Abstract

The Crack Plane Equilibium (CPE) model is a simple model for predicting the initiation of crack growth in ductile materials. The CPE model is evaluated for center-crack tension specimens and for pipe specimens containing part-through circumferential cracks emanating from the inside surface of the pipe. The model is based upon requiring equilibrium between the applied loads and an assumed stress distribution in the uncracked ligament near the crack tip. Required fracture parameters are the ultimate tensile strength and a process zone size at the crack tip that is determined from simple fracture tests. Crack growth initiation for the crack and specimen geometries studied is predicted with sufficient accuracy to warrant extending the CPE model for investigating other geometries and for predicting stable crack growth and the onset of unstable crack growth.

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