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MODIFIED CRACK CLOSURE INTEGRAL (MCCI) FOR 3‐d PROBLEMS USING 20‐NODED BRICK ELEMENTS
Author(s) -
Narayana K. B.,
George S.,
Dattaguru B.,
Ramamurthy T. S.,
Vijayakumar K.
Publication year - 1994
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1994.tb00797.x
Subject(s) - crack closure , crack tip opening displacement , structural engineering , fracture mechanics , brick , mechanics , finite element method , materials science , displacement (psychology) , closure (psychology) , crack growth resistance curve , strain energy release rate , shear (geology) , tension (geology) , engineering , composite material , compression (physics) , physics , market economy , psychology , economics , psychotherapist
— The Modified Crack Closure Integral (MCCI) technique based on Irwin's crack closure integral concept is very effective for estimation of strain energy release rates G in individual as well as mixed‐mode configurations in linear elastic fracture mechanics problems. In a finite element approach, MCCI can be evaluated in the post‐processing stage in terms of nodal forces and displacements near the crack tip. The MCCI expressions are however, element dependent and require a systematic derivation using stress and displacement distributions in the crack tip elements. Earlier a general procedure was proposed by the present authors for the derivation of MCCI expressions for 3‐dimensional (3‐d) crack problems modelled with 8‐noded brick elements. A concept of sub‐area integration was proposed to estimate strain energy release rates at a large number of points along the crack front. In the present paper a similar procedure is adopted for the derivation of MCCI expressions for 3‐d cracks modelled with 20‐noded brick elements. Numerical results are presented for center crack tension and edge crack shear specimens in thick slabs, showing a comparison between present results and those available in the literature.