Transactions of Materials and Heat Treatment

Title：Forming limit on TA2 titanium sheet

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ClassificationCode：TG146.23

year,vol(issue):pagenumber：2021,46(1):43-49

Abstract：

In order to explore the forming limit of TA2 titanium sheet, the grid was printed by electrochemical etching method, and the Nakizima bulging test was conducted on TA2 titanium sheet with the thickness of 0.5 and 0.8 mm respectively by BCS-50AR sheet tester at room temperature. Then, the primary and secondary strains of material were obtained by the grid analysis system to collect the mesh distortion, and the forming limit diagram of TA2 titanium sheet at room temperature was drew. Based on the principle of equal plastic work per unit volume, the yield criterion Hill48 was improved, and the anisotropy coefficient of TA2 titanium sheet was obtained. Furthermore, the forming limit of TA2 titanium sheet was theoretically predicted by combining the instability criterion M-K and improved yield criterion Hill48, and the theoretical prediction results were basically consistent with the experimental results, but the overall result was slightly lower than that of the experimental simulation. Thus, the research provides an important research method for the forming limit of sheet in the future and has important engineering application value for the actual production.

Funds：

基金项目:国家自然科学基金资助项目（51475003）；北京市自然科学基金-北京市教委联合资助项目（KZ202010009014）；北京市属高等学校青年拔尖人才培育计划（CIT&TCD201704014）

作者简介：阎昱（1983-），女，工学博士，副教授 E-mail：anneyan@126.com

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