【摘要】 通过不同应力水平下的全场疲劳试验,测得材料的剩余强度,并拟合成函数曲线.在S N曲线可由对数或双对数方程表达的情况下,由剩余强度函数和后继加载参数确定出剩余S N曲线上的两点,从而确定剩余S N曲线.这种S N曲线移动法是由S N曲线的平动加绕后继加载点的转动构成的.该寿命分析模型能很好地反映加载的顺序效应.研究结果表明,二级和三级加载试验与预测寿命较接近,说明该模型基本符合实际.更多还原

【Abstract】 The residual strength of materials was measured by fatigue loading experiments under various stresses, and a residual strength curve was fitted according to the test data. In the common case of expression of the SN curve with logarithmic linear or double logarithmic linear equations, two points on the residual SN curve can be determined by the residual strength function and the succeeding loading parameters, therefore the SN curve can be determined. The SN curve displacement method was developed based on the translation and rotation of the SN curve around the succeeding loading point. The research shows that the life analytical model well reflects the loading sequence effect, and that two and threestage loading experimental results are well consistent with the predicted results, indicating that the life prediction model is basically accordant with the reality.更多还原