镍基单晶合金切口圆棒试样三维晶体弹塑性应力场的数值模拟

Three Dimensional Crystallographic Numerical Stress Analysis of Notched Bars of Nickel-based Single Crystal Superalloys

建立了镍基单晶切口试样的三维晶体弹塑性有限元模型 ,研究了不同尺寸的“U”型和“V”型切口试样的应力分布和滑移系开动特性 ,给出了八面体分切应力沿切口截面径向和周向的分布情况。结果表明切口尺寸对分切应力有显著影响 :对于这两种类型切口 ,随着切口半径的减小 ,最大分切应力增加 ,并且切口半径越小 ,分切应力沿切口截面周向波动的幅度越大 ;相应的开动滑移系也不同。

Different U-type and V-type notched bars of nickel-based single crystal were investigated with the [001] tensile orientation by using the finite element method.The Von Mises stress characteristics and resolved shear stress distributions of the slip systems were given.The results show that the notch size has strong influence on the resolved shear stress.To the two type notches studied,the resolved shear stress increases with the decreasing of the notch radii,as well as does the resolved shear stress along the circle of the specimens.It is found that the activated slip systems in the notch section are different for different size of the notch of the specimens.