Modeling Stress Strain Curves for Nonlinear Analysis

Hu Sheng Gao

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

Paper Titles

Elasto-Plastic Dynamic Explicit Analysis of Cold Ring Rolling Process
p.508

Numerical Simulation Analysis on Cold Closed-Die Forging of Differential Satellite Gear in Car
p.517

Fast Prediction of Springback at Product Design Stage for Sheet Metal Forming
p.525

3D Thermal Mechanical Coupled Elasto-Plastic Finite Element Analysis in the Whole Rolling Process of H-Beam
p.532

Modeling Stress Strain Curves for Nonlinear Analysis
p.539

Rheological Models as the Basic Element of Metal Forming Processes Simulation
p.545

Deforming Mechanisms of Two-Pass Drawing Process of an Aluminum Tube from Circular to Rectangle Section
p.549

Investigation of the Billet Deformation Process in the Dies with Elastic Elements Realizing a Cross and a Longitudinal Shear
p.555

Numerical Simulation on Pharmaceutical Powder Compaction
p.560

HomeMaterials Science ForumMaterials Science Forum Vols. 575-578Modeling Stress Strain Curves for Nonlinear...

Modeling Stress Strain Curves for Nonlinear Analysis

Abstract:

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.