Numerical analysis of the stress-strain curve and fracture initiation for ductile material

✍ Scribed by K.S. Zhano; Z.H. Li

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 494 KB
• Volume: 49
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(94)90006-x

✦ Synopsis

Ahatraet-In the present paper, a way to obtain an accurate stress-strain curve of a ductile material under large plastic deformation (include necking) by tracing the experimental tensile loading-axial displacement curve using computer simulation is suggested. According to this method, the tested load (P)-deformation (AL) curve of the tensile specimen is considered as a target, and the true stress-strain curve of the material will be obtained when the simulated curve P* -AL* is completed using a large elastic-plastic deformation finite element program, by adjusting the trace of the stress-strain curve step by step according to the relative error of the simulated curve P* -AL* with the test one P-AL, under the condition that the relative error is controlled less than a given limit value.

As a verification, in this paper, the method is applied to analyse the large deformation necking process of round smooth tensile specimen made of No. 45 steel.