A reappraisal of transition elements in linear elastic fracture mechanics |
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Authors: | Arash Yavari E Thomas Moyer Jr Shahram Sarkani |
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Affiliation: | (1) Graduate Research Assistant, School of Engineering and Applied Science, The George Washington University, Washington, D.C, 20052, U.S.A.;(2) Corporate Scientist, The Engineering Technology Center, Century Building, Suite 1250, 2341 Jefferson Davis Highway, Arlington, Virginia, 22202, U.S.A.;(3) School of Engineering and Applied Science, The George Washington University, Washington, D.C, 20052, U.S.A. |
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Abstract: | This article offers a detailed comparison of the transition elements described by P.P. Lynn and A.R. Ingraffea International Journal for Numerical Methods in Engineering
12,1031–1036] and C. ManuEngineering Fracture Mechanics
24,509–512]. The source of a numerical phenomenon in using Manu's transitionelement (TE) is explained. The effect of eight-noded TEs with differentquarter-point elements (QPE) on the calculated stress intensity factors (SIFs) isinvestigated. Strain at the crack tip is shown to be singular for any ray emanating from the crack tip within an eight-noded TE, but strain has bothr
–1/2andr
–1singularities, withr
–1/2dominating for large TEs. Semi-transition elements (STEs) are defined and shown to have a marginal effect on the calculated SIFs. Nine-nodedtransition elements are formulated whose strain singularity is shown to be the same as that of eight-noded TEs. Then the effect of eight-noded and nine-noded TEs with collapsed triangular QPEs, and rectangular and nonrectangular quadrilateral eight-noded and nine-noded QPEs, is studied, and nine-noded TEs are shown to behave exactly like eight-noded TEs with rectangular eight-noded and nine-noded QPEs and to behave almost the same with other QPEs. The layered transition elements proposed by V. Murti and S.Valliapan Engineering Fracture Mechanics
25, 237–258] areformulated correctly. The effect of layered transition elements is shown by two numerical examples. |
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Keywords: | Transition element crack tip fracture mechanics finite elements |
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