Abstract
Direct measurement of the complex stress conditions at the tip of a crack are difficult if possible to achieve. A useful indirect technique is the shadow optical method of caustics which obtains a measurement of crack tip conditions from the depressions formed on the surface of the material at the free ends of the crack front. This caustics technique has been conveniently simulated by a model that can be hosted on a Personal Computer (PC) of a type frequently used in laboratories to capture and process experimental data. Both caustics experimental results and data from the PC model are compared with theoretical predictions of crack tip stress conditions. This study is pan of an investigation into the possible wider use of the caustics technique to research crack tip conditions in joints and other situations where direct measurements are not feasible.
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