FATIGUE CHARACTERISTICS OF CERTAIN ENGINE FAN BLADE UNDER HIGH-LOW CYCLE COMBINED LOADING

TANG Ling; SHANG BoLin; CHEN PengFei; GAO XingWei; YIN ZhiPeng

doi:10.16579/j.issn.1001.9669.2016.02.028

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FATIGUE CHARACTERISTICS OF CERTAIN ENGINE FAN BLADE UNDER HIGH-LOW CYCLE COMBINED LOADING

更新时间：2022-09-22

- FATIGUE CHARACTERISTICS OF CERTAIN ENGINE FAN BLADE UNDER HIGH-LOW CYCLE COMBINED LOADING
- Journal of Mechanical Strength Vol. 38, Issue 2, Pages: 374-379(2016)
- 作者机构：
  
  1. 空军工程大学航空航天工程学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2016.02.028
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TANG Ling, SHANG BoLin, CHEN PengFei, et al. FATIGUE CHARACTERISTICS OF CERTAIN ENGINE FAN BLADE UNDER HIGH-LOW CYCLE COMBINED LOADING. [J]. 38(2):374-379(2016)
DOI：

TANG Ling, SHANG BoLin, CHEN PengFei, et al. FATIGUE CHARACTERISTICS OF CERTAIN ENGINE FAN BLADE UNDER HIGH-LOW CYCLE COMBINED LOADING. [J]. 38(2):374-379(2016) DOI： 10.16579/j.issn.1001.9669.2016.02.028.

摘要

为了对某型发动机风扇叶片进行定寿工作,通过高低周复合疲劳试验,并对试验结果进行了统计分析,得到了该型叶片的疲劳特性曲线(S-N曲线、P-S-N曲线)。结果表明:当高周疲劳应力大于61.51 MPa时,该型叶片的S-N曲线满足二次函数规律,当小于61.51 MPa时,其高周次数达到了107以上,超过了一般金属材料的疲劳极限;在双对数坐标下,该叶片的S-N曲线为一次函数,满足线性规律;疲劳寿命在高应力水平下分散性较小,在低应力水平下分散性较大;该型叶片中值寿命(50%存活率)约为安全寿命(99.99%存活率)的2.5至5倍。

Abstract

In order to carry on life determination on certain engine fan blade,high and low cycle fatigue tests were conducted on several specimens. The fatigue characteristic curve（ S-N curve,P-S-N curve） was obtained by statistical analysis.The results show that the S-N curve of this blade meet the law of quadratic function when the high cycle stress is greater than61. 51 MPa. In contrast,the high cycle fatigue is over the fatigue limit of general metal. The service life is associated with high cycle stress linearly. The disparity of service life is lower under high stress,while it is higher under low stress. In addition,the median life is about 2. 5 ,5 times of the safety lfe（ the survival rate is 99. 99%）.

关键词

高低周复合疲劳风扇叶片有限元分析疲劳特性曲线疲劳寿命

Keywords

High-low cycle complex fatigueFan bladeFinite element analysisFatigue characteristic curveFatigue life

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School of Mechanical Engineering,Dalian University of Technology

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