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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 54
ADVANCES IN FINITE ELEMENT PROCEDURES AND TECHNIQUES
Edited by: B.H.V. Topping
Paper IX.2

Accurate Stress Return Strategies for Hardening-Softening Plasticity

B. Tahar and R.S. Crouch

Department of Civil and Structural Engineering, University of Sheffield, United Kingdom

Full Bibliographic Reference for this paper
B. Tahar, R.S. Crouch, "Accurate Stress Return Strategies for Hardening-Softening Plasticity", in B.H.V. Topping, (Editor), "Advances in Finite Element Procedures and Techniques", Civil-Comp Press, Edinburgh, UK, pp 253-259, 1998. doi:10.4203/ccp.54.9.2
Abstract
There exists a strong need to provide accurate, robust nonlinear constitutive models for use in finite element analyses. This paper responds to this need by adding a new hardening and softening capability and a stable stress return algorithm to an existing isotropic plasticity model for concrete based on fracture energy principles. It illustrates the consequences of employing large strain steps, using the much advocated Closest Point Projection method. The need for an iterative bisector scheme is identified, since the standard backward-Euler method and the step-wise scaling scheme used by others can still lead to a lack of convergence in zones associated with high curvature in the deviatoric planes.

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