Fatigue Life Estimation of Specimen under Spectrum LoadUsing Fuzzy Miners Rule
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摘要: 在载荷谱中,当疲劳应力稍低于疲劳极限时,对构件是否造成损伤呈现出某种"模糊"过渡状态.运用模糊数学的隶属函数,建立了考虑"模糊"损伤状态的Miner法则.按照常规Miner法则和模糊Miner法则,分别给出了程序块谱作用下疲劳寿命的估算公式.实例估算与试验结果的对比表明:采用模糊Miner法则,可使疲劳寿命的估算误差减少18.33%.Abstract: Fatigue damage exhibits some "fuzzy" character when the fatigue stress in load spectrum is lower slightly than fatigue limit. A Miner-s rule considering this "fuzzy" damage character is established by means of membership function of fuzzy mathematics. When a specimen is subjected to programmed spectrum loads, the estimation formula of fatigue life is derived according to regular Miner's rule and fuzzy Miner's rule. Comparing the results of calculations and fatigue experiments, it is shown that the estimation error of fatigue life is decreased by 18.33% with using fuzzy Miner's rule.
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Key words:
- fatigue life /
- fuzzy variables /
- fatigue tests /
- membership function /
- estimation
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