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Effects of biaxial loading on crack driving force and constraints in shallow semi-elliptical surface flaws

Effects of biaxial loading on crack driving force and constraints in shallow semi-elliptical surface flaws
Effects of biaxial loading on crack driving force and constraints in shallow semi-elliptical surface flaws
Three-dimensional, elastic-plastic finite element analyses have been carried out to investigate the effects of biaxial loading on J-integrals and Q-values for shallow semi-elliptical surface flaws in wide plates. Direct tension and pure bending loading of up to about 10 times the yield strain were applied to models with linear elastic-power hardening and tripartite material behaviours. Crack depths were limited to 15 percent of the plate thickness. Differences were observed between the effects of biaxiality on J-strain behaviour for cracks in semi-infinite plates and those in finite width plates. The cracked semi-infinite geometry was considered more representative of structural applications. In this case, biaxial loading gave a large increase in J-integrals compared to uniaxial loading, but had negligible effect on constraint, as measured using the Q-value.
biaxial loading, uniaxial loading, cracked geometry, plasticity
0376-9429
37-54
Lee, M.M.K.
b0eec6ec-1557-494d-bbc5-4cd053cfbe46
Boothman, D.P.
175ce142-5138-437d-8ab9-d04de63284da
Luxmoore, A.R.
307e05c5-bacc-4f32-9ea7-4363f2e526e8
Lee, M.M.K.
b0eec6ec-1557-494d-bbc5-4cd053cfbe46
Boothman, D.P.
175ce142-5138-437d-8ab9-d04de63284da
Luxmoore, A.R.
307e05c5-bacc-4f32-9ea7-4363f2e526e8

Lee, M.M.K., Boothman, D.P. and Luxmoore, A.R. (1999) Effects of biaxial loading on crack driving force and constraints in shallow semi-elliptical surface flaws. International Journal of Fracture, 98 (1), 37-54. (doi:10.1023/A:1018731604580).

Record type: Article

Abstract

Three-dimensional, elastic-plastic finite element analyses have been carried out to investigate the effects of biaxial loading on J-integrals and Q-values for shallow semi-elliptical surface flaws in wide plates. Direct tension and pure bending loading of up to about 10 times the yield strain were applied to models with linear elastic-power hardening and tripartite material behaviours. Crack depths were limited to 15 percent of the plate thickness. Differences were observed between the effects of biaxiality on J-strain behaviour for cracks in semi-infinite plates and those in finite width plates. The cracked semi-infinite geometry was considered more representative of structural applications. In this case, biaxial loading gave a large increase in J-integrals compared to uniaxial loading, but had negligible effect on constraint, as measured using the Q-value.

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More information

Published date: May 1999
Keywords: biaxial loading, uniaxial loading, cracked geometry, plasticity

Identifiers

Local EPrints ID: 75380
URI: http://eprints.soton.ac.uk/id/eprint/75380
ISSN: 0376-9429
PURE UUID: 351c241b-1771-4465-85c6-b40f2635a4fa

Catalogue record

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

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