Results 251 to 260 of about 35,895 (307)
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Microanalysis of plastic strain
Ultramicroscopy, 1997Abstract A technique for quantifying surface shear strains associated with plastic contact damage has been developed. A complete stereographic mapping of rotational transformations is determined using transmission electron microscopy from trace analysis of contours or convergent beam electron diffraction.
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Anisotropic plasticity model coupled with strain dependent plastic strain and stress ratios
CIRP Annals, 2013It is necessary to describe properly anisotropic material behavior for realistic numerical analyses of sheet metal forming processes. The implementation of many yield criteria in finite element analysis is very complicated. Various material tests are also required to determine yield function coefficients.
Wolfram Volk +3 more
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1968
Truesdell and Noll [1] have given a continuum theory of dislocations for materially uniform, inhomogeneous, simple bodies. If such a body is also elastic, the current stress at each point I is a function of the deformation gradients, calculated relative to a fixed local reference configuration of a neighbourhood of X.
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Truesdell and Noll [1] have given a continuum theory of dislocations for materially uniform, inhomogeneous, simple bodies. If such a body is also elastic, the current stress at each point I is a function of the deformation gradients, calculated relative to a fixed local reference configuration of a neighbourhood of X.
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Strain gradients in plasticity
Acta Mechanica, 1977An analytical model of a plastically deforming solid is assumed to be a material where the second spatial gradients of strain are included in the constitutive equations. These constitutive equations are combined, in a one dimensional shearing problem, with the second law of thermodynamics and condition of thermodynamic stability. The results are that a
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Plastic Stress-Strain Relations
Proceedings of the Institution of Mechanical Engineers, 1948The author derives stress-strain relations which are applicable to problems in which the elastic and plastic strains are of comparable magnitude. Two alternative criteria are used, one based on the Mises-Hencky function and the other on the maximum shear stress.
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Mechanism-Based Strain Gradient Crystal Plasticity
MRS Proceedings, 2004AbstractTo model size dependent plastic deformation at micron and submicron length scales the theory of mechanism-based strain gradient plasticity (MSG) was developed. The MSG approach incorporates the concept of geometrically necessary dislocations into continuum plastic constitutive laws via Taylor hardening relation. This concept is extended here to
Chung-Souk Han +3 more
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Stability of strain-gradient plastic materials
Journal of the Mechanics and Physics of Solids, 2011zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Dal Corso, Francesco, J. R. Willis
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Strain avalanches in plasticity
Philosophical Magazine, 2013Plastic deformation at the mechanism level in all solids occurs in the form of discrete thermally activated individual stress relaxation events. While there are clear differences in mechanisms between dislocation mediated events in crystalline solids and by individual shear transformations in amorphous metals and semiconductors, such relaxation events ...
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Local Plastic Strain Measurement by EBSD
Applied Mechanics and Materials, 2007Work has been carried out recently, which demonstrates misorientation measurements recorded by using electron backscatter diffraction (EBSD) enables one to undertake local post mortem plastic strain quantification once the degree of misorientation is calibrated against plastic strain.
Kamaya, M. +3 more
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Two-Dimensional Strain Cycling in Plasticity
Journal of Applied Mechanics, 1986Detailed calculations are presented for strain cycling in a homogeneous deformation that can be sustained by a biaxial state of stress in thin-walled specimens of OFHC copper. These calculations are made with a set of relatively simple constitutive equations within the framework of the strain-space formulation of plasticity.
Naghdi, P. M., Nikkel, D. J. jun.
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