Abstract
The determination of stress intensity factors in pre-cracked specimens using mechanical relationships necessitates the measurement of two of the following parameters: load, crack length and crack opening displacement. This study indicates the feasibility of assessing stress intensity factors for a range of aluminium alloys (yield stresses, 300–500 MN m −2) without knowledge of the above parameters. The technique employed, the shadow optical method of caustics, utilizes information from the stress-strain field within a small area close to the crack tip and involves the characterization of the local surface geometry.
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