确定高周应力疲劳S-N曲线的方法研究  

Method for Reducing Stress-life Curve of High Cycle Fatigue

作　　者：李骋[1] 张国栋[1] 许超[1] 苏彬[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《燃气涡轮试验与研究》2008年第2期39-43,共5页Gas Turbine Experiment and Research

摘　　要：基于三参数幂函数法处理高周疲劳S-N曲线,提出了一种在短寿命区采用低周疲劳试验数据、长寿命区采用高周疲劳试验数据联合确定材料高周疲劳S-N曲线的方法。联合处理方法的应用在有效利用低周疲劳数据、节约试验经费和缩短试验周期的同时,获得了理想的S-N曲线。用FGH95合金500℃和单晶合金DD3[001]取向850℃的高、低周疲劳数据对该方法进行了验证,结果表明:联合处理方法不仅在长寿命区与单纯用高周疲劳数据处理得到的S-N曲线吻合很好,而且将S-N曲线延伸到中、低寿命区,有效地保证了S-N曲线的完整,联合处理方法可以用来确定材料的高周S-N曲线。Based on three-parameter exponential function of high cycle fatigue （HCF） under stress controlled to acquire stress-life curve, a new method for determining stress-life curve with HCF data used in a long-life region and low cycle fatigue （LCF） data in a short-life region was developed. The new method effectively saved the test expenses and also shortened the test time. HCF and LCF data of powder Metallurgy Superalloys FGH95 at 500℃ and DD3[001] at 850℃ were used for demonstration. Results proved tat the stress-life curves obtained by new method was good in long life region, and extended the S-N curve to middle and short-life regions. The new method combining by HCF with LCF can be used to get stress-life curve of HCF.

关 键 词：高周疲劳 S-N曲线 低周疲劳 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程]