摘要
基于Manson-Coffin方程处理低周应变疲劳应变-寿命曲线，提出了一种在短寿命区用低周应变疲劳试验数据，长寿命区（5000周～50000周）用高周疲劳试验数据联合确定材料的高温低周应变疲劳应变-寿命曲线的方法。联合处理方法的应用将不再需要进行应变控制的长寿命小应变的疲劳试验，节约了试验经费，缩短了试验周期。用GH141合金760℃的低周应变疲劳和高周疲劳数据对该方法进行了验证，验证结果发现：联合处理方法和单纯的Manson-Coffin方程处理得到的应变-寿命曲线吻合很好。联合处理方法可以用来确定高温低周应变疲劳应变-寿命曲线。
Based on Manson-Coffin equations of low cycle fatigue （LCF） under strain controlled to acquire strain-life curve, a new technique for determining strain-life curve of LCF is developed. When fatigue life is shorter than 5000 cycles, experimental data of LCF under strain controlled are used. But when fatigue life is longer than 5000 cycles, experimental data of high cycle fatigue （HCF） under stress controlled are employed. This new method of combining LCF with HCF allows to avoid long fatigue life with small strain test under strain controlled, thus test expenses may be saved and test time shortened. Experimental data of LCF and HCF are reduced by new method for superalloy GH141, at temperature 760℃. Strain-life curves obtained by simply Manson-Coffin equation and by new method are in good agreement. The new method combining by LCF with HCF can be used to get strain-life curve of LCF.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2006年第5期867-873,共7页
Journal of Aerospace Power
关键词
航空
航天推进系统
低周疲劳
寿命
高周疲劳
aerospace propulsion system
low cycle fatigue （LCF）
life
high cycle fatigue （HCF）
