scholarly journals Numerical determination of stress intensity factors: J-integral and modified virtual crack closure technique

2020 ◽  
Vol 28 ◽  
pp. 146-154
Author(s):  
Carlos D.S. Souto ◽  
Sérgio M.O. Tavares ◽  
José A.F.O. Correia ◽  
Abílio M.P. De Jesus
Keyword(s):  
Stress Intensity ◽  
Crack Closure ◽  
Stress Intensity Factors ◽  
J Integral ◽  
Numerical Determination ◽  
Virtual Crack Closure Technique ◽  
Intensity Factors ◽  
Closure Technique

Quarter-Point Elements Are Unnecessary for the VCCT

2020 ◽  
Vol 87 (8) ◽  
Author(s):  
Elad Farkash ◽  
Leslie Banks-Sills
Keyword(s):  
Stress Intensity ◽  
Energy Release ◽  
Crack Closure ◽  
Stress Intensity Factors ◽  
Virtual Crack Closure Technique ◽  
Intensity Factors ◽  
Release Rates ◽  
Closure Technique ◽  
Established Method ◽  
Energy Release Rates

Abstract The virtual crack closure technique (VCCT) is a well-established method for determining energy release rates and stress intensity factors in homogeneous, isotropic materials. It has been implemented with four-noded, eight-noded, quarter-point, and other higher order elements. It is most convenient and accurate when used with eight-noded, isoparametric elements. VCCT produces less accurate results when used with quarter-point elements. Yet, this method continues to be employed with quarter-point elements. It is strongly recommended to use VCCT with regular eight-noded elements. Three examples will be presented to illustrate the inaccuracy when using quarter-point elements with VCCT.

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