SEDL / STP / STP631-EB / STP35543S

Determination of Stress Intensities of Through-Cracks in a Plate Structure Under Uncertain Boundary Conditions by Means of Strain Gages

Kitagawa, H
Professor and graduate student, Tokyo University, Tokyo,

Ishikawa, H
Professor and graduate student, Tokyo University, Tokyo,

Pages: 13    Published: Jan 1977

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Abstract

It is often required to determine the values of the stress-intensity factors at a tip of a given two-dimensional through-crack even when some of the boundary conditions are not exactly given.

A new method is proposed for determination of this kind of stress-intensity factor by combining experimental stress-analysis techniques, fracture mechanics, and variational methods.

In this paper, the stresses on the boundary of a small domain surrounding a crack tip were measured by electric resistance strain gages, and the stress-intensity factors were calculated by variational method. Sufficient accuracy was obtained. For convenience of applications, a method by means of a calculating table was proposed.