Results 231 to 240 of about 6,952,969 (304)

Interpretation of the size effects in micropillar compression by a strain gradient crystal plasticity theory

International journal of plasticity, 2019
This work presents a study of the behavior of micropillars compressed with a flat punch, considering a continuum model based on a higher-order strain gradient crystal plasticity theory.
E. Bittencourt
semanticscholar   +1 more source

A new multi-scale framework to incorporate microstructure evolution in phenomenological plasticity: Theory, explicit finite element formulation, implementation and validation

International journal of plasticity, 2017
Representation of anisotropy is a key factor in the predictive capabilities of finite element simulations of metal alloys. Micromechanics-based computational models, such as crystal plasticity, have served as a powerful tool over phenomenological-based ...
C. P. Kohar, J. Bassani, A. Brahme, W. Muhammad, R. Mishra, K. Inal   +5 more
semanticscholar   +1 more source

Crystal Plasticity Theory

2017
Zhengyi Jiang, Jingwei Zhao, Haibo Xie
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On the Theory of Plastic Deformation

Proceedings of the Physical Society. Section A, 1951
A model for plastic deformation in soft metals, i.e. metals which are not age-hardened or severely cold-worked, is given. It is based on the assumption that in real crystals there is always a number of regions present which, by an unknown process, act as sources of dislocations.
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Theory of Plastic Flow versus Theory of Plastic Deformation

Journal of Applied Physics, 1948
Typical theories of plastic flow and plastic deformation are discussed, and the concept of neutral change of stress is introduced. A neutral change of stress can be considered as a limiting case of either loading or unloading. It therefore seems reasonable to demand that the stress-strain relations for both loading and unloading should predict the same
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A statistical theory of polycrystalline plasticity

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1982
Abstract The plasticity and viscoplasticity of polycrystalline materials are studied analytically in terms of lattice dislocations, with the principal effects attributed to non-extended obstacles. Non-equilibrium statistical mecha­nics is used to describe the evolution of the dislocation structures during loading and unloading ...
Ortiz, M., Popov, E. P.
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Theory of Plasticity

1979
The purpose of this course is to present, in condensed form, the methods of the theory of plasticity and especially of Limit Analysis and Design, with emphasis on problems pertaining to civil engineering.
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A Physical theory of asymmetric plasticity

Applied Mathematics and Mechanics, 1995
Various models of plasticity of Cosserat type are constructed. Based on the microscopic mechanism of the rotational plastic deformation, the conservation equations satisfied by the defect motion (dislocation and disclination) are also derived.
Gao, Jian, Lin, Xiaoling
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A theory for rate-dependent plasticity

Computers & Structures, 1985
Abstract The classical theory of plasticity is extended to include rate of deformation effects by the addition of an appropriate rate variable to the definition of the yield surface. Then the incremental behavior of the extended yield surface during plastic deformation produces ratedependent plastic constitutive relations.
W.H. DRYSDALE, A.R. ZAK
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Elasto-plastic damage-theories and elasto-plastic fracturing-theories – a comparison

Computational Materials Science, 1998
Abstract In 1979, based on the pioneering work of Dougill (J.W. Dougill, ZAMP 27 (1976) 423–437), Bažant and Kim developed the so-called elasto-plastic-fracturing theory for concrete (Z.P. Bažant, S.-S. Kim, J. Eng. Mech. Div. 105 (3) (1979) 407–428), taking inelastic deformation due to both plastic slip and stiffness degradation into consideration ...
Wilfried B. Krätzig, Rainer Pölling
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