Mechanical behavior of sheet metals up to rupture - Applications to bending and hemming
讲座名称：
Mechanical behavior of sheet metals up to rupture - Applications to bending and hemming
讲座时间：
2013-09-24
讲座人：
Sandrine Thuillier
形式：
校区：
兴庆校区
实践学分：
讲座内容：
应机械工程学院臧顺来副教授的邀请，法国Universite de Bretagne-Sud的Sandrine Thuillier教授和Pierre-Yves Manach教授来访我校，访问期间将举行学术报告。
讲座题目一：Mechanical behavior of sheet metals up to rupture - Applications to bending and hemming
讲座时间：2013年9月24日（周二）下午3:00-3:40
讲座地点：机械工程学院第三会议室
讲座人：Sandrine Thuillier教授
讲座简介：
This presentation is focused on the mechanical behavior of sheet metals up to rupture, at
room temperature and in quasi-static regime. Experiments have been conducted on two materials,
an aluminium alloy AA6016 and a dual phase steel DP980. The hardening of these materials has
been characterized as well as the maximum strain at rupture, by mechanical testing in tension,
simple shear, biaxial tension (bulge test) and bending, with local strain measures using a Digital
Image Correlation technique. Ductile failure was evidenced with SEM observations, in order to
check the first occurrence of cracks. Moreover, the void volume fraction has been investigated by
X-ray microtomography for different triaxiality ratios.
Finite element simulations, based on Gurson-Tvergaard-Needleman model, extended to the
case of plastic anisotropy described by Hill’s 1948 yield criterion, were performed with Abaqus.
The parameters were identified by inverse analysis and by using finite element simulations for
inhomogeneous tests ; a critical void volume fraction was then determined. Applications concern
bending and hemming, and both macroscopic rupture criteria and critical void volume fraction
were used.
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