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钣金机匣作为航空发动机的主要构成零部件,其结构复杂、材料难于成形,且成形后内部存在不同程度的残余应力,随着计算机的发展,数值模拟成为辅助板料成形研究的主要手段,屈服准则是数值模拟的基础。本文对航空发动机机匣钣金成形性能做以叙述,对各向同性材料屈服准则、各向异性材料屈服准则、先进的各向异性材料屈服准则进行归纳,提出屈服准则应以屈服轨迹、单轴屈服应力、塑性各向异性参数等为选择依据,并提出未来屈服准则可沿新的屈服准则、描述非线性加载情况下的屈服轨迹、创新实验研究方法等方向发展。
As the main components of aeroengine, sheet metal casing has complex structure, difficult to form materials, and different residual stresses in the interior after forming. With the development of computer, numerical simulation has become the main method to assist sheet metal forming. Yield criterion is the basis of numerical simulation. In this paper, the formability of the aero-engine casing sheet metal is described. The yield criterion of isotropic material, yield criterion of anisotropic material and the yield criterion of advanced anisotropic material are summarized. It is suggested that the yield criterion should be based on yield trajectory, Yield stress and plastic anisotropy are the basis of choice. It is also proposed that the future yield criterion can be developed along the new yield criterion, the yield trajectory under the condition of nonlinear loading, and the innovative experimental research methods.