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在BHB-80板料双向拉伸试验机上,对厚度分别为0.8,1.0和2.0 mm的工业纯钛TA1薄板进行了室温条件下的杯突试验。试验结果表明,3种厚度TA1薄板的杯突值(IE值)分别为11.00,11.10和11.90 mm,并且随着板料厚度的增加,杯突值随之增加。此外,在试验基础上利用有限元分析软件对TA1板的成形过程进行数值模拟,采用最大凸模力准则获得了虚拟的杯突值,分析了变形过程中等效应变的分布,并预测了试件开裂的部位。模拟结果表明,虚拟杯突值要小于试验获得的杯突值,但不改变板厚对杯突值的影响规律;随着变形增加,最大等效应变区发生转移;预测的开裂部位与试验结果一致。
On the BHB-80 sheet biaxial tensile testing machine, cup test was carried out on commercial pure titanium TA1 sheets with thickness of 0.8, 1.0 and 2.0 mm respectively at room temperature. The test results show that the cup protrusion values (IE values) of the three kinds of thickness TA1 sheets are respectively 11.00, 11.10 and 11.90 mm, and as the sheet thickness increases, the cup protrusion value increases accordingly. In addition, the finite element analysis software was used to numerically simulate the forming process of TA1 plate. The maximum cup force criterion was used to obtain the virtual cup projection. The distribution of equivalent strain in the deformation process was analyzed. Cracking site. The simulation results show that the sudden drop of the virtual cup is smaller than that obtained by the test but does not change the influence law of the plate thickness on the cup sudden. As the deformation increases, the maximum equivalent strain zone shifts. The predicted cracked part and the test result Consistent.