航空材料学报2017，Vol.37Issue(3)：84-90,7.DOI:10.11868/j.issn.1005-5053.2016.000113
TA11钛合金超高周疲劳行为
Very High Cycle Fatigue Behavior of TA11 Titanium Alloy
摘要
Abstract
The conventional fatigue test method was used to obtain the very high cycle fatigue (VHCF) limits of 3×107 and 1×108 cycles for TA11 titanium alloy in different temperatures and stress ratios.Three parameter power function method was used to obtain the VHCF median S-N curves and equations.The results show that the VHCF strength of 3×107 and 1×108 cycles presented a continue reducing trend compared with the traditional 1 x 107 fatigue limit.This trend is not obvious in negative stress ratio (R=-1),but significant in normal stress ratio (R=0.1 and 0.5),and the reduction amplitude of room temperature tests was greater than that of elevated temperature tests.The fracture morphologies showed that the VHCF cracks initiat at the specimen surface of TA11 alloy in room temperature tests,and the VHCF cracks initiation ways in elevated temperature tests relate to the stress ratio.The cracks initiate at the specimen surface when R=0.1 and 0.5 but in the internal when R=0.5;The surface state of TA11 alloy specimens is the main cause of its fatigue life dispersion.关键词
TA11合金/应力比/S-N曲线/超高周疲劳Key words
TA11 alloy/stress ratio/S-N curves/very high cycle fatigue分类
矿业与冶金引用本文复制引用
焦泽辉,于慧臣,钟斌,李旭东,周静怡..TA11钛合金超高周疲劳行为[J].航空材料学报,2017,37(3):84-90,7.基金项目
航空科学基金(2013ZF21014) （2013ZF21014）
