Transactions of Materials and Heat Treatment

Title：Numerical simulation of influence of punch diameter on limit bulging properties for tailored welded blanks

Authors： Chen Shuisheng Sun Dongji

Unit： Henan Polytechnic University Shanghai General Motors Co. Ltd.

KeyWords： tailor welded blanks punch diameter limit bulging height limit strain critical diameter

ClassificationCode：TG386

year,vol(issue):pagenumber：2015,40(8):41-46

Abstract：

To probe the reasonable punch diameter D from the limit bulging height (LBH) test, the influence of D on the formability of tailor welded blanks (TWBs) was discussed by the experiment and finite element (FE) method. In the model of TWBs，the weld was treated independent part and given with the weld properties and the width. The friction coefficient between tools and TWBs was determined by comparison of the load-displacement curves of the experiments with that of the simulations. The established FE model was proved to be available by comparing the limit bulging height and the crack location in the experiment with that in the simulation. The influences of D on the relative LBH and the limit strain were analyzed based on the FE model. The results indicate that when TR is large, D has significant effect on the formability of TWBs; otherwise, D has little effect. There is a critical value for D. When D exceeds the critical value, the forming formability of TWBs maintains steady. When the friction coefficient is 0.08, critical value D in the limit bulging test is 100 mm for the cold rolled galvanized sheet and tailor welded blanks with a larger TR.

Funds：

河南省教育厅科学技术研究重点项目(14A460013); 河南省科技攻关计划资助项目(142102210130)

陈水生（1978-），男，博士，讲师

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