Correction of structural stress method for fatigue test of T-joint
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摘要: 为了更为精确地预测焊接结构的疲劳寿命，基于承载T形焊接接头的疲劳试验，建立有限元分析模型，50%存活率下，分别采用Verity法的位移控制模型、载荷控制模型、VOLVO法等结构应力法对T形焊接接头疲劳寿命进行寿命预测，结果表明，Verity法的载荷控制模型计算结果偏安全，VOLVO法计算结果偏危险，Verity法的位移控制模型计算结果与实际最为接近。而后，基于试验数据，修正了VOLVO法的柔性S-N曲线，采用该修正模型的计算结果可以较为精确地反映工程实际。Abstract: In order to predict the fatigue life of the welded structure more accurately,a finite element analysis model was established based on the fatigue test of T-joint. At the 50% survival rate,the displacement control model of verity method,the load control model of verity method,and the VOLVO method were adopted respectively to predict the fatigue life of the T-joint. It is shown that the calculate results of the load control model of verity method are more safe and the results of VOLVO method are more dangerous. The results of the displacement control model of verity method are the closest to the actual ones. Then,based on the test data,the flexible S-N curve of the VOLVO method was revised,and the results of the modified model can reflect the actual project accurately.
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