Characterisation of plasticity-induced closure--crack flank contact force versus plastic enclave |
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Authors: | MN James MN Pacey L-W Wei |
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Affiliation: | a Department of Mechanical and Marine Engineering, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK b Department of Mechanical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK |
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Abstract: | This paper presents some results from a totally new and powerful fusion between automated, digital photoelastic techniques and mathematical analysis of a crack experiencing closure. In essence, real-time photoelastic stress field data is acquired and fitted to a Muskhelishvili complex potential model of a loaded crack experiencing closure. The fit entails optimisation of multiple variables via a memetic algorithm, which combines a genetic algorithm and a local search. From observations made in this work, it is proposed that the plastic enclave around a crack tip will shield the crack from the full influence of the applied stress field. Furthermore, the effects of this ‘back stress’ are overcome by the applied tensile load in a way that, often, cannot be readily correlated with crack contact length, wake contact force, or with compliance. |
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Keywords: | Plasticity-induced crack closure Photoelasticity Crack flank contact Plastic enclave |
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