摘要
为了揭示钛合金TC17疲劳失效机理,本文针对钛合金TC17疲劳研究建立了适用于钛合金TC17的疲劳寿命预测模型。采用超声疲劳试验技术,对钛合金TC17进行不同应力幅值条件下的疲劳试验,并对试件的表面形貌进行定量检测。应用经典的两参数模型(Basquin模型),结合钛合金TC17疲劳试验结果,提出了超高频率载荷作用下的钛合金TC17应力-寿命(S-N)曲线。使用扫描电镜显微镜对试件断口形貌特征进行观察,分析表面粗糙度对钛合金TC17高周及超高周疲劳失效机理的影响及疲劳性能的劣化作用。结果表明:TC17疲劳强度为615 MPa,表面粗糙度是引起TC17疲劳失效的主要因素。研究内容对钛合金TC17零部件维护及寿命预测具有积极意义。
A suitable fatigue life prediction model is established for titanium alloy TC17 to study its fatigue failure mechanism.Ultrasonic fatigue tests of titanium alloy TC17 with different stress amplitudes are performed,and the surface morphologies of specimens are quantitatively measured by a profilometer,from which the fatigue limit of TC17 is obtained to be 615 MPa.The stress-life(S-N)curve of titanium alloy TC17 under ultra-high frequency loading is proposed using the classical two-parameter model(Basquin model)and the fatigue test results of titanium alloy TC17.The fracture morphologies of specimens are observed using scanning electron microscopy,and the influences of surface roughness on the HCF and VHCF failure mechanisms of titanium alloy TC17 and degradation of fatigue performance are analyzed.The results indicate that surface roughness is the main cause of fatigue failure of titanium alloy TC17.This work has positive significance for the maintenance and life prediction of titanium alloy TC17 parts.
作者
王金龙
高斯博
杨宇星
杜凤鸣
于静
王静思
WANG Jinlong;GAO Sibo;YANG Yuxing;DU Fengming;YU Jing;WANG Jingsi(Marine Engineering College, Dalian Maritime University, Dalian 116023, China;Dalian Scientific Test and Control Technology Institute, Dalian 116013, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2021年第8期1203-1208,共6页
Journal of Harbin Engineering University
基金
国家青年自然科学基金项目(51805067)
博士后自然科学基金项目(2020M670734,2020M680937).
关键词
钛合金TC17
寿命预测
疲劳强度
表面粗糙度
表面失效
疲劳试验
应力强度因子
断口分析
titanium alloy TC17
life prediction
fatigue strength
surface roughness
surface failure
fatigue test
stress intensity factor
fracture analysis
