Boundary element methods for the analysis of crack growth in the presence of residual stress fields |
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| Authors: | V M A Leitao M H Aliabadi D P Rooke R Cook |
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| Affiliation: | (1) Technical University of Lisbon, Lisbon, Portugal;(2) Department of Engineering QMW, University of London, E1 4NS London, UK;(3) Defence Research Agency, Farnborough, UK |
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| Abstract: | Two boundary element methods of simulating crack growth in the presence of residual stress fields are presented, and the results
are compared to experimental measurements. The first method utilizes linear elastic fracture mechanics (LEFM) and superimposes
the solutions due to the applied load and the residual stress field. In this method, the residual stress fields are obtained
from an elastoplastic BEM analysis, and numerical weight functions are used to obtain the stress intensity factors due to
the fatigue loading. The second method presented is an elastoplastic fracture mechanics (EPFM) approach for crack growth simulation.
A nonlinear J-integral is used in the fatigue life calculations. The methods are shown to agree well with experimental measurements
of crack growth in prestressed open hole specimens. Results are also presented for the case where the prestress is applied
to specimens that have been precracked. |
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| Keywords: | BEM cold expansion fracture mechanics nonlinear analysis |
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