摘要
分析了材料疲劳寿命曲线在三个阶段内的变化特性,提出了一个描述材料全寿命区域内疲劳寿命曲线的三参数模型。该模型中的三个参数分别反映了材料的疲劳极限、韧性以及特征疲劳寿命,同时给出了求解这些参数的方法。通过对载荷的量纲一化处理,该模型可以描述材料的应力-寿命曲线和应变-寿命曲线。对金属材料和复合材料的19条应力/应变-寿命曲线进行了统计分析,结果表明该模型可以描述材料的全寿命曲线。
The characteristics of fatigue life curve of materials in three stages of fatigue life were analyzed and then a model with three parameters was presented to describe the fatigue life curve of materials in the whole region.Three parameters quantitatively describe the fatigue limit,the toughness and the characteristic fatigue life of material in the model and a convenient method to obtain the parameters was mentioned.The model can describe the strain-life curve as well as stress-life curve of materials by the normalized loading.Nineteen sets of experimental data of metals and composites were employed to verify the model,and the results show that the model is capable to describe the fatigue life curve of materials in whole region.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2008年第13期1634-1637,共4页
China Mechanical Engineering
