Search Results:　 1-16 of 16

NISHIDA Masahiro , YAMAGUCHI Masayoshi , MORI Mika , ISHIHARA Akitoshi , TODO Mitsugu , TAKAYAMA Tetsuo , HAGGBLAD Hans-ake , JONSEN Par

… We determined constants of Drucker-Prager yield criterion for PLLA, and drew the yield curves in the plane stress space and in the second deviatoric stress invariant-first invariant of stress. … The compressive yield stress of PLLA increased with an increase in the strain rate, but PLLA caused the brittle fracture in the dynamic compressive examination. …

Materials and processing conference 2010(18), "244-1"-"244-4", 2010-11-27

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MORITOKI Hitoshi , NAGATA Shin

… A constitutive equation incorporating stress rate dependence which has been used widely is shown to have a limit for its application, especially, in the case that strain rate changes abruptly its direction. … Therefore, the constitutive equation does not have the potential for representing such plastic behaviour that stress vector largely delays relative to strain rate vector. …

Transactions of the Japan Society of Mechanical Engineers. A 71(703), 458-464, 2005-03-25

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GUTIERREZ MARTE , ISHIHARA KENJI , TOWHATA IKUO

… This paper presents an elastoplastic constitutive model for the deformation of sand during loadings involving rotation of principal stress directions. … The model employs a plastic potential formulation that allows for the dependency of flow on the stress increment direction and a stressdilatancy relation that incorporates the effects of the non-coaxiality of the principal stress and principal plastic strain increment directions. …

Soils and Foundations 33(3), 105-117, 1993-09-15

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HIRAI HIROYOSHI

… (iv) The isotropic hardening involves plastic work related to not only volumetric but also deviatoric deformation. … (vi) The constitutive model is capable of describing expansion of yield surface with simultaneous translation in the stress space. …

Soils and Foundations 29(3), 14-24, 1989-09-15

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KANEKO Kenji

… a transitional hardening region and a steady hardening region with respect to elasto-plastic behavior in a five dimensional deviatoric stress space. … The surface G which distinguishes the transitional hardening region from the steady one moves in the direction of the stress vector and transforms its shape. … The associated flow rules are adopted with the two surfaces in determining a corresponding plastic strain increment to a stress increment. …

Bulletin of JSME 27(234), 2687-2693, 1984-12-00

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TOBUSHI Hisaaki , NARUMI Yutaka , KOJIMA Yukinori , HATSUTORI Yoshiaki

… Creep tests and continuous loading tests under combined axial and torsional stresses were carried out along orthogonal bi-linear stress trajectories which are related each other as a mirror transformation in the deviatoric stress vector space. … The results obtained are summarized as follows : (1) The resistance to deformation of the material became remarkably small after the corner of the stress trajectory. …

Journal of the Society of Materials Science, Japan 31(343), 335-340, 1982-04-15

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KANEKO Kenji , IKEGAMI Kozo , SHIRATORI Eiryo

… An anisotropic yield condition and a flow rule of metal for various complex loadings were investigated in the three dimensional deviatoric vector space. … The subsequent yield surface after the pre-strain path with a corner was assumed to translate in the direction of the stress increment vector. …

Bulletin of JSME 19(132), 577-583, 1976-06-00

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TOKUOKA Tatuo

… The stress which results from the shape distortion becomes the deviatoric stress, and therefore the deformation is independent of the pressure. … The mapped constitutive equations to a six-dimensional space are obtained. …

Journal of the Society of Materials Science, Japan 23(249), 448-450, 1974-06-15

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