SEDL / STP / STP905-EB / STP17421S

Comparison of Predicted Versus Experimental Stress for Initiation of Crack Growth in Specimens Containing Surface Cracks

Reuter, WG
Principal Engineer, EG&G Idaho, Inc., Idaho Falls, ID

Pages: 17    Published: Jan 1986

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Abstract

Fracture mechanics concepts were used to evaluate the ability to predict the stress for crack initiation for specimens containing surface cracks. The comparison is made between the predicted stress (σ^pred) and the experimentally determined stress (σ^exp). The predictions were made for conditions ranging from elastic to plastic. The predictions were based on suggestions by P. Paris for modifying an equation developed for center-cracked panels. Acoustic emission techniques were used to detect the load corresponding to crack initiation.