TA12钛合金缺口件蠕变疲劳损伤分析1.docx

TA12钛合金缺口件蠕变疲劳损伤分析1.docxTA12钛合金缺口件蠕变疲劳损伤分析1胡绪腾,马晓健,宋迎东(南京航空航天大学能源与动力学院,南京210016)摘要:对TAI2钛合金双边缺口试验件在不同蠕变疲劳载荷条件下的循环应力、应变响应进行了有限元分析,采用时间一循环分数法对不同载荷条件下的蠕变疲劳寿命进行了估算,并对各种情况下的疲劳损伤和蠕变损伤进行了分析。研究结果表明:蠕变损伤和疲劳损伤対TAI2缺II件蠕变疲劳失效的贡献度与循坏载荷大小和保载时间有关。当循环载荷较小、缺口件完全处于弹性状态时,端变损伤对缺口件蠕变疲劳寿命的贡献占绝对比例。随着循环栽荷的增大,保载时间相同时,疲劳损伤的贡献程度逐渐増大,但保持时间增大到一定程度后,蠕变损伤的贡献总是占到较大比例。关键词:TM2钛合金;缺口件;蠕变疲劳;寿命预测;时间一循环分数法中图分类号:,:ACreep-FatigueDamageAnalysisofTA12NotchedSpecimenHUXu-teng,MAXiao-jian,SONGYing-dong(CollegeofEnergyandPowerEngineering,NanjingUniversityofAeronauticsandAstronautics,Nanjing210016)Abstract:Cyclicstress-strainresponseundercreep-,creep-fatiguelifeofnotchedspecimensunderdifferentloadingconditionswaspredictedusingthetime-・Whenthepeakloadislowandthenotchedspecimenisunderelasticstate,thecreepdamagehasaconsiderablecontributiontothecreep-,thefractionoffatiguedamageincreaseswiththeincreasingofthepeakloadvalue・Whentheholdingtimeislongenough,ountedforthemajorproportionofthetotalcreep-:TA12titanium;notchedspecimen;creep-fatigue;lifeprediction;ti