| 考虑裂纹形状变化的TC4钛合金振动疲劳裂纹扩展寿命预测 |
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| 引用本文： | 杨硕,张俊红,林杰威,付曦,寇海军.考虑裂纹形状变化的TC4钛合金振动疲劳裂纹扩展寿命预测[J].航空动力学报,2016,31(10):2353-2358. |
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| 作者姓名： | 杨硕 张俊红 林杰威 付曦 寇海军 |
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| 作者单位： | 天津大学 内燃机燃烧学国家重点实验室, 天津 300072 |
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| 基金项目： | 高等学校博士学科点专项科研基金（20130032130005）；天津市科技支撑计划重点项目（13ZCZDGX00200） |
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| 摘 要： | 对TC4板材试件进行振动疲劳裂纹扩展试验，测得裂纹扩展寿命与裂纹长度之间的关系.使用超景深显微镜对裂纹形状进行观测和分析，拟合裂纹形状参数.将拟合表达式应用于应力强度因子幅值的计算中，并对裂纹扩展寿命进行预测.结果显示:裂纹形状参数对预测结果影响较大.当该参数取定值时，预测结果与试验结果误差较大.而所拟合的拟合表达式可以简单、准确地预测裂纹扩展寿命.
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| 关 键 词： | TC4钛合金 振动疲劳 裂纹扩展 裂纹形状 寿命预测 |
| 收稿时间： | 2015/1/22 0:00:00 |
Vibration fatigue crack growth life prediction of TC4 titanium alloy by considering the influence of crack shape |
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| YANG Shuo,ZHANG Jun-hong,LIN Jie-wei,FU Xi and KOU Hai-jun.Vibration fatigue crack growth life prediction of TC4 titanium alloy by considering the influence of crack shape[J].Journal of Aerospace Power,2016,31(10):2353-2358. |
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| Authors: | YANG Shuo ZHANG Jun-hong LIN Jie-wei FU Xi and KOU Hai-jun |
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| Institution: | State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China |
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| Abstract: | Based on the tests about vibration fatigue crack growth of TC4 plate, the relationship between crack growth life and crack length was got. Using the ultra-depth microscope to observe and analyze the crack shape, the crack shape parameter was fitted. The fitted parameter was applied to calculate the stress intensity factor range and predict the crack growth life. Comparing the test results with prediction results, it showed that the crack shape parameter greatly influenced the predicting results. When the parameter was given a constant value, the error between the prediction and tested results was large. However, the fitted crack shape parameter can be used to predicted the crack growth life much more conveniently and accurately. |
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| Keywords: | TC4 titanium alloy vibration fatigue crack growth crack shape fatigue life prediction |
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