EXPLICIT EXPRESSIONS FOR ENERGY-RELEASE RATES USING VIRTUAL CRACK EXTENSIONS

被引:52
作者
HABER, RB
KOH, HM
机构
[1] Univ of Illinois at, Urbana-Champaign, Dep of Civil, Engineering, Urbana, IL, USA, Univ of Illinois at Urbana-Champaign, Dep of Civil Engineering, Urbana, IL, USA
关键词
ELASTICITY - Stresses - MATERIALS TESTING - Fatigue - MATHEMATICAL TECHNIQUES - Finite Element Method - STRAIN - Computer Aided Analysis;
D O I
10.1002/nme.1620210208
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A new finite element technique for calculating energy release rates is presented. An explicit expression for energy changes due to virtual crack extensions is formulated based on a variation of isoparametric element mappings. Energy release rates are calculated directly from integral expressions evaluated over singular quarter-point isoparametric elements surrounding the crack tip. Since the energy release rates are expressed in variational form, there is no need for the analyst to select a small finite crack extension to simulate a virtual crack extension. The method is shown to produce very accurate solutions even with fairly coarse element meshes. A similar technique for mixed-mode fracture based on mutual potential energy release rates is described.
引用
收藏
页码:301 / 315
页数:15
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