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The performance of isoparametric finite elements in stress intensity factor determination
Analysis of compact compression specimen used for fracture toughness evaluation of cementitious materials is carried out by the finite element method using isoparametric elements. Both trangular and rectangular elements were used with those surrounding the crack tip being of the quater point type. Solutions were obtained for different mesh subdivisions and convergence curves for the stress intensity factor were obtained by several methods based on extrapolation and energy techniques. It is found that monotonic convergence was obtained for all cases considered. Employing uniformly graded rectangular element representations converged solutions for the stress intensity factor (assuming 1 percent convergence criterion) were obtained by the energy methods using a total of 720 degrees of freedom for solving half the structure. Tests on modified 100 mm cubes with symmetrical notches were conducted to determine the fracture toughness. The fracture toughness was calculated from the stress intensity factor and the maximum load obtained from the tests which were conducted in a stiff Instron testing machine. The fracture toughness is found to be independent of the size of the notch.
The performance of isoparametric finite elements in stress intensity factor determination
Analysis of compact compression specimen used for fracture toughness evaluation of cementitious materials is carried out by the finite element method using isoparametric elements. Both trangular and rectangular elements were used with those surrounding the crack tip being of the quater point type. Solutions were obtained for different mesh subdivisions and convergence curves for the stress intensity factor were obtained by several methods based on extrapolation and energy techniques. It is found that monotonic convergence was obtained for all cases considered. Employing uniformly graded rectangular element representations converged solutions for the stress intensity factor (assuming 1 percent convergence criterion) were obtained by the energy methods using a total of 720 degrees of freedom for solving half the structure. Tests on modified 100 mm cubes with symmetrical notches were conducted to determine the fracture toughness. The fracture toughness was calculated from the stress intensity factor and the maximum load obtained from the tests which were conducted in a stiff Instron testing machine. The fracture toughness is found to be independent of the size of the notch.
The performance of isoparametric finite elements in stress intensity factor determination
Die Leistungsfähigkeit isoparametrischer finiter Elemente bei der Bestimmung von Spannungsintensitätsfaktoren
Sabir, B.B. (author)
International Journal of Fracture ; 72 ; 259-275
1995
17 Seiten, 13 Bilder, 2 Tabellen, 16 Quellen
Article (Journal)
English
The performance of isoparametric finite elements in stress intensity factor determination
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