Bibliografie tematiche / Creep mechanism

Letteratura scientifica selezionata sul tema "Creep mechanism"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 19 febbraio 2022

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Articoli di riviste sul tema "Creep mechanism"

1

Shinya, Norio. "Creep fracture mechanism map." Bulletin of the Japan Institute of Metals 26, n. 8 (1987): 801–8. http://dx.doi.org/10.2320/materia1962.26.801.

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Li, J., e A. Dasgupta. "Failure-mechanism models for creep and creep rupture". IEEE Transactions on Reliability 42, n. 3 (1993): 339–53. http://dx.doi.org/10.1109/24.257816.

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3

Hou, Qing Yu, e Jing Tao Wang. "Deformation Mechanism in the Mg-Gd-Y Alloys Predicted by Deformation Mechanism Maps". Advanced Materials Research 146-147 (ottobre 2010): 225–32. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.225.

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Abstract (sommario):
Deformation mechanism maps at 0-883 K and shear strain rate of 10-10-10+6 s-1 were built from available rate equations for deformation mechanisms in pure magnesium or magnesium alloys. It can be found that the grain size has little effect on the fields of plasticity and phonon or electron drag, though it has important influence on the fields of power-law creep, diffusion creep, and Harper-Dorn creep in the maps within the present range of temperature, strain rate, and grain size. A larger grain size is helpful to increase the field range of power-law creep but decrease that of diffusion creep when the grain size is smaller than ~204 μm. Harper-Dorn creep dominates the deformation competed to diffusion creep in the grain size range of ~204-255 μm. The maps include only plasticity, phonon or electron drag, and power-law creep when the grain size is higher than ~255 μm, then the grain size has little influence on the maps. Comparison between the reported data for the Mg-Gd-Y alloys and the maps built from available rate equations, it can be conclude that the maps are an effective tool to predict or achieve a comprehensive understanding of the deformation behavior of the Mg-Gd-Y alloys and to classify systematically their discrepancies in the deformation mechanism. However, differences exist in the deformation mechanisms of the alloys observed by the reported data and that predicted by the maps. Therefore, refinement of the maps from the viewpoint of mechanical twining, DRX, and adiabatic shear are necessary.
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Sun, Zhihui, Baoshu Liu, Chenwei He, Lu Xie e Qing Peng. "Shift of Creep Mechanism in Nanocrystalline NiAl Alloy". Materials 12, n. 16 (7 agosto 2019): 2508. http://dx.doi.org/10.3390/ma12162508.

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We have examined the effects of temperature, stress, and grain size on the creep process including creep strain, crystal structure, dislocations and diffusions of nanocrystalline NiAl alloy through molecular dynamics simulations. A smaller grain size accelerates the creep process due to the large volume fraction of grain boundaries. Higher temperatures and stress levels also speed up this process in terms of dislocation changes and atom diffusion. In both primary creep and steady-state creep stages, atomic diffusion at the grain boundary could be seen and the dislocation density increased gradually, indicating that the creep mechanism at these stages is Coble creep controlled by grain boundary diffusion while accompanied by dislocation nucleation. When the model enters the tertiary creep stage, it can be observed that the diffusion of atoms in the grain boundary and in the crystal and the dislocation density gradually decreases, implying that the creep mechanisms at this stage are Coble creep, controlled by grain boundary diffusion, and Nabarro–Herring creep, controlled by lattice diffusion.
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5

Liu, Guo Jun. "Research on Mechanism of Concrete Creep". Applied Mechanics and Materials 670-671 (ottobre 2014): 441–44. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.441.

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Under sustained loads with a fixed value, the deformation of concrete will continue to increase as time increases; this phenomenon is called creep of concrete. Currently, there are several theories to explain the phenomenon of concrete creep, viscoelasticity theory, seepage theory, viscous flow theory, plastic flow theory, micro-fractures theory and internal forces balance theory. Above models mostly studied linear creep of concrete under low stress status. This paper mainly research on concrete creep mechanism, and pointed out the advantages and limitations of the various theories, which has a guiding significance for theoretical research.
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Sun, Qiang, Hong Fei Duan, Lei Xue e Li Qin. "The Micro-Mechanism Analysis on Rock Creep Damage". Advanced Materials Research 194-196 (febbraio 2011): 2031–34. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2031.

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Rock creep is a hot topic and key point in engineering geology. Based on renormalization group theory, the rock creep instability of micro-mechanism can be described as follow: with the expanding and interaction of micro-cracks and the main fault forms, which leads to failure. Comparing with the similarity of rock creep and rock compression process, and combining results of rock creep process, it is shown that there a distinct pertinence between different stages of rock creep. The relationship characteristics of different evolutionary stages can be used to provide scientific foundation for rock creep.
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Zhao, Fei, Jie Zhang, Chenwei He, Yong Zhang, Xiaolei Gao e Lu Xie. "Molecular Dynamics Simulation on Creep Behavior of Nanocrystalline TiAl Alloy". Nanomaterials 10, n. 9 (28 agosto 2020): 1693. http://dx.doi.org/10.3390/nano10091693.

