate ones.

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Niknejad, Abbas, Seyed Ghaem Amirhosseini i Nader Setoudeh. "Theoretical and experimental investigation of shaping process of circular metal tubes into triangular columns by the elastoforming method". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, nr 4 (8.08.2016): 658–74. http://dx.doi.org/10.1177/0954405415595915.

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In this article, a new manufacturing method is introduced to shape circular tubes into columns with triangular cross-section by the elastoforming process. Also, a theoretical analysis is performed to derive a theoretical formula for predicting total dissipated energy that is required for the forming process. For this purpose, V-shape dies with different angles are designed and some aluminum and brazen tubes with different characteristics are prepared. The circular tubes in the empty and filled conditions are compressed between a rigid V-shape die and a flat punch, and during the plastic deformation under the lateral loading, the tubes are shaped into the triangular sections. Considering different tube lengths, outer diameters and wall thicknesses, the specimens are categorized. Also, some of the samples are filled by cylindrical polyethylene Teflon with different thicknesses to investigate the effects of Teflon-filler on the shaping process of the triangular columns. The experiments show that using the cylindrical Teflon-filler, deformation mode of the triangular tubes improves, significantly. In addition, experimental observations of the deformation modes illustrate that there is an optimum value for wall thickness of cylindrical Teflon-filler and the tubes with the optimum Teflon-filler forms close to desirable triangular shape. The results show that by increasing tube wall thickness, probability of crack initiation and fracture reduces. Furthermore, comparison of estimations by the presented theory and the corresponding experimental measurements show an acceptable agreement, in both of empty and filled conditions.

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Qasrawi, Yazan, Pat J. Heffernan i Amir Fam. "Numerical Modeling of Concrete-Filled FRP Tubes’ Dynamic Behavior under Blast and Impact Loading". Journal of Structural Engineering 142, nr 2 (luty 2016): 04015106. http://dx.doi.org/10.1061/(asce)st.1943-541x.0001370.

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Chai, Gin Boay, i Guo Xing Lu. "Energy Absorption Capacity of Expanding Tube with Fiber-Reinforcement". Key Engineering Materials 626 (sierpień 2014): 57–61. http://dx.doi.org/10.4028/www.scientific.net/kem.626.57.

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Abstract. This contribution presents the investigation of energy absorption mechanism of metal tubes and composite-wrapped metal tubes subjected to a diametric deformation via an expansion process. In the experiments, the expansion of the tubes was performed under quasi-static loading using a conical-cylindrical expansion die. The experimental results are repeatable and thus reliable. An extensive finite element analyses and experimental investigation were carried out in parallel. Both two-dimensional and three-dimensional finite element models were created based on the actual experimental geometrical and material parameters. Results from the finite element analyses correlate rather well with the experimental data. Glass fibre-wrapped metal tubes showed an increased steady-state reaction force which in turn reflects better specific energy absorption capacity for every layer of composite wrapped as compared to bare metal tubes.

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Zhu, Wei, Guang-yan Huang, Chun-mei Liu i Shun-shan Feng. "Experimental and numerical investigation of a hollow cylindrical water barrier against internal blast loading". Engineering Structures 172 (październik 2018): 789–806. http://dx.doi.org/10.1016/j.engstruct.2018.06.062.

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Zhang, Pan, Yuansheng Cheng i Jun Liu. "Numerical Analysis of Dynamic Response of Corrugated Core Sandwich Panels Subjected to Near-Field Air Blast Loading". Shock and Vibration 2014 (2014): 1–16. http://dx.doi.org/10.1155/2014/180674.

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Three-dimensional fully coupled simulation is conducted to analyze the dynamic response of sandwich panels comprising equal thicknesses face sheets sandwiching a corrugated core when subjected to localized impulse created by the detonation of cylindrical explosive. A large number of computational cases have been calculated to comprehensively investigate the performance of sandwich panels under near-field air blast loading. Results show that the deformation/failure modes of panels depend strongly on stand-off distance. The beneficial FSI effect can be enhanced by decreasing the thickness of front face sheet. The core configuration has a negligible influence on the peak reflected pressure, but it has an effect on the deflection of a panel. It is found that the benefits of a sandwich panel over an equivalent weight solid plate to withstand near-field air blast loading are more evident at lower stand-off distance.

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45

Ghamarian, Ali, i Hamidreza Zarei. "Crashworthiness investigation of conical and cylindrical end-capped tubes under quasi-static crash loading". International Journal of Crashworthiness 17, nr 1 (luty 2012): 19–28. http://dx.doi.org/10.1080/13588265.2011.623025.

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Hadavi, Vahid, Jamal Zamani Ashani i Mohammad H. Benvidi. "Theoretical, experimental and numerical investigation on the behaviour of tubular shells under internal blast loading". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, nr 7 (7.11.2011): 1683–92. http://dx.doi.org/10.1177/0954406211427096.

