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Experimental and computational assessment of the T* fracture parameter during creep relaxation

MacKenzie, P.M. and Walker, C.A. (2003) Experimental and computational assessment of the T* fracture parameter during creep relaxation. In: Handbook of Moiré Measurement (Series in Optics and Optoelectronics). Taylor and Francis, pp. 103-109. ISBN 0750305223

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Abstract

While most fracture mechanics investigations are concerned with crack growth, there is a class of behaviour that occurs during creep relaxation where the plastic zone develops in a regime of reducing stress and near-zero crack growth. This behaviour has been measured in the aluminium alloy 7075 T6, using moiré interferometry at 190°C, and the experimental data have been used to investigate the T* integral fracture parameter as a function of time and creep deformation. It was found that under time-dependant deformation conditions T* could be measured successfully. For a fuller investigation of T* as a function of the deformation a finite element model of the specimen was calibrated using experimental data.