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TiAl alloy represents a new class of light and heat-resistant materials. In this study, the effect of temperature, pressure, and grain size on the high-temperature creep properties of nanocrystalline TiAl alloy have been studied through the molecular dynamics method. Based on this, the deformation mechanism of the different creep stages, including crystal structure, dislocation, and diffusion, has been explored. It is observed that the high-temperature creep performance of nanocrystalline TiAl alloy is significantly affected by temperature and stress. The higher is the temperature and stress, the greater the TiAl alloy’s steady-state creep rate and the faster the rapid creep stage. Smaller grain size accelerates the creep process due to the large volume fraction of the grain boundary. In the steady-state deformation stage, two kinds of creep mechanisms are manly noted, i.e., dislocation motion and grain boundary diffusion. At the same temperature, the creep mechanism is dominated by the dislocation motion in a high-stress field, and the creep mechanism is dominated by the diffusion creep in the low-stress field. However, it is observed to be mainly controlled by the grain boundary diffusion and lattice diffusion in the rapid creep stage.
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Kasum, Kasum, Fajar Mulyana, Mohamad Zaenudin, Adhes Gamayel e M. N. Mohammed. "Molecular Dynamics Simulation on Creep Mechanism of Nanocrystalline Cu-Ni Alloy". Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat 18, n. 1 (26 febbraio 2021): 67. http://dx.doi.org/10.20527/flux.v18i1.8548.

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Abstract (sommario):
Creep mechanism is an essential mechanism for material when subjected to a high temperature and high pressure. It shows material ability during an extreme application to maintain its structure and properties, especially high pressure and temperature. This test is already done experimentally in many materials such as metallic alloys, various stainless steel, and composites. However, understanding the creep mechanism at the atomic level is challenging due to the instruments limitation. Still, the improvement of mechanical properties is expected can be done in such a group. In this work, the creep mechanism of the nanocrystalline Cu-Ni alloy is demonstrated in terms of molecular dynamics simulation. The result shows a significant impact on both temperature and pressure. The deformation supports the mechanisms as a result of the grain boundary diffusion. Quantitative analysis shows a more substantial difference in creep-rate at a higher temperature and pressure parameters. This study has successfully demonstrated the mechanism of creep at the atomic scale and may be used for improving the mechanical properties of the material.
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Osborne, J. W. "Creep as a Mechanism for Sealing Amalgams". Operative Dentistry 31, n. 2 (1 febbraio 2006): 161–64. http://dx.doi.org/10.2341/05-18.

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Clinical Relevance Creep may be a major factor in amalgam sealing from microleakage. Creep expansion causes amalgam to fill in the tooth/amalgam interface gap and causes the restoration to extrude out of the preparation.
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Nabarro, F. R. N. "The mechanism of Harper-Dorn creep". Acta Metallurgica 37, n. 8 (agosto 1989): 2217–22. http://dx.doi.org/10.1016/0001-6160(89)90147-8.

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Tesi sul tema "Creep mechanism"

1

Dok, Atitkagna. "Tertiary Creep Behavior of Landslides Induced by Extreme Rainfall: Mechanism and Application". 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/175207.

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Zheng, Xiao-Qin Materials Science &amp Engineering Faculty of Science UNSW. "Packing of particles during softening and melting process". Awarded by:University of New South Wales. School of Materials Science & Engineering, 2007. http://handle.unsw.edu.au/1959.4/31517.

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Softening deformation of iron ore in the form of sinter, pellet, and lump ore in the cohesive zone of an ironmaking blast furnace is an important phenomenon that has a significant effect on gas permeability and consequently blast furnace production efficiency. The macroscopic softening deformation behavior of the bed and the microscopic deformation behavior of the individual particles in the packed bed are investigated in this study using wax balls to simulate the fused layer behavior of the cohesive zone. The effects of softening temperature, load pressure, and bed composition (mono - single melting particles, including pure or blend particles vs binary ??? two different melting point particles) on softening deformation are examined. The principal findings of this study are: 1. At low softening temperatures, an increase in load pressure increases the deformation rate almost linearly. 2. At higher softening temperatures, an increase in load pressure dramatically increases the deformation rate, and after a certain time there is no more significant change in deformation rate. 3. The bed deformation rate of a mono bed is much greater than that of a binary one. 4. In a binary system, the softening deformation rate increases almost proportionally with the increase in the amount of lower melting point wax balls. 5. In a mono system with blend particles, the content of the lower melting point material has a more significant effect on overall bed deformation than the higher melting point one. 6. The macro softening deformation of the bed behaves the theory of creep deformation. 7. A mathematical model for predicting bed porosity change due to softening deformation based on creep deformation theory has been developed. 8. Increase in load pressure also reduces the peak contact face number of the distribution curves, and this is more prominent with higher porosity values. 9. The contribution of contact face number to bed porosity reduction is more pronounced in a mono system than in a binary system. 10. The porosity reduction in a binary bed is more due to the contact face area increase, presumably of the lower melting point particles. 11. The mono system has a single peak contact face number distribution pattern while the binary system exhibits a bimodal distribution pattern once the higher melting point material starts to deform. 12. In a binary system, an increase in deformation condition severity tends to reduce the contact face number of the higher melting point material without having to increase the contact face number of the lower melting point material accordingly to achieve a given porosity.
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Mirmasoudi, Sara. "High Temperature Transient Creep Analysis of Metals". Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1452693927.

