弹性模量对低周疲劳性能参数的影响
Effect of Elastic Modulus on Parameter of Low Cycle Fatigue Performance
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摘要: 对材料1C r11N i2W 2M oV进行了500℃的等温低周疲劳试验和静力拉伸试验。考察了静力拉伸弹性模量与动态弹性模量的差别,以及弹性模量对该材料等温低周疲劳性能参数的影响。结果表明:当循环寿命较大(Nf大于5 000周)时弹性模量对等温低周疲劳寿命预测的精确度有较大的影响,分散带的大小有数量级的差别,应该采用疲劳试验机测出的弹性模量对等温低周疲劳寿命进行预测。Abstract: Low cycle fatigue tests and static tension tests were performed for steel 1Cr11Ni2W2MoV,with air temperature of 500℃.The difference between static elastic modulus and dynamic elastic modulus was investigated.The effects of elastic modulus on parameter of low cycle fatigue were studied also.When fatigue life is longer than 5 000 cycles,the results of fatigue life prediction showed that elastic modulus affected the precision of fatigue life prediction to a great extent,and there was large difference in scatter band.It is necessary to use elastic modulus measured in fatigue machine to predict low cycle fatigue life.
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Key words:
- aerospace propulsion system /
- elastic modulus /
- scatter band /
- fatigue /
- life
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