考虑应变均值影响的天然橡胶隔振元件疲劳寿命预测

对橡胶试柱进行单轴疲劳试验，分析了应变幅值一定时，应变均值对疲劳寿命的影响。以哑铃型天然橡胶试柱为研究对象，通过有限元计算分析，得到了加载位移与橡胶试柱危险位置处最大主应变的关系。构建了应变均值函数，以应变比R=0时的 曲线为基准疲劳寿命曲线，建立了不同应变均值和幅值下的天然橡胶隔振元件的疲劳寿命预测模型。使用该模型预测得到的哑铃型天然橡胶试柱疲劳寿命与试验疲劳寿命具有较好相关性。文中提出的天然橡胶元件的疲劳寿命预测模型，可用于建立天然橡胶材料的疲劳寿命数据库。

Fatigue life prediction for a natural rubber anti-vibration component with mean strain effect

Uniaxial fatigue experiments for a rubber specimen is carried out, and mean strain effect on fatigue life under constant strain amplitude is analyzed. Taking dumbbell natural rubber specimen as study example, the relationship between the loading displacement and the maximum principal strain of the rubber specimen at critical position is determined by finite element analysis (FEA). A mean strain function is constructed, and fatigue life prediction model at different strain mean value and amplitude is established based on the curve of the natural rubber with 0 strain ratio. The predicted lives of dumbbell natural rubber specimen based on the model agreed well with the experimental fatigue lives. Fatigue life prediction model for natural rubber component presented in the paper is instructive for establishing fatigue life database of natural rubber.