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Niemeier, William. "Design and Testing of a Linear Compliant Mechanism with Adjustable Force Output". Scholar Commons, 2018. http://scholarcommons.usf.edu/etd/7203.

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This thesis presents a novel compliant mechanism with adjustable force output. The force comes from the bending of a rectangular cross section beam within the mechanism. By rotating this beam with a stepper motor, the force output of the mechanism changes. A model was made to simulate this mechanism, and a prototype was made based off of this data. A test apparatus was constructed around this mechanism, and a series of tests were performed. These tests adjusted parameters such as beam rotation speed and weight in order to characterize the system. Adjustments were made based on this information and the mechanism was refined. The results suggest the following. The speed has a negligible effect on the behavior of the system, while the weight, length of top link r3, and position of bottom stop have a significant effect. Also, there is a large, consistent amount of hysteresis in the system. This is likely caused by the beam storing torsion or friction from the slider.
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Yang, Xin. "The development of creep damage constitutive equations for high chromium steel based on the mechanism of cavitation damage". Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34682/.

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Due to increasing electrical energy power supply, thermal efficiency and the desire to reduce CO2 emissions, creep-resistant high chromium steels are becoming widely developed and applied for components of electric power plants under high pressure at high temperature. The limited design factors such as strain histories, damage evolution and lifetime are important factors when creating the components of a power plant. Obtaining a long-term (100,000h, over 11 years) creep data is time consuming and costly, hence long-term creep data is very limited, and the extrapolation using the conventional empirical methods may not be reliable due to limited data (Chen et al., 2011; Shrestha et al., 2013; Ghosh et al., 2013). To design against failures, creep damage constitutive equations have the advantage of traceability from the physics based constitutive equation to the fundamental microstructural and damage behaviour. Thus, creep modelling constitutive equations for materials of the critical components of, for example, power plants and other safety critical systems, are a key issue in the research of materials. In the past decade, a range of creep damage constitutive equations have been developed to describe creep damage behaviour for high chromium steel, however, some models are only based on creep deformation (creep microstructural degradation) and are not really concerned with cavitation damage, which is a dominant factor in creep rupture; most of them are proposed based on high stress levels of high chromium steel and extended to a low stress level, the modelling results fail to explore the phenomenon of stress breakdown. Besides, the cavitation damage equations were developed on experimental data of pure metal and super alloy, the fundamental nature of the evolution of creep cavitation damage is still unclear and necessary to solve for high chromium steel. Thus, the aim of this research project was to develop a novel creep damage constitutive equation for high chromium steel based on the mechanism of cavitation damage under a wide range of stress levels. This research made contributions to the specialised knowledge on the following three aspects. Firstly, a modified hyperbolic sine law, which describes the relationship between minimum creep strain and applied stress, was applied to high chromium steel. Through which we found that the modelling results fitted better with published experimental data by NIMS in comparison with conventional functions such as power law, hyperbolic sine law and linear power law. The other two aspects of innovation in the development of creep damage constitutive equation had been achieved. Secondly, using the quantitatively analysed results of the cavity size distribution along grain boundary by the superior 3D technology of X-ray micro-tomography, a novel creep cavitation damage equation was developed and applied to describe the evolution of cavity along grain boundary in the creep process for high chromium steel. Thirdly, the novel creep damage constitutive equations, that coupled appropriate creep deformation mechanisms with the new cavitation damage equation, were successfully applied to high chromium steel under a wide range of stress level according to comparisons made between the modelling results of novel creep damage constitutive equations, classic uniaxial KRH constitutive equations and experimental data for P91 steel at 600°C and also applied to P91 steel at 625°C.
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Lv, Duchao. "A Multi-Scale Simulation Approach to Deformation Mechanism Prediction in Superalloys". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469009668.

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Ahmed, Sheikh Saad. "Development of Innovative Load Transfer Mechanism to Reduce Hurricane-Induced Failures in New and Existing Residential Construction". FIU Digital Commons, 2010. http://digitalcommons.fiu.edu/etd/157.

