Modeling Stress Strain Curves for Nonlinear Analysis

Abstract:

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Methods of modeling stress strain curves for nonlinear stress analysis are discussed in order to obtain comparable results between different finite element analysts and between different versions of designs. The most common method for modeling stress strain curves is to use Ramberg- Osgood equation. For materials with significant discontinuous yielding, Ramburg-Osgood approximation leads to some problems near discontinuous yielding point. Discontinuous yielding occurs when sudden onset of plastic deformation associated Luders band takes place in a uniform test sample. For engineering structures and machine components, the propagation of Luders band may not occur in deformation process because of non-uniform stress distribution caused by stress concentration, complicated loading condition etc. A modified Ramberg-Osgood method for modeling stress strain curve is proposed.

Info:

Periodical:

Materials Science Forum (Volumes 575-578)

Edited by:

Jitai NIU, Zuyan LIU, Cheng JIN and Guangtao Zhou

Pages:

539-544

DOI:

10.4028/www.scientific.net/MSF.575-578.539

Citation:

H. S. Gao "Modeling Stress Strain Curves for Nonlinear Analysis", Materials Science Forum, Vols. 575-578, pp. 539-544, 2008

Online since:

April 2008

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Price:

$35.00

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