EXPERIMENTAL AND NUMERICAL STUDY ON THE MICRO-FORMING OF COPPER MULTI-CRYSTAL
In the micro-forming process,as the quantity of the grains involved in deformation is limited,the material becomes obvious heterogeneous,and the phenomenological elasto-plastic model is not suitable to this case.As a result,the study should be based on the material microstructure and deformation mechanism.This paper implemented a micro-deep drawing experiment with pure copper blanks,which consisting of several grains,investigated the grains deformation feature and drawing force,and then simulated deep drawing process of this kind of material by building a full inhomogeneous polycrysta1line models and developing a material subroutine (VUMAT),which based on crystalline plasticity constitutive.The three-dimensional brick element was adopted to build-up the finite element model,and the contact and friction between the blank and tool were taken into consideration.The simulations has a good agreement with the experiments which show that remarkable earing occurs during the deep drawing of the inhomogeneous material,but the ears are lack of regular pattern.
Micro-forming Deep drawing Crystal plasticity Heterogeneous materials Earing
XiaoLiang Geng KeShi Zhang YunQiang Guo Liang Qin
Northwestern Polytechnical Universtiy,Xian Shaanxi,710072,China Northwestern Polytechnical Universtiy,Xian Shaanxi,710072,China;Guangxi University,Nanning,Guangxi
国际会议
第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)
安徽黄山
英文
183-189
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）