A quasi-flow corner theory of elastic—plastic finite deformation

The numerical and analytical study on stretch flanging of V-shaped sheet metal

“…3, for the purpose of invoking the zero normal stress hypothesis. In this coordinate system, a quasi-flow corner theory [10] is introduced into the following constitutive equation:…”

“…The general expression of the plastic constitutive tensor is (10) in which (11) f (σ ij ,k) = 0 means an arbitrary smooth and convex yield function. For normal anisotropy material, a normal anisotropy yield function [11] is introduced into the present constitutive model.…”

“…In this program, a quasi-flow corner theory of elastic-plastic finite deformation [10] is introduced; the Mindlin shell element model and normally anisotropy yield criterion are employed. The Updated Lagrangian formulation is adopted in the framework of the incremental deformation for sheet metal forming, and equilibrium equations are derived from the principle of virtual velocity.…”

Rate-dependent quasi-flow corner theory for elastic/visco-plastic materials

“…According to the model proposed by Hu et al (1998aHu et al ( ,b, 2001, in no less of generality, the e 0 p and a 0 values are taken to be n and 0:04n, respectively. Now, we assume that…”

A finite element analysis of the flange earrings of strong anisotropic sheet metals in deep-drawing processes

“…Now, a quasi-flow corner theory [1] is introduced into the constitutive tensor described where,/)e is a quasi elasticity tensor whose components are expressed by the quasi elasticity modulus EQ and the quasi Poisson ratio/ZQ. The components EQ and #Q are the functions of the effective plasticity strain ~P EQ E • g(~P) (9) Vol.18, No.…”