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Implicit in current design practice of minimum uplift capacity, is the assumption that the connection's capacity is proportional to the number of fasteners per connection joint. This assumption may overestimate the capacity of joints by a factor of two or more and maybe the cause of connection failures in extreme wind events. The current research serves to modify the current practice by proposing a realistic relationship between the number of fasteners and the capacity of the joint. The research is also aimed at further development of non-intrusive continuous load path (CLP) connection system using Glass Fiber Reinforced Polymer (GFRP) and epoxy. Suitable designs were developed for stud to top plate and gable end connections and tests were performed to evaluate the ultimate load, creep and fatigue behavior. The objective was to determine the performance of the connections under simulated sustained hurricane conditions. The performance of the new connections was satisfactory.
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Srivastava, Ankit. "Mechanics and Mechanisms of Creep and Ductile Fracture". Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc283799/.

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The main aim of this dissertation is to relate measurable and hopefully controllable features of a material's microstructure to its observed failure modes to provide a basis for designing better materials. The understanding of creep in materials used at high temperatures is of prime engineering importance. Single crystal Ni-based superalloys used in turbine aerofoils of jet engines are exposed to long dwell times at very high temperatures. In contrast to current theories, creep tests on Ni-based superalloy specimens have shown size dependent creep response termed as the thickness debit effect. To investigate the mechanism of the thickness debit effect, isothermal creep tests were performed on uncoated Ni-based single crystal superalloy sheet specimens with two thicknesses and under two test conditions: a low temperature high stress condition and a high temperature low stress condition. At the high temperature, surface oxidation induced microstructural changes near the free surface forming a layered microstructure. Finite element calculations showed that this layered microstructure gave rise to local changes in the stress state. The specimens also contained nonuniform distribution of initial voids formed during the solidification and homogenization processes. The experiments showed that porosity evolution could play a significant role in the thickness debit effect. This motivated a basic mechanics study of porosity evolution in single crystals subjected to creep for a range of stress states. The study was performed using three-dimensional finite deformation finite element analysis of unit cells containing a single initially spherical void in a single crystal matrix. The materials are characterized by a rate-dependent crystal plasticity constitutive relation accounting for both primary and secondary creep. The effect of initial void spacing and creep exponent was also explored. Based on the experimental observations and results of finite element calculations a quantitative mechanistic model is proposed that can account for both bulk and surface damage effects and assess their relative roles in the observed thickness debit effect. Another set of calculations aim at relating the crack growth resistance and fracture surface morphology to material microstructure for ductile structural metals. The process that governs the ductile fracture of structural materials at room temperature is one of nucleation, growth and coalescence of micron scale voids, and involves large plastic deformations. Experimental studies have shown that fracture surfaces in a wide variety of materials and under a wide variety of loading conditions have remarkable scaling properties. For thirty years, the hope to relate the statistical characterization of fracture surfaces to a measure of a material's crack growth resistance has remained unfulfilled. Only recently has the capability been developed to calculate sufficient amounts of three dimensional ductile crack growth in heterogeneous microstructures to obtain a statistical characterization of the predicted fracture surfaces. This development has enabled the exploration of the relation of both fracture toughness and fracture surface statistics to material properties and microstructure when the fracture mechanism is one of void nucleation, growth and coalescence. The relation of both toughness and the statistical properties of fracture surfaces in calculations of heterogeneous microstructures to various microstructural features is discussed and a remarkable correlation between fracture surface roughness and fracture toughness is shown for the first time.
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Zhang, Bochun. "Failure Mechanism Analysis and Life Prediction Based on Atmospheric Plasma-Sprayed and Electron Beam-Physical Vapor Deposition Thermal Barrier Coatings". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35709.

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Using experimentally measured temperature-process-dependent model parameters, the failure analysis and life prediction were conducted for Atmospheric Plasma Sprayed Thermal Barrier Coatings (APS-TBCs) and electron beam physical vapor deposition thermal barrier coatings (EB-PVD TBCs) with Pt-modified -NiAl bond coats deposited on Ni-base single crystal superalloys. For APS-TBC system, a residual stress model for the top coat of APS-TBC was proposed and then applied to life prediction. The capability of the life model was demonstrated using temperature-dependent model parameters. Using existing life data, a comparison of fitting approaches of life model parameters was performed. The role of the residual stresses distributed at each individual coating layer was explored and their interplay on the coating’s delamination was analyzed. For EB-PVD TBCs, based on failure mechanism analysis, two newly analytical stress models from the valley position of top coat and ridge of bond coat were proposed describing stress levels generated as consequence of the coefficient of thermal expansion (CTE) mismatch between each layers. The thermal stress within TGO was evaluated based on composite material theory, where effective parameters were calculated. The lifetime prediction of EB-PVD TBCs was conducted given that the failure analysis and life model were applied to two failure modes A and B identified experimentally for thermal cyclic process. The global wavelength related to interface rumpling and its radius curvature were identified as essential parameters in life evaluation, and the life results for failure mode A were verified by existing burner rig test data. For failure mode B, the crack growth rate along the topcoat/TGO interface was calculated using the experimentally measured average interfacial fracture toughness.
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Gieseke, Brian G. "Mechanics and mechanisms of creep-fatigue crack growth in Cu-1 wt% Sb". Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/19982.

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Libri sul tema "Creep mechanism"

1

Creep mechanics. 2a ed. Berlin: Springer, 2005.

