A New Ductile Fracture Criteria Applied to Various Deformation Conditions Based on Micro-void Model

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Abstract To accurately predict the occurrence of ductile fracture in metal forming processes, the Gurson-Tvergaard (GT) porous material model with optimized adjustment parameters is adopted to analyze the macroscopic stress-strain response, and a practical void nucleation law is proposed with a few material constants for engineering applications. The mechanical and metallographic analyses of uniaxial tension, torsion and upsetting experiments are performed using specimens with different geometries. According to the character of the metal forming processes, the basic mechanisms of ductile fracture are divided into two modes: tension-type mode and shear-type mode. The corresponding fracture criteria are put forth for wide applicable range, and the comparison of experimental results with numerical analysis results confirms the validity of the newly proposed ductile fracture criteria based on the GT porous material model.

Key words�� ductile fracture metal forming processes void nucleation mechanical and metallographic analyses

Received: 24 March 2008

Corresponding Authors: Jian-ke HUANG

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	Jian-ke HUANG Xiang-huai DONG

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Jian-ke HUANG Xiang-huai DONG. [J]. Chinese Journal of Iron and Steel, 2009, 16(5): 92-92.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2009/V16/I5/92