The Interference Effect of Double-Edge Cracks on Limit Moment
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概要
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The interference effect of double-edge cracks of equal length on the plane-strain limit moment is analyzed on the basis of the lower bound theorem. The magnitude of the reduction of the limit moment and crack pitch range, within which the limit moment is reduced by the interference effect, can be predicted by the theory. The crack pitch range influenced by the interference effect is approximately equal to the height of the specimen when the crack length-to-specimen height ratio is less than 2/7, and in the range from 2/7 to unity, it decreases linearly and rapidly with increasing crack length. Theoretical results are compared with the experimental results. Good agreement is obtained between theory and experiment for the magnitude of the reduction of the limit moment and the crack pitch range influenced by the interference effect.
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