摘要
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.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2004年第2期179-183,共5页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目 (50 0 0 0 50 1 6)
航空科学基金(0 2C530 1 1 )资助项目
教育部留学回国人员基金资助项目
关键词
镍基单晶合金
数值模拟
切口圆棒试样
弹性应力场
塑性应力场
Nickel-based single crystal superalloys
notched specimens
three dimensional crystallographic model
stress analysis