| 20kHz下TC17钛合金超高周疲劳性能研究 |
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| 引用本文： | 高潮,程礼,彭桦,申景生,邱辰霖,刘延杰.20kHz下TC17钛合金超高周疲劳性能研究[J].航空动力学报,2012,27(4):811-816. |
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| 作者姓名： | 高潮 程礼 彭桦 申景生 邱辰霖 刘延杰 |
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| 作者单位： | 1. 空军工程大学工程学院,西安,710038
2. 重庆大学通信工程学院,重庆,400044 |
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| 基金项目： | 国家自然科学基金(50975284); 维修预研基金(5132701) |
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| 摘 要： | 应用基于压电超声疲劳试验技术开发的20kHz弯曲疲劳试验系统,完成了室温下TC17合金超高周疲劳试验.结果表明:在疲劳循环大于107周次时,试样仍会发生疲劳断裂,疲劳强度随循环次数的增加而下降,并不存在明显的疲劳极限.TC17合金的应力-寿命(S-N)曲线在107~109周次的范围内为连续下降型.光学显微镜发现,TC17合金的疲劳破坏主要起源于试样表面.当存在夹杂物时,疲劳裂纹从距离表面很近的夹杂物处萌生,能谱分析表明夹杂物的成分主要是铝的氧化物.
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| 关 键 词： | 弯曲疲劳 超高周疲劳 应力-寿命 (S-N) 曲线 TC17合金 疲劳强度 |
| 收稿时间： | 2011/5/22 0:00:00 |
| 修稿时间： | 2012/2/12 0:00:00 |
Investigation of ultra-high cycle fatigue behavior of TC17 alloy at a frequency of 20kHz |
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| GAO Chao,CHENG Li,PENG Hu,SHEN Jing-sheng,QIU Chen-lin and LIU Yan-jie.Investigation of ultra-high cycle fatigue behavior of TC17 alloy at a frequency of 20kHz[J].Journal of Aerospace Power,2012,27(4):811-816. |
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| Authors: | GAO Chao CHENG Li PENG Hu SHEN Jing-sheng QIU Chen-lin and LIU Yan-jie |
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| Institution: | 1 (1.The Engineering Institute,Air Force Engineering University,Xi’an 710038,China; 2.School of Communication Engineering, Chong Qing University,Chongqing 400044,China) |
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| Abstract: | The bending fatigue system was developed using the piezoelectric ultrasonic fatigue testing technology and experimental investigation of the ultra-high cycles fatigue life for TC17 alloy subjected to bending fatigue deformation has been conducted.The experimental resultes show that the specimens were tested to failure in the range of 107-109 cycles and the fatigue limit decreases with the increasing number of cycles between 107 and 109 for R=-1.0 and there was no obvious fatigue limit.The S-N curve for TC17 is a continuous decline curve between 107 and 109 cycles.The fractographic study showes that fatigue failures are mostly initiated at the surface of the test specimens.When there are subsurface inclusions,fatigue cracks initiated from subsurface inclusions,and the composition of inclusions is mainly oxides of aluminums. |
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| Keywords: | bending fatigue ultra-high cycles fatigue S-N(stress-number of cycles to failure) curve TC17 alloy fatigue strength |
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