摘要
运用引入应力比的郑修麟应力寿命公式和三参数幂函数公式,将应变疲劳失效的两个驱动力-应变范围Δε和应变比Rε的作用效果进行耦合,建立"双驱动力耦合"力学模型。通过这一模型,能够得到准确描述不同应变比条件下应变行为的统一表征方程,为其他应变比下的寿命预测提供参考。试验表明,"双驱动力耦合"力学模型能很好地描述ZTC4在室温下Rε=-1、0.1和0.5的应变疲劳行为。
A method called ＂two driving powers coupling＂is presented, which establishes a formula to represent strain-fatigue behavior under different tested strain ratios and provides reference for life prediction with other strain ratios. The method combines the effects of sWain range Ae and strain ratio R 8 on strain-fatigue failure by means of Zheng stress-fatigue formula and a formula of three-parameter power function. Aε and R, are considered as two driving powers of strain-fatigue. The unified token formula of sWain-fatigue behavior is exactly represented with this method under different strain ratios. The method is tested well in ZTC4 alloy at room temperature and Rε=-1,0.1 and 0.5.
出处
《热加工工艺》
CSCD
北大核心
2012年第13期10-12,共3页
Hot Working Technology
