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采用普通工业TC4板料,在MTS高温拉伸试验系统上进行了不同变形条件的恒速拉伸试验,研究材料的高温变形行为。分析了5类通用高温本构关系对该材料真实应力应变曲线的拟合情况。最终,采用经典的Kumar模型建立了TC4的高温本构关系。利用MARC分析TC4机身盒形零件的气压成形过程,依据正交试验原理确定FEA仿真方案,并对成形模具进行了设计。以壁厚标准差为评价指标,采用极差分析法确定各因素对指标的影响程度和最佳工艺参数,并通过气压成形试验获得满足质量要求的零件。
The common industrial TC4 sheet was used to carry out constant speed tensile test under different deformation conditions on MTS high temperature tensile test system to study the high temperature deformation behavior of the material. The fitting of five general high temperature constitutive relations to the real stress-strain curve of the material was analyzed. Finally, the classical Kumar model was used to establish the high-temperature constitutive relationship of TC4. Using MARC to analyze the forming process of TC4 fuselage box parts, the FEA simulation program was established according to the principle of orthogonal test, and the forming mold was designed. Taking the standard deviation of wall thickness as the evaluation index, the range analysis method was used to determine the degree of influence of each factor on the index and the optimum technological parameters. The parts meeting the quality requirements were obtained by the air pressure forming test.