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service), SpringerLink (Online, a cura di. Creep Mechanics. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2008.

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3

Betten, Josef. Creep Mechanics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002.

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Betten, Josef. Creep Mechanics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04971-6.

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Dresen, Georg, Mark Handy e Christoph Janssen. Deformation Mechanisms Rheology Microstructures. Potsdam: [Neustadt an der Weinstrasse], 1999.

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Evans, R. W. Introduction to creep. London: Institute of Materials, 1993.

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Leicester), European Mechanics Colloquium 239 "Mechanics of Creep Brittle Materials" (1988 University of. Mechanics of creep brittle materials 1. London: Elsevier Applied Science, 1989.

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Cocks, A. C. F. Mechanics of Creep Brittle Materials 1. Dordrecht: Springer Netherlands, 1989.

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Cocks, A. C. F. Mechanics of Creep Brittle Materials 2. Dordrecht: Springer Netherlands, 1991.

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Cocks, A. C. F., e A. R. S. Ponter, a cura di. Mechanics of Creep Brittle Materials 2. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3688-4.

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Capitoli di libri sul tema "Creep mechanism"

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Paipetis, S. A. "Creep in Wood". In History of Mechanism and Machine Science, 77–79. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2514-2_10.

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Boitier, G., J. L. Chermant, H. Cubero, S. Darzens, G. Farizy, J. Vicens e J. C. Sangleboeuf. "CMC Creep Mechanism under Argon". In High Temperature Ceramic Matrix Composites, 492–97. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527605622.ch76.

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Chermant, Jean-Louis, Gaëlle Farizy, Guillaume Boitier, Séverine Darzens, Jean Vicens e Jean-Christophe Sangleboeuf. "Creep Behavior and Mechanism for CMCs with Continuous Ceramic Fibers". In Fracture Mechanics of Ceramics, 203–19. Boston, MA: Springer US, 2005. http://dx.doi.org/10.1007/978-0-387-28920-5_16.

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Suzuki, Shiyu, Motoki Sakaguchi, Ryota Okamoto, Hideaki Kaneko, Takanori Karato, Kenta Suzuki e Masakazu Okazaki. "Competing Mechanism of Creep Damage and Stress Relaxation in Creep-Fatigue Crack Propagation in Ni-Base Superalloys". In Superalloys 2020, 352–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51834-9_34.

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Isaac Samuel, E., Durga Prasad Rao Palaparti, S. D. Yadav, J. Christopher e B. K. Choudhary. "Identifying the Creep Deformation Mechanism in P9 Steel at Elevated Temperatures". In Lecture Notes in Mechanical Engineering, 397–403. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8767-8_33.

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Sawada, K., M. Tabuchi e K. Kimura. "Degradation Mechanism of Creep Strength Enhanced Ferritic Steels for Power Plants". In Materials Challenges and Testing for Supply of Energy and Resources, 35–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23348-7_4.

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Tackley, P. J., e D. J. Stevenson. "A Mechanism for Spontaneous Self-Perpetuating Volcanism on the Terrestrial Planets". In Flow and Creep in the Solar System: Observations, Modeling and Theory, 307–21. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-015-8206-3_19.

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Zheng, Ya-Xiong, Li-Sha Niu, Ting-Ting Dai e Hui-Ji Shi. "Elastic and Plastic Creep Mechanism in Thin Metal Films using FEM Method". In Particle and Continuum Aspects of Mesomechanics, 473–80. London, UK: ISTE, 2010. http://dx.doi.org/10.1002/9780470610794.ch48.

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Parrish, David K., e Anthony F. Gangi. "A Nonlinear Least Squares Technique for Determining Multiple-Mechanism, High-Temperature Creep Flow Laws". In Mechanical Behavior of Crustal Rocks, 287–98. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm024p0287.

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Betten, Josef. "Damage Mechanics". In Creep Mechanics, 131–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04971-6_7.

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Atti di convegni sul tema "Creep mechanism"

1

Zhou, Yu, Chen Xuedong, Zhichao Fan e Han Yichun. "An Improved Mechanism-Based Creep Constitutive Model Using Stress-Dependent Creep Ductility". In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63447.

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Creep ductility which is assumed to be constant at a given temperature in many creep constitutive models, actually varies with temperature, stress level and creep strain rate, etc. In this paper, the relationship between creep ductility and stress levels of ferritic steels has been briefly discussed from the perspective of failure mechanisms. It can be generally divided into three regimes, including the upper shelf, lower shelf and the transition regime. The four-parameter logistic model has been adopted to quantitatively describe the stress-dependent creep ductility. Furthermore, a modified mechanism-based continuum damage mechanics (CDM) model for ferrtic steels has been proposed using the stress-dependent creep ductility model. Uniaxial creep tests of 2.25Cr1Mo0.25V steel at three stress levels have been carried out and the experimental data points realistically reflecting the creep behavior have been carefully selected to fit the improved CDM model using genetic algorithm (GA). It is shown that the improved model has the capability to characterize the whole creep process of ferritic steels and the stress-dependent creep ductility over a wide range of applied stress.
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2

Bonora, Nicola, e Luca Esposito. "Mechanism Based Unified Creep Model Incorporating Damage". In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61034.

