热解炭涂层Ⅰ-Ⅱ复合型裂纹的应力强度因子分析  

Stress Intensity Factor Analysis of Ⅰ-Ⅱ Composite Crack of Pyrocarbon Coating

作　　者：孙振国 刘刚 张建辉[1] SUN Zhenguo;LIU Gang;ZHANG Jianhui(School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China)

机构地区：[1]杭州电子科技大学机械工程学院,浙江杭州310018

出　　处：《杭州电子科技大学学报（自然科学版）》2020年第6期75-80,共6页Journal of Hangzhou Dianzi University：Natural Sciences

基　　金：浙江省重大科技专项资助项目(2015C01035)。

摘　　要：为了研究人工心瓣热解炭涂层在生产加工等过程中可能出现的微小裂纹,采用ABAQUS有限元分析软件对人工心瓣热解炭涂层裂纹的应力强度因子进行仿真分析。结果表明:在裂纹数量不变的情况下,边缘裂纹和中心裂纹的Ⅰ型应力强度因子随裂纹倾斜角和裂纹长度的增加而增大,当裂纹倾斜角不为0°和90°时,边缘裂纹和中心裂纹的Ⅱ型应力强度因子随裂纹长度的增加而增大;在裂纹倾斜角不变情况下,随着裂纹数量的增加,边缘裂纹和中心裂纹的Ⅰ,Ⅱ型应力强度因子曲线分别重合,且均小于单条裂纹情况下的Ⅰ,Ⅱ型应力强度因子。In order to study the possible micro-cracks in the production and processing of artificial heart valve pyrocarbon coating, the stress intensity factor of artificial heart valve pyrocarbon coating crack was simulated and analyzed by ABAQUS finite element analysis software. The results show that when the number of cracks is constant, the mode Ⅰ stress intensity factor of edge crack and center crack increases with the increase of crack inclination angle and crack length;when the crack inclination angle is not 0 °and 90 °, the mode Ⅱ stress intensity factor of edge crack and center crack increases with the increase of crack length;when the inclination angle of the crack is constant, with the increase of the number of cracks, the mode Ⅰ and Ⅱ stress intensity factor curves of the edge crack and the center crack coincide respectively, and both of them are less than the mode Ⅰ and Ⅱ stress intensity factors in the case of a single crack.

关 键 词：人工心瓣 热解炭 Ⅰ-Ⅱ复合型裂纹 应力强度因子 

分 类 号：TQ127.1[化学工程—无机化工]