动载下缝端应力强度因子计算的扩展有限元法

江守燕; 杜成斌

doi:10.3879/j.issn.1000-0887.2013.06.005

动载下缝端应力强度因子计算的扩展有限元法

doi: 10.3879/j.issn.1000-0887.2013.06.005

江守燕^1,2,
杜成斌²

¹河海大学水利水电学院,南京 210098;²河海大学力学与材料学院,南京 210098

基金项目: 国家自然科学基金资助项目（11132003）;中国博士后科学基金资助项目（2013M530233）

详细信息

作者简介:
江守燕（1986—），女，安徽舒城人，博士，博士后(E-mail: syjiang@hhu.edu.cn);杜成斌(1965—)，男，江苏盐城人，教授（通讯作者.E-mail: cbdu@hhu.edu.cn).

中图分类号: TB115;O346.1
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- 文章访问数: 1902
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出版历程
- 收稿日期: 2012-09-11
- 修回日期: 2013-05-16
- 刊出日期: 2013-06-15

Evaluation on Stress Intensity Factors at the Crack Tip Under Dynamic Loads Using Extended Finite Element Methods

JIANG Shou-yan^1,2,
DU Cheng-bin²

¹College of Water Conservancy and Hydropower Engineering,Hohai University, Nanjing 210098, P.R.China;²College of Mechanics and Materials, Hohai University,Nanjing 210098, P.R.China

摘要

摘要: 在扩展有限元法(extended finite element methods, XFEM)的理论框架下，重点研究了动荷载作用下稳定裂纹尖端动态应力强度因子(dynamic stress intensity factors, DSIFs)的求解方法．根据XFEM的位移模式，推导了动力XFEM的支配方程，采用Newmark隐式算法进行时间积分同时，提出一种XFEM质量矩阵的集中策略，给出了求解DSIFs的相互作用积分方法，与静态问题的相互作用积分方法相比，增加了惯性项的贡献．最后，若干典型算例的计算结果表明：XFEM可以准确评价稳定裂纹尖端的DSIFs，建议的质量矩阵集中策略是有效的，为得到正确的DSIFs，惯性项的贡献不可忽略.
- 扩展有限元法 /
- 动载 /
- 裂纹 /
- 动应力强度因子 /
- 相互作用积分
Abstract: In the framework of the extended finite element methods (XFEM), the extraction of dynamic stress intensity factors (DSIFs) for stationary cracks being subjected to dynamic loads was detaily studied. Having constructed the approximation of dynamic XFEM, the derivation of governing equation for dynamic XFEM was presented. The Newmark implicit algorithm was used for time integration. Meanwhile, a mass lumping strategy for XFEM implicit dynamics was proposed. In addition, the interaction integral method was given for evaluating DSIFs. Compared with the interaction integral method for evaluating stress intensity factors (SIFs) of cracks under static conditions, the contribution of inertial effects was added to the interaction integral method for evaluating DSIFs. The numerical illustrations show that the XFEM can evaluate accurately DSIFs and the proposed mass lumping strategy is also quite effective. To obtain DSIFs correctly, the inertial effects on interaction integral cannot be ignored.
- extended finite element methods /
- dynamic loads /
- cracks /
- dynamic stress intensity factors /
- interaction integral

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参考文献(22)

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动载下缝端应力强度因子计算的扩展有限元法

doi: 10.3879/j.issn.1000-0887.2013.06.005

作者简介:
江守燕（1986—），女，安徽舒城人，博士，博士后(E-mail: syjiang@hhu.edu.cn);杜成斌(1965—)，男，江苏盐城人，教授（通讯作者.E-mail: cbdu@hhu.edu.cn).

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Evaluation on Stress Intensity Factors at the Crack Tip Under Dynamic Loads Using Extended Finite Element Methods

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动载下缝端应力强度因子计算的扩展有限元法

doi: 10.3879/j.issn.1000-0887.2013.06.005

作者简介: 江守燕（1986—），女，安徽舒城人，博士，博士后(E-mail: syjiang@hhu.edu.cn);杜成斌(1965—)，男，江苏盐城人，教授（通讯作者.E-mail: cbdu@hhu.edu.cn).

计量

出版历程

Evaluation on Stress Intensity Factors at the Crack Tip Under Dynamic Loads Using Extended Finite Element Methods

计量

出版历程

目录

作者简介:
江守燕（1986—），女，安徽舒城人，博士，博士后(E-mail: syjiang@hhu.edu.cn);杜成斌(1965—)，男，江苏盐城人，教授（通讯作者.E-mail: cbdu@hhu.edu.cn).