A Virtual Crack Closure-Integral Method for Generalized Finite Element with Drilling and Strain Degrees of Freedoms

Journal of Computational Science and Technology

Genki YAGAWA²  Shigeo IRAHA⁴  Hiroshi OKADA¹  Jun TOMIYAMA⁴  Yasuyuki KANDA³ 

[1] Department of Nano Structure and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University;Center for Computational Mechanics Research, Toyo University;Department of Mechanical Systems Engineering, University of the Ryukyus;Department of Civil Engineering and Architecture, University of the Ryukyus

关键词: Fracture Mechanics;    Finite Element Method;    Virtural Crack Closure-Integral Method;    Free Mesh Method;    Genelaized Finite Element;   

DOI  :  10.1299/jcst.3.303

学科分类：地球科学(综合)

来源: Japan Academy

【 摘 要 】

References(17)A virtual crack closure-integral method (VCCM) for the generalized finite element with drilling and strain degrees of freedoms (DOFs) is presented in this paper. Free mesh method (FMM) is one of useful methods for fracture mechanics analysis. However, in FMM, quadratic elements with mid-side nodes cannot be employed due to restrictions arising from its local mesh generation rule around each node. Generalized elements with drilling and strain DOFs which have no mid-side nodes may improve the accuracy in fracture mechanics analysis over the conventional constant strain elements. Present authors have proposed a VCCM for two-dimensional generalized elements with drilling DOFs, in their previous papers. In this paper, in order to improve the accuracy in fracture mechanics analysis further, we present a VCCM for generalized finite element with drilling and strain DOFs. Finally, some numerical examples are presented and it is demonstrated that the generalized element with drilling and strain DOFs has superior accuracy over that with drilling DOFs only.

【 授权许可】

Unknown