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Although it is often said that diffusional flow creep is out of the practical engineering applications, the need for a unified model capable to account for the resulting action of both diffusional and dislocation type creep is justified by the increasing demands of reliable creep design for very long lives (exceeding 100.000h), high stress-low temperatures and high temperature-low stress regimes. In this paper, a unified creep model formulation, in which the change of the creep mechanism has been accounted for through an explicit dependence of the exponent n on stress and temperature, has been proposed. The model has been also extended incorporating damage processes, characteristics of creep stage IV, adopting a time independent damage formulation proposed by the authors. An application example of the proposed approach to high purity aluminum is given.
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3

Gustilo, Paul Angelo D., e Joyce Lyn G. Fernandez. "Metallographic Investigation on Solder Creep Phenomenon". In ISTFA 2012. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.istfa2012p0562.

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Abstract Solder bulging is detected on the exposed paddle of Device A after burn-in causing the affected units to fail the coplanarity criteria. The affected units show up at random burn-in board socket locations and occur with varying frequency. Potential causes are plotted through an Ishikawa diagram which reveal fusion and creep as the potential mechanisms behind the solder bulging phenomenon. This paper seeks to determine the mechanism behind the solder bulging phenomenon via a 2-step metallographic investigation through (i) material deformation characterization and (ii) deformation mechanism simulation. In material deformation characterization, visual inspection on affected units show that the solder bulge is generally circular and is located on the center of the exposed paddle. Moreover, SEM/EDX analysis reveal that the solder bulge is not caused by a foreign contaminant or a compositional anomaly in the solder plating. On the other hand, deformation mechanism simulation involves the metallographic comparison between controlled simulations of fusion and creep versus the actual unit with solder bulge. Metallographic inspection reveal that the grain size and grain shape of the solder bulge possess the characteristics of creep phenomenon. Additionally, investigation on the burn-in (BI) process conditions also supports creep over fusion as the mechanism behind the solder bulging phenomenon. The static stress induced by the socket on the package at elevated temperature caused the solder plating to creep towards the free area which is the hole on the bottom of the socket.
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4

Zhan, Jianjun, Hiromichi Takemura e Kinji Yukawa. "A Study on Bearing Creep Mechanism With FEM Simulation". In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41366.

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Because of the continuous quests for high performance and compact structure of automobile and machine in recent years, rolling bearings are required to work under harder conditions of high speed and heavy load than before. The applications of hard condition may lead to a greater likelihood of happening of bearing malfunctions such as flaking, wear, creep, fracture etc. In this paper, the phenomenon called outer ring creep occurring in bearings subject to non-rotating load is discussed. Outer ring creep is referred to that bearing outer ring rotates relatively to the housing in certain applications. Outer ring creep may result in such problems as unusual noise and vibration and may cause wear of housing and outer ring. If abrasive particles caused by wear of the ring and housing enter the raceway, the bearing may be damaged and destroyed. Conventionally, the problem of outer ring creep was considered to be a result of rotating bearing load. However, even if the direction of radial load remained relatively unchanged, outer ring creep is observed in many cases. The generation mechanism of this kind of outer ring creep has not yet been made clear till now. With FEM simulation and test verification, we analyzed the phenomenon of outer ring creep under non-rotating load. We concluded that outer ring creep under non-rotating load is a result of localized strain and rippling deformation caused by rolling elements. In this paper, only outer ring creep is discussed below, but the similar result can be obtained for inner ring creep.
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5

Dichiaro, Simone, Luca Esposito e Nicola Bonora. "Evaluation of Constraint Effect on Creep Crack Growth by Advanced Creep Modeling and Damage Mechanics". In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-29105.

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Effects of constraint induced by crack depth and sample geometry on creep crack behavior of high chromium steels was investigated by numerical simulation. An advanced mechanism-based creep model formulation, which accounts for primary and secondary creep stage was used. Here, the transient creep rate is modeled considering the evolution of the internal stress with the activation energy while the steady state creep rate is modelled considering both diffusional and dislocation creep mechanisms. This formulation allows one to predict accurately creep strain accumulation over a wide range of stress and temperature. Model parameters were identified on constant load creep tests and their transferability to the multiaxial state of stress was verified comparing predicted creep life with data obtained on notched bar samples. Continuum damage mechanics was used to predict the occurrence of tertiary creep stage and crack advance. To this purpose, a non-linear damage law, as proposed in Bonora and Esposito [1] was used. The effect of the geometry constrain on creep crack growth was investigated in different sample geometries (C(T), SEN(T), SEN(B), DEN(T) and CCP(T)) for a given crack depth values, and the same biaxiality ratio for SEN(T), SEN(B) and DEN(T). Numerical simulation results were validated by comparison with available experimental data for P91 steels.
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6

Lee, Hoomin, Seok-Jun Kang, Jae-Boong Choi e Moon-Ki Kim. "Creep Life Prediction of HR3C Steel Using Creep Damage Models". In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65923.

