TA2纯钛板的成形极限

为了探究TA2纯钛板的成形极限,通过电化学腐蚀方法印制网格,在室温下使用BCS-50AR板材试验机分别对厚度为0.5和0.8 mm的TA2纯钛板进行了Nakizima胀形试验。通过网格分析系统采集网格的畸变,获得材料的主、次应变,并绘制了TA2纯钛板在室温下的成形极限图。根据单位体积塑性功相等的原理改进了Hill48屈服准则,并求出了TA2纯钛板对应的各向异性系数。将M-K失稳准则和改进的Hill48屈服准则相结合,对TA2纯钛板的成形极限进行了理论预测,理论预测结果与试验结果基本吻合,但整体略低于试验结果。所做研究对于今后板料成形极限的研究提供了重要的研究方法,并且对实际生产具有着重要的工程应用价值。

Forming limit on TA2 titanium sheet

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-50 AR 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.