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.
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