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对ＣＤ３５０钻杆吊卡三维应力场进行了分析，进而采用有限元位移法求解危险截面处不同深度和不同形状表面角裂纹的应力强度因子。在大量有限元计算的基础上，拟合出关于角裂纹特征参数的无量纲应力强度因子表达式，为预测带裂纹的钻杆吊卡的承载能力、剩余寿命，确定探伤周期、制定判废标准等提供了必要的断裂分析参数。
The 3D stress field of the CD350 drill pipe elevator was analyzed. Then the finite element displacement method was used to solve the stress intensity factor of different depths and different shapes of surface corner cracks at the dangerous section. On the basis of a large number of finite element calculations, the dimensionless stress intensity factor expression for the characteristic parameters of the angular crack is fitted out. In order to predict the bearing capacity and remaining life of the cracked drill pipe elevator, Provide the necessary fracture analysis parameters.