低周非比例载荷下钛合金BT9的疲劳特性  

FATIGUE CHARACTERISTICS OF BT9 TITANIUM ALLOY UNDER NON-PROPORTIONAL LOW-CYCLE LOADING

作　　者：佟立丰[1] 

机构地区：[1]九江职业技术学院机械工程学院,九江332007

出　　处：《机械强度》2013年第1期73-76,共4页Journal of Mechanical Strength

摘　　要：在室温下采用钛合金BT9薄壁圆筒试件进行拉—扭复合比例、非比例循环应变低周疲劳试验,并对非比例载荷下的试验结果进行分析。结果表明:在相同von Mises等效应变范围下按圆形轨道循环加载的循环强化程度与循环扭转或循环拉伸下相同。在非比例载荷下钛合金BT9的寿命与比例载荷下的寿命相比有所降低,但没有不锈钢在非比例载荷下寿命降低得明显。Tension-torsion low cycle fatigue tests were carried out using thin-walled tubular specimens of BT9 titanium alloy under proportional and non-proportional cyclic strain paths at room temperature. The results of experimental investigations of the non-proportional low cycle fatigue are proposed and analyzed. The investigations show that the cyclic hardening under the circular cycles and the torsional （or axial） cycles with the same value of yon Misses equivalent strain range is equal in the saturated state. Fatigue lives of BT9 titanium alloy are reduced by non-proportional loading of the specimens compared to proportional loading, but the reduction is not that large as in case of stainless steels.

关 键 词：低周疲劳 附加强化 程序载荷 寿命 

分 类 号：TG146.23[一般工业技术—材料科学与工程] O346.2[金属学及工艺—金属材料]