Transactions of Materials and Heat Treatment

Title：Influence principles of formability for linear-weld-line tailor-weld blanks with different thicknesses of base metals

Authors： Gan Yong Wang Hanchao Wu Jianwei Li Hongzhao

Unit： Guilin University of Electronic Technology

KeyWords： Dome test numerical simulation different thicknesses formability

ClassificationCode：TG386

year,vol(issue):pagenumber：2014,39(8):119-124

Abstract：

After using Dynaform numerical simulation techniques, on the basis of reliability of simulation model verified, Dome test of the same material tailor welded blanks with different thicknesses was carried out. During the Dome test of blanks, the influence of both sides of base metal with different thicknesses on limiting dome height, the maximum weld-line movement and strain distribution was analyzed. And using the genetic algorithm to fit the experimental data, the mathematical expressions between the changing thickness of base metal and limiting dome height, the maximum weld-line movement were proposed. Using the GUIDE module of MATLAB, the human-computer interaction interface was built. Studies show that there is a negative correlation between limit forming height and thickness ratio, while there is a positive correlation between the maximum weld-line movement and thickness ratio when the thinner side thickness value is fixed. But, when the thickness value of thicker side is fixed, the principle is no longer applicable. At this point, the thickness of thinner side and the average thickness have a great influence on the forming process. In addition, with the increasing of thickness ratio, the stress focuses on the thinner side, and the fracture location shifts towards the weld. When the thickness ratio is above 1.7, the forming process gets instable. Therefore, the thickness of tailor-weld blanks (TWBs) should be chosen reasonably to improve their forming ability.

Funds：

广西自然科学基金项目（2013GXNSFAA019298）

甘勇（1973-），男，博士，教授；王瀚超（1989-），男，硕士研究生

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