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采用率相关晶体滑移有限元程序,考虑单晶材料晶体取向的影响,对镍基单晶合金涡轮叶片榫头裂纹特性进行有限元分析.分别计算了榫头裂纹在各向同性条件以及{001},{011},{111}三种不同晶体取向下裂纹尖端的Mises应力分布,并判断了裂纹的扩展趋势.结果表明:镍基单晶合金涡轮叶片在{001}[110],{011}[110],{111}[110]取向下的裂纹尖端均存在着明显的应力集中和较大的应力梯度,应力的最大值存在于裂纹尖端;{001},{011},{111}三种不同晶体取向的裂纹尖端的扩展开裂角分别为45°,54.7°,90°,说明镍基单晶合金涡轮叶片的裂纹扩展趋势受晶体取向的影响较大.
By using the rate-dependent finite element method of crystal sliding, considering the influence of the crystal orientation of the single crystal material, the crack characteristics of the tenon of the nickel-based single crystal alloy turbine blade were analyzed by Finite Element Method (FEM) {001}, {111}, {111} and {111}, respectively, the Mises stress distribution at the tip of the crack under three different crystal orientations of {011} and {111} 110] and {111} [110], there are obvious stress concentration and large stress gradient in the crack tip. The maximum stress exists at the tip of the crack. Three kinds of {001}, {011} and {111} The crack initiation angles of crack tip with different crystal orientations are 45 °, 54.7 ° and 90 °, respectively, which shows that the crack growth tendency of the turbine blade of Ni-based single crystal alloy is greatly influenced by the crystal orientation.