The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform
Mark Kachanov - One of the best experts on this subject based on the ideXlab platform.
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On the Yield Condition for anisotropic porous materials
Materials Science and Engineering: A, 2001Co-Authors: Igor Sevostianov, Mark KachanovAbstract:The Plastic Yield Condition for a porous material that explicitly reflects pore shapes and orientations is constructed. The cases of Plastic isotropy and transverse isotropy are analyzed in detail. The agreement with the available experimental data is reasonably good.
H. Lippmann - One of the best experts on this subject based on the ideXlab platform.
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On the impact of local rotation on the evolution of an anisotropic Plastic Yield Condition
Journal of the Mechanics and Physics of Solids, 2001Co-Authors: H.p. Truong Qui, H. LippmannAbstract:Isotropic and kinematic hardening is combined with the local, average lattice rotation in order to describe the hardening behaviour of a polycrystalline metal in terms of continuum mechanics. This approach is adapted by means of parameter identification to experimental results by Boehler and Koss (In: Bruller O., Mannl V., Najar J. (Eds.), Advances in Continuum Mechanics. Springer, Berlin, (1991) pp. 143) Koss (Ecrouissage isotrope et anisotrope des aciers laminees soumis a de grandes deformations. Thesis, Universite Joseph Fourier, Grenoble I. (1992)) as well as to the experiments of the authors; a fair to good agreement is achieved. Although in particular, kinematic hardening fits the experimental data quite well it will be seen that the generalised, linear Prager hardening rule does not hold. Moreover it is found that the local rotation may differ considerably from the classical rotation, induced by the Plastic flow field. Its magnitude, obtained by the authors, agrees well with the values, obtained via a direct texture analysis by Bunge and Nielsen using a similar material. Finally a conjecture by Boehler and Koss is checked, according to which an initial orthotropy vanishes completely under a secondary stretching along an axis, different from the axes of material symmetry, while subsequently a new orthotropy is generated along the axis of secondary stretch. This mechanism contradicts another one postulated by Kim and Yin (J. Mech. Phys. Solids 45 (1997) 841) according to which the axes of orthotropy rotate continuously from the initial to the asymptotic new position.
Igor Sevostianov - One of the best experts on this subject based on the ideXlab platform.
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On the Yield Condition for anisotropic porous materials
Materials Science and Engineering: A, 2001Co-Authors: Igor Sevostianov, Mark KachanovAbstract:The Plastic Yield Condition for a porous material that explicitly reflects pore shapes and orientations is constructed. The cases of Plastic isotropy and transverse isotropy are analyzed in detail. The agreement with the available experimental data is reasonably good.
H.p. Truong Qui - One of the best experts on this subject based on the ideXlab platform.
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On the impact of local rotation on the evolution of an anisotropic Plastic Yield Condition
Journal of the Mechanics and Physics of Solids, 2001Co-Authors: H.p. Truong Qui, H. LippmannAbstract:Isotropic and kinematic hardening is combined with the local, average lattice rotation in order to describe the hardening behaviour of a polycrystalline metal in terms of continuum mechanics. This approach is adapted by means of parameter identification to experimental results by Boehler and Koss (In: Bruller O., Mannl V., Najar J. (Eds.), Advances in Continuum Mechanics. Springer, Berlin, (1991) pp. 143) Koss (Ecrouissage isotrope et anisotrope des aciers laminees soumis a de grandes deformations. Thesis, Universite Joseph Fourier, Grenoble I. (1992)) as well as to the experiments of the authors; a fair to good agreement is achieved. Although in particular, kinematic hardening fits the experimental data quite well it will be seen that the generalised, linear Prager hardening rule does not hold. Moreover it is found that the local rotation may differ considerably from the classical rotation, induced by the Plastic flow field. Its magnitude, obtained by the authors, agrees well with the values, obtained via a direct texture analysis by Bunge and Nielsen using a similar material. Finally a conjecture by Boehler and Koss is checked, according to which an initial orthotropy vanishes completely under a secondary stretching along an axis, different from the axes of material symmetry, while subsequently a new orthotropy is generated along the axis of secondary stretch. This mechanism contradicts another one postulated by Kim and Yin (J. Mech. Phys. Solids 45 (1997) 841) according to which the axes of orthotropy rotate continuously from the initial to the asymptotic new position.
D A Hills - One of the best experts on this subject based on the ideXlab platform.
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a comparison of the state of stress at an incomplete fretting contact edge with a crack tip
Tribology International, 2021Co-Authors: J P J Truelove, D A HillsAbstract:Abstract The similarity in implied process zones, based on violations of the Plastic Yield Condition, between the state of stress at the edge of an incomplete contact subject to reciprocating shear and tension and a crack suffering pure mode II loading are compared. This is done for both small and large amounts of edge slip, i.e. when the frictional slip region is either enveloped by the Plastic region or envelops it. The results show that for realistic coefficients of friction strong agreement is unlikely to occur, so that attempting to analyse the nucleation of fretting cracks as a form of crack branching/turning is inappropriate and the effect of normal load on crack nucleation is an important consideration.