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Abstract:
Theory
proposed before on the properties of discontinuous bifurcation in
elastic-plastic materials is improved. Based on the new result, the
unified initial direction of discontinuous bifurcations and the
corresponding maximal value of the hardening modulus of the metallic
materials for plane stress are obtained in regard to the unified yield
criterion proposed by Yu in 1991 and 1992. The unified solutions take
account of the inlluence of the intermediate principal stress on the
properties of bifurcations. On the other band, the dependence of the
result of the bifurcation analysis on the adopted yield criterion is
found.
Key words:
Metallic
material Discontinuous bifurcations Unified yield criterion
Plane stress
CLC No: TG113.25
Received
19991207, received in revised form 20000728
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