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20KHz下TC4钛合金超高周疲劳性能研究
Investigation of ultra-high cycle fatigue behavior of TC4 alloy at a frequency of 20KHz
投稿时间: 2016-10-29  最后修改时间: 2017-01-20
DOI:
中文关键词:  TC4钛合金  超高周疲劳  拉压振动  次表面裂纹源  裂纹扩展
英文关键词:titanium alloys TC4  ultra-high cycle fatigue  stretching vibration  subsurface crack initiation  crack propagation
基金项目:国家自然科学基金青年人才项目(11402302);陕西省自然科学基金(2016JQ1031);
作者单位E-mail
陈皎 空军工程大学航空航天工程学院 1052863080@qq.com 
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中文摘要:
      应用基于压电超声疲劳试验技术开发的20KHz超声疲劳拉压试验系统,完成了室温下TC4钛合金超高周拉伸疲劳试验,分析了次表面断裂的试件断口。结果表明:在疲劳循环大于107周次时,试件仍会发生疲劳断裂,且疲劳强度会随循环次数的增加而下降,不存在明显的疲劳极限;TC4钛合金断口呈现 “类鱼眼”形貌,能谱分析未观察到裂纹源处夹杂物的存在;超高周疲劳试验时,试件疲劳裂纹的萌生寿命决定了试件的疲劳寿命。
英文摘要:
      The stretching vibration system was developed using the piezoelectric ultrasonic fatigue testing technology and experimental investigation of the ultra-high cycles fatigue life for TC4 alloy subjected to stretching fatigue deformation has been conducted at room temperature. Fatigue crack initiation arising on fracture subsurface was analyzed. The results show that the specimens were tested still to failure beyond 107 cycles and the fatigue strength decreases with the increase of cycle times. There is no obvious fatigue limit. The fractographic study shows that fracture is fish-eye like. There are no inclusions in the fatigue crack initiation. Fatigue life of specimen is decided by its crack initiation life.
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