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Explosive loading of closed cylindrical structures is one of the most complicated types of high rate loadings that can be applied on fully closed structure. Considering the complexities and unknown factors that affect the dynamic-plastic behaviour of a fully closed tubular shell under internal blast loading, the main objective of this article is to achieve a better understanding of the deformation of such a structure through different theoretical, empirical and also numerical approaches. Based on some simplifying assumptions, a new pressure–time profile for the internal explosive loading of cylindrical shells whose length is shorter than its diameter would be introduced in this manuscript. Afterwards, the fundamental equations of motion would be solved by the use of the aforementioned profile so that a practical formula for the calculation of maximum radial deformation of shell would be obtained. Comparison between the theoretical values and the results of the experimental tests conducted on several pieces of aluminium shells shows that the accuracy of the new theory is approximately 82%. Furthermore, this problem will be also modelled by the use of LS-DYNA module. Considering three separate meshing zones on the explosive charge, conveying medium and also the shell body which were connected to each other on overlapping surfaces, the numerical results for the maximum transverse displacement of the shell would be obtained from the software. Comparison between the finite element method and experimental results shows an average error of around 24%.

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Savchenko, V. I., N. N. Belash, Yevgeniy A. Krainyuk i Viktor N. Voyevodin. "Study of the Mechanical Properties of Shell of Fuel Elements from Zr1% Nb Alloys at Radial Stresses Similar to Reactor Conditions". 3, nr 3 (28.09.2021): 87–90. http://dx.doi.org/10.26565/10.26565/2312-4334-2021-3-13.

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When determining the mechanical properties of ring specimens, a feature of a uniaxial (standard) loading scheme is that the method of applying a load to a specimen is somewhat remote from that to which the pipe walls can be subject in real operating conditions, in particular, these are tubes of fuel element shells. As an alternative loading method, the method of strain of an ring specimen on a cylindrical rod was considered and tested. By compressing the cylindrical rod from the ends, which in this case expanded and exerted pressure on the inner walls of the ring specimen in the radial direction, the specimen was deformed. The plasticity of fuel element shells made of Zr-1%Nb alloy on ring specimens under different loading methods is evaluated: uniaxial tension on half-disk supports, on a cylindrical rod, and on a tapered rod. Uniaxial tensile strain was determined in accordance with the normative documentation for the test method. When testing on a tapered rod, a specimen with a thinned working part was used. For the proposed loading method, the radial strain was measured by the change in the sample diameter. The results of testing the samples on a cylindrical rod were compared with the previously obtained results on half-disc supports and a tapered rod. The method of deformation of a ring specimen on a cylindrical rod makes it possible to obtain higher values of plasticity in comparison with uniaxial tension. In addition, the proposed method of deformation of a sample on a cylindrical rod, in contrast to uniaxial tension, in terms of the nature of the stress state, approaches to the operating reactor conditions.

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Jailani, Azrol, Akhbar Othman i Siti Mariam Tajuddin. "Finite Element Modelling of Polymeric Foam-Filled Aluminium 2024-T4 Alloy Tube under Dynamic Axial Loading". Applied Mechanics and Materials 315 (kwiecień 2013): 45–50. http://dx.doi.org/10.4028/www.scientific.net/amm.315.45.

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The paper presents the numerical studies of two different tubes under axial impact loading structures. The cylindrical tubes filled with closed-cell polymeric foam. The deformation and failure mechanism of this new structure were observed and analyzed numerically using the finite element method. It is revealed that the stress distribution and fracture of the foam-filled tube structure are different from those of foam-filled tube. In comparison with double cell foam-filled tubes, the load-carrying capacity of this new structure is much steadier, the collapse behavior resistance is enhanced, and the weight efficiency of energy absorption is higher. Parameters affecting the performance of the foam-filled tube structures are also studied. Comparison were carried out with load versus displacement curve and also dynamic mean load as well as dynamic absorbed energy versus deformation of tubular collapse modeling failure mode using finite element analysis.

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Gunaydin, Kadir, Aykut Tamer, Halit Suleyman Turkmen, Giuseppe Sala i Antonio Mattia Grande. "Chiral-Lattice-Filled Composite Tubes under Uniaxial and Lateral Quasi-Static Load: Experimental Studies". Applied Sciences 11, nr 9 (21.04.2021): 3735. http://dx.doi.org/10.3390/app11093735.

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Our research investigated the energy absorption characteristics of chiral auxetic lattices filled cylindrical composite tubes subjected to a uniaxial and lateral quasi-static load. The lattice structures were manufactured using a 3D printing technique. Carbon fiber composite tubes without filler material were initially subjected to uniaxial and lateral quasi-static crushing load. The same types of experiment were then performed on chiral lattices and chiral lattices filled composite tubes. For the different cases, the load–displacements curves were analyzed and the specific energy absorption (SEA) values were compared. The SEA capability for the axial quasi-static crushing of the chiral lattices filled composite tubes decreased in comparison with the hollow composite design. However, the most significant result was that the average SEA value in the case of lateral loading increased dramatically in comparison with the hollow composite configuration.

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Whenhui, Zhu, Xue Honglu, Zhou Guangquan i G. K. Schleyer. "Dynamic response of cylindrical explosive chambers to internal blast loading produced by a concentrated charge". International Journal of Impact Engineering 19, nr 9-10 (październik 1997): 831–45. http://dx.doi.org/10.1016/s0734-743x(97)00022-5.

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