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The world’s energy market demands more efficient power plants, hence, the operating conditions become severe. For thermal plants, Ultra Super Critical (USC) conditions were employed with an operating temperature above 600°C. In such conditions, the main failure mechanism is creep rupture behavior. Thus, the accurate creep life prediction of high temperature components in operation has a great importance in structural integrity evaluation of USC power plants. Many creep damage models have been developed based on continuum damage mechanics and implemented through finite element analysis. The material constants in these damage models are derived from several accelerated uniaxial creep experiments in high stress conditions. In this study, the target material, HR3C, is an austenitic heat resistant steel which is used in reheater/superheater tubes of an USC power plant built in South Korea. Its creep life was predicted by extrapolating the creep rupture times derived from three different creep damage models. Several accelerated uniaxial creep tests have been conducted in various stress conditions in order to obtain the material constants. Kachanov-Rabotnov, Liu-Murakami and the Wen creep damage models were implemented. A comparative assessment on these three creep damage models were performed for predicting the creep life of HR3C steel. Each models require a single variable to fit the creep test curves. An optimization error function were suggested by the authors to quantify the best fit value. To predict the long term creep life of metallic materials, the Monkman-Grant model and creep rupture property diagrams were plotted and then extrapolated over an extended range. Finally, it is expected that one can assess the remaining lifetime of UCS power plants with such a valid estimation of long-term creep life.
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7

Alomari, Abdullah S., Nilesh Kumar e Korukonda L. Murty. "Investigation on Creep Mechanisms of Alloy 709". In ASME 2017 Nuclear Forum collocated with the ASME 2017 Power Conference Joint With ICOPE-17, the ASME 2017 11th International Conference on Energy Sustainability, and the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/nuclrf2017-3649.

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To improve efficiency, safety, and reliability of nuclear reactors, structural materials for Gen-IV reactors are being designed and developed. Alloy 709, a 20Cr-25Ni austenitic stainless steel, has superior mechanical properties to be a preferred candidate material for Sodium Fast Reactor structural application. Creep tensile tests were performed at temperatures of 700 °C, 725 °C and 750 °C and range of stresses from 100 MPa to 250 MPa. The apparent stress exponent and activation energy were found to be 10.3±0.4 and 368.6±14.7 kJ/mol. Linear extrapolation method was used to rationalize the higher stress exponent and activation energy relative to the mechanism in power law creep yielding to a true stress exponent of 7.1 ± 0.3 and a true activation energy of 277 ± 12.8 kJ/mol which is close to the lattice diffusion of iron in Fe-20Cr-25Ni. Hence, the lattice diffusion controlled dislocation climb process is believed to be the rate controlling creep deformation mechanism in this range of stresses and temperatures. The appropriate constitutive equation was developed based on the results; however, microstructural evaluations are under investigation to confirm the rate controlling mechanism. In addition, creep tests at higher temperatures and lower stresses are being conducted to extend the stress and strain-rate ranges to observe possible transition in creep mechanism.
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8

Marriott, Douglas L., Herbert E. Stumph, Arun Sreeranganathan e Christopher J. Matice. "Simplified Computation of Creep Damage Propagation". In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63781.

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The commonly accepted approach to dealing with material damage as the cause of structural failure is to treat the most highly distressed location in the structure as an equivalent simple test and to define failure of the structure as a whole as being failure at that point location. The exception to this rule is plastic deformation. Yielding at a point was recognized several decades ago as being an excessively conservative definition of component failure and it is now standard design practice to accept failure as being the limit load, which is only reached, sometimes after extensive propagation of a plastic zone. Other material failure mechanisms also occur after a finite period of damage propagation, but this additional strength, or life, is not usually taken into account, partly because the damage mechanisms themselves are not always well defined, and partly because of the computational difficulty involved in assessing the propagation of damage. Creep rupture falls into the category of a mechanism which can enjoy an extensive period of damage propagation before structural failure occurs, but the difficulty of evaluating it quantitatively has meant that it continues to be dealt with as essentially a point failure phenomenon. Relatively recently, many of the problems associated with assessing creep damage have been resolved, on the material side by increased use of so-called “continuum damage mechanics” based models such as Kachanov and Omega and, on the computational side, by the exponential growth in the capabilities of advanced Finite Element Analysis. It is now possible in principle to trace the entire life of a complex component, down to final disintegration. However, this capability still comes at a significant cost, and there is still room for simplification in order to bring this capability to a wider range of potential users. This paper describes a process for evaluating the propagation of creep damage, down to the point of total disintegration, using approximations which exist within the standard capabilities of a typical FE design package. This innovation does not do anything that cannot be done today using the full repertoire of computational tools that exist, notably user subroutines, but provides a simpler platform which can be used to push damage evaluation further into the activities of day-to-day design with a significant reduction in the resource allocation currently required to do the job. Results are compared with creep experiments on notched bars.
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9

Korb, J. P., L. Patural, A. Govin e Ph Grosseau. "NMR Investigations of Water Retention Mechanism by Cellulose Ethers in Cement-Based Materials". In Ninth International Conference on Creep, Shrinkage, and Durability Mechanics (CONCREEP-9). Reston, VA: American Society of Civil Engineers, 2013. http://dx.doi.org/10.1061/9780784413111.011.

