Study on the Ultra High Cycle Bending Vibration Fatigue Test of Titanium Alloys
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摘要: 在三点弯曲超高周疲劳试验的基础上,开发了悬臂梁式弯曲振动超高周疲劳试验系统,并介绍了疲劳试验试片的设计方法。利用超高周弯曲疲劳试验系统(20 kHz)测定了钛合金TC17的S-N曲线,结果表明,当应力比R=-1时TC17钛合金的S-N曲线是一条连续下降型曲线,在107周次以后,试样仍未发生疲劳破坏,不存在传统意义上的疲劳极限。Abstract: Based on the three-point bending method,an ultra high cycle bending vibration fatigue system is developed and the design method of fatigue test specimens is introduced too.The S-N curve of titanium alloy TC17 is determined by the ultra high cycle dissymmetrical bending fatigue system(20 kHz).The result shows that when stress ratio(R) is-1,the S-N curve of titanium alloy TC17 is a continuously declining curve,The specimens continue to fail over 107 stress cycles.In 107 weeks time,the samples don't happen the fatigue damage,so it does not exist in the traditional sense fatigue limit.
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Key words:
- titanium alloys /
- TC17 /
- ultra high cycle fatigue /
- bending vibration /
- S-N curve
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