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Abstract
For a two-dimensional body with a crack, J integral is described as a function of stress intensity factor, while M integral is expressed in terms of stress intensity factor and crack length. By combining these characteristics with the path-independence of these two integrals, a method was proposed of evaluating crack length and stress intensity factor simultaneously from strain-gage measurements along a given integral path. Engineering applicability of the proposed method was examined by experiments and FEM simulation analysis with a center-cracked panel and a double-edge-cracked panel. Good accuracy was obtained for the stress intensity factor determined form J integral, irrespective of crack length. The crack length evaluation was also satisfactory for long cracks, but relatively poor for short cracks; this resulted form the accuracy of M integral evaluation. Gauss quadrature was found useful for reducing number of measuring points of strain without sacrificing the accuracies of the two quantities.
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