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J estimation for shallow semi-elliptical surface cracks in wide plates under pure bending

J estimation for shallow semi-elliptical surface cracks in wide plates under pure bending
J estimation for shallow semi-elliptical surface cracks in wide plates under pure bending
Three-dimensional finite element models have been used to predict the J versus applied strain behaviour of shallow semi-elliptical surface cracks in wide steel plates. These models were loaded in pure bending up to fully plastic conditions that produced maximum strains remote from the crack of 10 times the yield strain. This study examined cracks with a crack depth to plate thickness ratio (a/t) in the range 0.05–0.15, and crack depth to crack half-length ratio (a/c) from 0.2 to 0.57, in elastic-hardening materials as well as those with a yield plateau before strain-hardening. The results were found to differ significantly from those obtained from plane strain analyses, and a J estimation scheme was developed from the three-dimensional results. Comparisons between the results obtained in this work and the J predictions provided by existing defect assessment methods show that the proposed equations are a significant improvement when large strains are likely.

j estimation, semi-elliptical cracks, wide plates, elastic–, plastic behaviour, finite element analysis
8756-758X
399-408
Boothman, D.P.
175ce142-5138-437d-8ab9-d04de63284da
Lee, M.
d04961f5-36fc-4d03-af4a-cb3047be7de1
Sumpter, J.G.D.
0649ee1a-191d-4a52-a379-23d86f9d205f
Boothman, D.P.
175ce142-5138-437d-8ab9-d04de63284da
Lee, M.
d04961f5-36fc-4d03-af4a-cb3047be7de1
Sumpter, J.G.D.
0649ee1a-191d-4a52-a379-23d86f9d205f

Boothman, D.P., Lee, M. and Sumpter, J.G.D. (1999) J estimation for shallow semi-elliptical surface cracks in wide plates under pure bending. Fatigue & Fracture of Engineering Materials & Structures, 22 (5), 399-408. (doi:10.1046/j.1460-2695.1999.00170.x).

Record type: Article

Abstract

Three-dimensional finite element models have been used to predict the J versus applied strain behaviour of shallow semi-elliptical surface cracks in wide steel plates. These models were loaded in pure bending up to fully plastic conditions that produced maximum strains remote from the crack of 10 times the yield strain. This study examined cracks with a crack depth to plate thickness ratio (a/t) in the range 0.05–0.15, and crack depth to crack half-length ratio (a/c) from 0.2 to 0.57, in elastic-hardening materials as well as those with a yield plateau before strain-hardening. The results were found to differ significantly from those obtained from plane strain analyses, and a J estimation scheme was developed from the three-dimensional results. Comparisons between the results obtained in this work and the J predictions provided by existing defect assessment methods show that the proposed equations are a significant improvement when large strains are likely.

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More information

Published date: May 1999
Keywords: j estimation, semi-elliptical cracks, wide plates, elastic–, plastic behaviour, finite element analysis

Identifiers

Local EPrints ID: 75392
URI: http://eprints.soton.ac.uk/id/eprint/75392
ISSN: 8756-758X
PURE UUID: 62f62d61-cffc-411e-b7d3-9054e7fa767d

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 17 Jul 2019 00:15

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