ISSN:
1573-2673
Keywords:
Crack
;
stress intensity factor
;
crack closure
;
spherical shells.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract This article presents an analytical and numerical study of the influence of crack face closure on the stress intensity factor of a crack in a spherical shell subjected to membrane force and bending moment. The formulation developed by Delale and Erdogan based on linearised shallow shell theories is extended to account for crack surface closure in cracked spherical shells, assuming a line contact at the compressive edge of the crack face. It is found that, due to the curvature effects, the closure behaviour of cracks in spherical shell differs significantly from that in flat plates. Depending on the nature of the membrane force and bending moment, crack closure may occur over the entire crack length or only some segments. In the special case of full length crack closure, the coupled integral equations reduce to a single integral equation, leading to a simpler solution. The theoretical results are compared against finite element results of cracked shells compressed between two rigid plates, indicating that the shallow shell theory is valid for a shallowness parameter up to 1/5.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1018682914979
Permalink
