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Numerical Analysis Method of Overlay Model for Material Nonlinearity Considering Strain Hardening  

Baek, Ki Youl (세종대학교 건축공학과 BK21)
Publication Information
Journal of Korean Society of Steel Construction / v.19, no.3, 2007 , pp. 291-301 More about this Journal
Abstract
The overlay model is a certain kinds of numerical analysis method to present the material non-lineariy which is represented the baushinger effect and the strain hardening. This model simulates the complex behavior of material by controlling the properties of the layers which like the hardening ratio, the section area and the yield stress. In this paper, the constitutive equation and plastic flow rule of each layer which are laid in the plane stress field are obtained by using the thermodynamics. Two numerical examples were tested for the validity of proposed method in uniaxial stress and plane stress field with comparable experimental results. The only parameter for the test is the yield stress distribution of each layers.
Keywords
Overlay model; Strain hardening; Thermodynamics; Plane stress field; von Mises yield function;
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