航空发动机机匣钣金成形及屈服准则

Forming and Yield Criteria of Sheet Metals for Aero-engine Casings

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。

Sheet metal casings,main components of aero-engines,have the following features： complex structure,difficult forming of material and internal residual stress after forming. With the development of computer,numerical simulation has become a main auxiliary means of sheet forming,and yield criterion is the foundation of numerical simulation. The forming performances of sheet metals for aero-engine casings were introduced,yield criteria of isotropic and anisotropic materials were summarized. It is assumed that yield criteria should be based on yield locus,uniaxial yield stress and plastic anisotropy parameters. It is pointed out that the future yield criteria may be developed according to new yield criterion,yield locus under nonlinear loading,and innovative experimental method.