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为了找到能够更好地预测材料低周疲劳寿命的方法,基于三参数幂函数公式,对引起材料疲劳损伤的原因进行分析,提出了描述损伤能密度与疲劳寿命关系的寿命预测模型。采用高温合金与钛合金等多种材料的低周疲劳试验数据对提出的模型进行分析验证,并将分析结果与传统的Masson-Coffin模型和三参数幂函数公式的分析结果进行对比。结果表明:所提出的损伤能密度模型对不同条件下的材料数据的拟合效果较好,七种不同条件下的材料数据拟合结果中,有六种的相关系数大于0.9,且所有条件下的寿命预测点都在2倍分散带以内,精度高于另两种模型,并且该模型能够确切地描述引起材料低循环疲劳损伤的原因,简洁明了。
In order to find out a better way to predict the low-cycle fatigue life of materials, the cause of material fatigue damage is analyzed based on the three-parameter power function formula, and the life prediction model describing the relationship between damage energy density and fatigue life is proposed. Low-cycle fatigue test data of a variety of materials, such as superalloy and titanium alloy, were used to verify the proposed model. The analysis results were compared with those of the traditional Masson-Coffin model and the three-parameter power function formula. The results show that the proposed model of damage energy density has a good fitting effect on the material data under different conditions. Among the seven different material fitting results, the correlation coefficients of six of them are greater than 0.9, and under all conditions Life expectancy points are within 2 times the dispersion zone, the accuracy is higher than the other two models, and the model can accurately describe the causes of low cyclic fatigue damage caused by the material, concise and clear.