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总结了拉伸超载对低碳低合金钢及其焊接件疲劳性能的影响的实验结果,并据此提出了寿命估算模型。本文的实验结果再次表明,载荷谱中的大、小载荷交互作用可用超载效应予以定量地表征。低碳低合金钢切口试件和焊接件的超载效应接近于零,因而可用 Miner 定则和裂纹起始寿命曲线估算变幅载荷下的始裂寿命,无需考虑载荷交互作用。对于光滑试件超载产生负效应,因而在寿命估算时应考虑载荷交互作用效应和载荷顺序效应。
The experimental results of the influence of tensile overload on the fatigue properties of low carbon low alloy steel and its welded parts are summarized, and the life estimation model is proposed. The experimental results in this paper show again that the large and small load interactions in the load spectrum can be quantitatively characterized by the overloading effect. The overloading effect of low-carbon and low-alloy steel notched specimens and welded parts is close to zero. Therefore, the Miner’s rule and initial crack initiation life curve can be used to estimate the initial crack life under fluctuating loads without considering the load interaction. For the negative effects of overloading the smooth specimen, the load interaction effect and the load sequence effect should be considered in the life estimation.