Summary
Crack propagation and the stress intensity at the tip of a crack resulting from impact loading were determined experimentally in narrow bars of polymethyl methacrylate and polycarbonate. Stress wave passage was monitored by strain gages mounted on the specimens. A 24-frame Cranz-Schardin camera recorded crack position and the stress intensity factor at its tip, the latter by means of a shadowgraphic technique known as the method of caustics, developed by Manogg [1] and Theocaris [2]. Static and dynamic stress intensity factors are obtained as functions of the assumed uniform stress at the crack section; the latter is based on the time-shifted strain measurement, the instantaneous intact specimen width and a dynamic Young’s modulus obtained from measured propagation velocity and specimen density.
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Goldsmith, W., Katsamanis, F. (1979). Crack Propagation in Plastics Due to Impact. In: Kawata, K., Shioiri, J. (eds) High Velocity Deformation of Solids. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67208-8_17
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DOI: https://doi.org/10.1007/978-3-642-67208-8_17
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