Abstract
This paper reviews the results of a frozen stress photoelastic study of the growth and stress intensity factor distributions for surface flaws emanating from the tip of a fin in motor grain models along and off the axis of symmetry of the fin. The cracks were grown under monotomically increasing internal pressure above the critical temperature of the model material. For the non-symmetric cracks, a two-dimensional finite element model was found to closely predict the crack midpoint path (along principal planes of stress). Crack shapes and stress intensity factor (SIF) distributions, together with a simple, predictive model for symmetric cracks are included.
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