摘要
提出另一种循环总应变能密度疲劳寿命预测方法，根据不同的应力比，给出对疲劳损伤起作用的循环总应变能密度计算表达式。针对应力控制下的脉动循环试验，设计两种加载方式把循环蠕变对寿命的影响与疲劳的影响区别开，将循环蠕变损伤与疲劳损伤进行线性累积，得到16MnR钢420℃兼有疲劳、循环蠕变影响的寿命预测方法，预测结果与实测结果吻合良好。将循环蠕变对寿命的影响扣除在外，得到16MnR钢375℃～420℃之间的疲劳设计曲线，对JB4732—95疲劳设计曲线作有益的补充。
An alternative total strain energy density life prediction criterion is proposed. Calculation equations of total strain energy density contributing to fatigue damage are given for different stress ratios. Based on pulsating cyclic test technique under stress control, two test methods are designed to distinguish the effect of cyclic creep from the effect of fatigue on life. Cyclic creep damage and fatigue damage are accumulated by linear damage summation models and life prediction method of 16MnR at 420℃ is obtained to predict the life with both effects of eyelie creep and fatigue. Comparison between theoretical predictions and test results is found to be quite satisfactory. By deducting effect of eyelie creep, fatigue design curve of 16MnR steel at 420℃ is established, which is complementary to fatigue design curve of JB 4732-95.
出处
《机械强度》
CAS
CSCD
北大核心
2006年第3期387-391,共5页
Journal of Mechanical Strength
基金
国家"十五"科技攻关专题资助(2004BA803B02-06)。~~
关键词
应力控制
循环蠕变
寿命预测
疲劳设计
Stress control
Cyclic creep
Life prediction
Fatigue design
