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结合Ni基单晶合金制三种不同晶体取向的紧凑拉伸试样试验,本文利用考虑有限变形和品格转动效应的晶体滑移有限元程序对单晶体三维断裂特征进行了模拟计算分析,详细考察了裂纹尖端三维应力场特征和断裂特征,结果表明:晶体取向对裂纹尖端应力场有较大影响,但应力沿试样厚度方向明显分成两个部分,在试样心部,应力沿厚度方向变化不大,在试样外表面则明显变化。裂纹尖端张开位移(CTDD)沿厚度方向类似分成两个部分。垂直于滑移面的应力分量致单晶体的准解理断裂,即裂纹的起裂和扩展途径均与该应力分量有关。
In this paper, the three-dimensional fracture characteristics of single crystals were simulated and analyzed by using the finite element program of finite element method and finite element method. The detailed analysis of the three- The results show that the crystal orientation has a great influence on the stress field at the tip of the crack, but the stress is obviously divided into two parts along the thickness direction of the specimen. In the center of the specimen, the stress changes along the thickness direction Large, the outer surface of the sample is significantly changed. The crack tip open displacement (CTDD) is similarly divided into two parts in the thickness direction. The quasi-cleavage fracture of single crystals caused by the stress component perpendicular to the slip plane, ie, the initiation and propagation of cracks, is related to the stress component.