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10

Hayakawa, Hiroyuki, Satoshi Nakashima, Junichi Kusumoto, Akihiro Kanaya, Daisuke Terada, Fuyuki Yoshida e Hideharu Nakashima. "Evaluation of Creep Deformation Mechanism of Heat Resistant Steel by Stress Change Test". In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/creep2007-26501.

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In order to evaluate creep deformation mechanism of heat resistant steels, stress change tests were conducted during creep tests. In this study, it was confirmed that the dislocation behavior during the creep tests was in viscous manner, because no instantaneous plastic strain was observed at stress increments. Transient behavior was observed after stress changes for all kinds of steel in this work. Mobility of dislocation was evaluated by the observed backward creep behavior after stress reduction. Internal stress was evaluated by the change of creep rate in stress increment, and mobile dislocation density was evaluated with the estimated mobility of dislocation and the change of creep rate in stress increment. It was found that the variation of mobile dislocation density during creep deformation showed the same tendency as the variation of creep rate. Therefore mobile dislocation density is the dominant factor that influences the creep rate variation in creep deformation of heat resistant steels investigated in this work. The mobility of dislocation showed a good correlation with 1/T and it is related with the amount of solute Mo that is a solution strengthening element. Microstructure of crept specimens was observed by TEM to discuss the validation of these results.
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Rapporti di organizzazioni sul tema "Creep mechanism"

1

Tome, Carlos, Wei Wen e Laurent Capolungo. Mechanism-based modeling of solute strengthening: application to thermal creep in Zr alloy. Office of Scientific and Technical Information (OSTI), agosto 2017. http://dx.doi.org/10.2172/1373532.

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2

Mukherjee, A. K., e H. Green. Investigation of the rate-controlling mechanism(s) for high temperature creep and the relationship between creep and melting by using high pressure as a variable. Final report. Office of Scientific and Technical Information (OSTI), dicembre 1994. http://dx.doi.org/10.2172/96989.

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3

Zhang, XI-Cheng, David Hurley e Albert Redo-Scanchez. Non Destructive Thermal Analysis and In Situ Investigation of Creep Mechanism of Graphite and Ceramic Composites using Phase-sensitive THz Imaging & Nonlinear Resonant Ultrasonic Spectroscopy. Office of Scientific and Technical Information (OSTI), novembre 2012. http://dx.doi.org/10.2172/1056847.

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4

Michael E. Kassner. Rate-Controlling Mechanisms in Five-Power-Law Creep. Office of Scientific and Technical Information (OSTI), aprile 2004. http://dx.doi.org/10.2172/822659.

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5

Bewlay, Bernard P., Melvin R. Jackson e Clyde L. Briant. Creep Mechanisms in High-Temperature In-Situ Composites. Fort Belvoir, VA: Defense Technical Information Center, agosto 1999. http://dx.doi.org/10.21236/ada369335.

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6

Rabiei, Afsaneh, Paul Bowen, Amrita Lall, Siddhartha Sarkar, Swathi Upadhyay, Suyang Yu, Jin Yan, Rengen Ding e Hangyue Li. Creep and Creep-Fatigue Crack Growth Mechanisms in Alloy709 — NEUPRC-3.2 (Final Report). Office of Scientific and Technical Information (OSTI), aprile 2019. http://dx.doi.org/10.2172/1511040.

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7

Eapen, Jacob, Korukonda Murty e Timothy Burchell. Understanding Creep Mechanisms in Graphite with Experiments, Multiscale Simulations, and Modeling. Office of Scientific and Technical Information (OSTI), giugno 2014. http://dx.doi.org/10.2172/1167180.

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8

Argon, Ali S. The Mechanisms of Creep Resistance of Advanced Ceramic Eutectics: Experiments and Modeling. Fort Belvoir, VA: Defense Technical Information Center, agosto 2003. http://dx.doi.org/10.21236/ada417986.

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9

Michael J. Mills. Mechanisms of High Temperature/Low Stress Creep of Ni-Based Superalloy Single Crystals. Office of Scientific and Technical Information (OSTI), marzo 2009. http://dx.doi.org/10.2172/948728.

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10

K. Linga. Deformation Microstructures and Creep Mechanisms in Advanced ZR-Based Cladding Under Biazal Loading. Office of Scientific and Technical Information (OSTI), agosto 2008. http://dx.doi.org/10.2172/936311.

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