无加强U型钛波纹管疲劳寿命研究  

Research on Fatigue Life of Unreinforced U-shaped Titanium Bellows Expansion Joints

作　　者：秦建 裴崟寅 张爱琴 李杰 吕晓春 QIN Jian;PEI Yin- yin;ZHANG Ai- qin;LI Jie;LYU Xiao- chun(State Key Laboratory of Advanced Brazing Filler Metals ＆ Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450001,China;Luoyang Ship Material Research Insti- tute,Luoyang 471000,China;Harbin Welding Institute Limited Company,Harbin 150000,China)

机构地区：[1]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,河南郑州450001 [2]中国船舶重工集团公司第七二五研究所,河南洛阳471000 [3]哈尔滨焊接研究院有限公司,黑龙江哈尔滨150000

出　　处：《压力容器》2018年第6期8-14,共7页Pressure Vessel Technology

基　　金：国家重点研发计划项目(2017YFB0305701)

摘　　要：针对无加强U型钛波纹管,依据ASME B31.3附录X302.1.3中新材料波纹管的疲劳寿命设计公式规定,对其疲劳寿命设计公式进行了相应的推导,并对其疲劳断裂形式进行了分析。经与奥氏体不锈钢无加强U型波纹管的疲劳寿命公式对比发现,相比奥氏体不锈钢,钛制波纹管的疲劳寿命较低,计算求得的钛制波纹管疲劳寿命设计公式安全系数较大,采用此公式进行钛制波纹管设计偏于安全;钛制波纹管的疲劳断裂形式与传统的奥氏体不锈钢波纹管断裂形式相同,其裂纹起于两端再向中间扩展,断口形式为典型的韧性断裂。In view of the unreinforced U-shaped titanium bellows, corresponding deduction was conducted for the design formula of the fatigue life according to the provisions of fatigue life design formula of new material bellows in Annex X302. 1.3 to ASME B31.3, and its fatigue fracture mode was analyzed by SEM. By comparison with the fatigue life formula of the austenitic stainless steel unreinforced U-shaped titanium bellows, it was found that the fatigue life of titanium bellows was lower. The safety factor in the design formula of fatigue life of the titanium bellows was relatively big, therefore, it is safe to adopt this formula for design of titanium bellows;the fracture mode of titanium bellows was the same as that of the conventional austenitic stainless steel bellows, the crack was initiated at its both ends and extended to the middle part, and its fracture mode was the typical ductile fracture.

关 键 词：TA2纯钛 波纹管膨胀节 疲劳寿命 断裂 

分 类 号：TH142.3[一般工业技术—材料科学与工程] TQ051[机械工程—机械制造及自动化]