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近年来,一些复杂的各向异性屈服函数被广泛地用来描述各种先进材料塑性成形过程中的屈服行为。这类复杂屈服函数需要标定的参数多,部分力学性能测试实验复杂且参数不易获取。基于单向拉伸实验数据,提出先通过优化方法标定简单各向异性屈服函数(Hill48或Barlat91),通过其理论预测出复杂屈服函数标定所需的力学性能参数,并代替真实实验值完成复杂屈服函数的标定。以常用的Yld2000-2d和BBC2005屈服函数为例,对比分析了不同标定方法对屈服函数预测不同取向时的厚向异性系数、屈服应力以及屈服面的影响规律。通过与不同材料常规标定方法的对比分析,验证了所提出方法的可行性。
In recent years, some complex anisotropic yield functions have been widely used to describe the yield behavior of various advanced materials in plastic forming. Such complex yield functions require more parameters to be calibrated, and some of the mechanics performance tests are complex and difficult to obtain parameters. Based on the experimental data of uniaxial tensioning, the simple anisotropic yield function (Hill48 or Barlat91) is first calibrated by the optimization method, and the mechanical performance parameters required for the calibration of the complex yield function are predicted by its theory. The complex yielding Function calibration. Taking Yld2000-2d and BBC2005 yield functions as examples, the influences of different calibration methods on the yield anisotropy coefficient, yield stress and yield surface in different orientations of yield function were analyzed. By comparing with the conventional calibration methods of different materials, the feasibility of the proposed method is verified.