热振环境下钛合金薄壁结构疲劳寿命

揭小落; 李丽远; 胡由宏; 谢学多; 吴彦增

doi:10.13224/j.cnki.jasp.20210422

热振环境下钛合金薄壁结构疲劳寿命

doi: 10.13224/j.cnki.jasp.20210422

中国航天科技集团有限公司中国运载火箭技术研究院北京强度环境研究所，北京 100076

基金项目: 国家自然科学基金青年科学基金（12002055）

详细信息

作者简介:
揭小落（1994-），女，工程师，硕士，主要从事热振试验技术研究

中图分类号: V416.3；O212；TH123
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出版历程
- 收稿日期: 2021-08-08
- 网络出版日期: 2022-09-05

Fatigue life of titanium alloy thin-walled structure under thermal vibration environment

Beijing Institute of Structure and Environment Engineering, China Academy of Launch Vehicle Technology, China Aerospace Science and Technology Corporation, Beijing 100076，China

摘要

摘要:
由于钛合金薄壁结构长时间在飞行热振环境下结构内部产生不断变化的应力，可能引起结构疲劳失效，因此借助振动试验台搭建了高温振动疲劳测试系统，测定了20、150 ℃和300 ℃温度条件下钛合金悬臂薄板结构的随机振动S-N疲劳曲线，并建立了上述温度条件下钛合金悬臂薄板结构的疲劳寿命预测表达式，根据其计算得到的预测寿命与试验件的实际寿命相比误差较小，300 ℃、45.36 MPa应力水平下误差仅为3.76%。该方法可用于高温随机振动载荷作用下结构的疲劳性能和寿命预测研究。
- 热环境 /
- 钛合金 /
- 薄壁结构 /
- 振动疲劳 /
- 寿命预测
Abstract:
Titanium alloy thin-walled structures are in the thermal vibration environment for a long time. The constantly changing stress produced in the thermal vibration environment may cause structural fatigue failure. A high temperature vibration fatigue testing system was built with the help of vibration test bench, and the random vibration S-N fatigue curves of titanium alloy cantilever thin plate structure were obtained at 20, 150 ℃ and 300 ℃. The fatigue life prediction expression of titanium alloy cantilever thin plate structure at the above temperature was established, and the error between the predicted life and the actual life of the test piece was small, which was only 3.76% at the condition of 300 ℃, 45.36 MPa stress level. The method can be used to study the fatigue performance and life prediction of structures under high temperature random vibration loads.
- thermal environment /
- titanium alloy /
- thin-walled structure /
- vibration fatigue /
- life prediction

HTML

图 1 试验件及测点位置示意图 (单位：mm)

Figure 1. Setup of test piece with measuring points (unit: mm)

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图 2 高温振动疲劳测试系统示意图

Figure 2. Schematic diagram of high temperature vibration fatigue testing system

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图 3 高温振动疲劳试验现场图

Figure 3. Field diagram of high temperature vibration fatigue experiment

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图 4 试验件疲劳裂纹位置

Figure 4. Fatigue crack location of test piece

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图 5 不同温度下应力PSD曲线

Figure 5. Stress PSD curve at different temperatures

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图 6 不同温度下的对数疲劳S_rms-N曲线对比

Figure 6. Comparison of logarithmic fatigue S_rms-N curves at different temperatures

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图 7 不同温度下的疲劳寿命预测曲线对比

Figure 7. Comparison of fatigue life prediction curves at different temperatures

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表 1 各工况下破坏循环次数均值

Table 1. Number of failure cycles under various working conditions

温度/℃	应力方均根值/MPa	平均破坏次数/10⁶
20	49.68	21.10
	61.02	6.90
	84.71	1.82
150	41.12	23.20
	47.62	15.70
	53.23	7.08
300	34.96	29.90
	39.69	17.70
	45.36	7.58

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表 2 各工况下疲劳寿命对比

Table 2. Comparison of fatigue life under different working conditions

温度/℃	应力方均根值/MPa	预测寿命/s	实际寿命/s	误差/%
20	49.68	63273	70244	−9.92
	61.02	27424	24456	12.14
	84.71	6115	6443	−5.09
150	41.12	94316	83005	13.63
	47.62	46309	56059	−17.39
	53.23	26992	25342	6.51
300	34.96	127048	119630	6.20
	39.69	64292	70879	−9.29
	45.36	31396	30258	3.76

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