表面粗糙度对TC17疲劳失效影响的试验研究  

Experimental study on the influence of surface roughness on fatigue failure of TC17

作　　者：宋昌平[1] 王金龙 SONG Chang-ping;WANG Jin-long(School of Mechanical Engineering,Dalian Vocational Technical College,Dalian 116037;Marine Engineering College,Dalian Maritime University,Dalian 116026)

机构地区：[1]大连职业技术学院机械工程学院,辽宁大连116037 [2]大连海事大学轮机工程学院,辽宁大连116026

出　　处：《机械设计》2021年第5期104-109,共6页Journal of Machine Design

摘　　要：表面粗糙度是影响金属材料疲劳性能的重要因素,尤其针对钛合金TC17。目前基于表面粗糙度的钛合金TC17疲劳失效研究尚未得到广泛开展,相应的试验数据及结果也较少。以超声疲劳试验技术为基础,针对钛合金TC17进行不同粗糙度条件下的疲劳试验,使用先进的检测设备对试件断口进行观察与检测,分析表面粗糙度对钛合金TC17疲劳失效的影响。结果发现:粗糙度对TC17疲劳失效特征及疲劳性能存在劣化作用,在高周与超高周疲劳范畴中,表面粗糙度都是引起TC17疲劳失效的主要因素。以Murakami模型为基础,结合钛合金TC17疲劳试验结果,验证了经典模型对钛合金TC17疲劳强度预测的适用性,并预测了不同粗糙度条件下TC17的疲劳强度。文中研究内容对钛合金TC17的应用具有积极意义。The surface roughness is an important factor affecting the fatigue properties of metal materials,especially for the titanium alloy TC17. The research on fatigue failure of TC17 based on surface roughness hasn’t been widely carried out,and the related test results are few. In this article,based on the ultrasonic fatigue test,titanium alloy TC17 is subject to fatigue tests with different roughness. The specimen’s fracture is detected with the aid of advanced equipment,and the influence of surface roughness on the titanium alloy TC17’s fatigue failure is explored. The results show that surface roughness is harmful to the titanium alloy TC17’s fatigue failure and fatigue property;surface roughness is the main factor of fatigue failure in both high-cycle fatigue regime and very high-cycle fatigue regime. Based on the Murakami model and in combination with the results of the titanium alloy TC17’s fatigue failure,efforts are made to verify that the classical model is practical to predict the titanium alloy TC17’s fatigue strength,and fatigue strength with different roughness is predicted. The research has positive significance for wide application of the titanium alloy TC17.

关 键 词：钛合金TC17 疲劳强度 表面粗糙度 疲劳试验 

分 类 号：TH122[机械工程—机械设计及理论]