Christopher, C.J., James, M.N., Patterson, E.A. and Tee, Kong ORCID: 0000-0003-3202-873X (2008) A quantitative evaluation of fatigue crack shielding forces using photoelasticity. Engineering Fracture Mechanics, 75 (14). pp. 4190-4199. ISSN 0013-7944 (doi:https://doi.org/10.1016/j.engfracmech.2008.03.013)

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Abstract

The mechanisms controlling the phenomenon of plasticity-induced shielding during fatigue are investigated and quantified by fitting a recently developed model to photoelastic data. The model derives from the Muskhelishvili approach and includes additional terms to describe the effect of plasticity on the elastic stress field around the crack tip. The photoelastic technique used a polycarbonate CT specimen containing a naturally propagating fatigue crack from which full-field data was obtained digitally using the phase-stepping method. The model was fitted to approximately 1000 data values for the isochromatic fringe order around the crack tip and generated values for the stress intensity factor and T-stress plus an interfacial shear stress intensity factor and a retardation intensity factor which together characterize the influence of plasticity on crack growth.

Item Type:	Article
Additional Information:	[1] First published online: 6 April 2008. [2] Published in print: September 2008. [3] Published as: Engineering Fracture Mechanics, (2008), Vol. 75, (14), pp. 4190–4199.
Uncontrolled Keywords:	fracture mechanics,photoelasticity, crack closure, crack shielding, stress intensity factor, plasticity
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Pre-2014 Departments:	School of Engineering School of Engineering > Department of Civil Engineering
Related URLs:	Publisher Author Organisation
Last Modified:	14 Oct 2016 09:08
URI:	http://gala.gre.ac.uk/id/eprint/3291

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