接触作用对裂尖动态应力强度因子的影响

 颜昌琴,田园,王碧金,吴柯欣,周建良,杨帆

(重庆科技学院 石油与天然气工程学院,重庆 401331)
摘要:为了探究接触作用对于含中心斜裂纹板的动态应力强度因子的影响,采用ANSYS软件分别对平板在两种情况下(考虑与不考虑接触作用)的动态应力强度因子进行了模拟计算,并探究了接触刚度(FKN)对动态应力强度因子( )的影响。由计算结果可以看出:(1)不考虑接触作用的I型动态应力强度因子部分为负值,说明两个裂纹面发生了相互嵌入;(2)考虑了接触作用之后的I型动态应力强度因子可以得到很好的优化,I型动态应力强度因子负值情况基本消失;(3)在考虑接触作用之后应根据实际情况选择合适的接触刚度。
关键词:ANSYS;接触刚度(FKN);动态应力强度因子;裂纹尖端
中图分类号:O242.21 文献标志码:A doi:10.3969/j.issn.1006-0316.2017.06.004
文章编号:1006-0316 (2017) 06-0021-05
Influence of Contact Action on Dynamic Stress Intensity Factor of Crack Tip
YAN Changqin,TIAN Yuan,WANG Bijin,WU Kexin,ZHOU Jianliang,YANG Fan
( College of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China )
Abstract:In order to investigate the influence of contact effect on the stress intensity factor at the crack tip, The dynamic stress intensity factor of slab with central oblique crack was calculated by ANSYS software under two conditions (with and without consideration of contact effect).The effect of contact stiffness (FKN) on the
 dynamic stress intensity factor   is investigated. From the results can be seen: (1)The negative dynamic
 stress intensity factor is not taken into account, indicating that the two crack surfaces are embedded in each other; (2)It is considered that the dynamic stress intensity factor of type I can be well optimized after contact, and the negative value of type I dynamic stress intensity factor disappears; (3)After considering the contact effect should be based on the actual situation to choose the appropriate contact stiffness. It is suggested that the contact element should be considered when calculating the stress intensity factor at the crack tip.
Key words:ANSYS;contact stiffness (FKN);dynamic stress intensity factor;crack tip
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收稿日期:2016-12-28
作者简介:颜昌琴(1990-),女,重庆人,硕士研究生,主要研究方向为缺陷管道的力学行为分析。
 

 

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