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Effect of absorbed water, temperature and strain rate on the yield strength of two methylmethacrylate-based plastics

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Abstract

The yielding behaviour in compression has been determined for two poly (methylmethacrylate) (PMMA)-based materials when dry or saturated with water. Measurements were made over the temperature range 0 to 60°C and at test speeds varying by 1000-fold. Wet material, as expected, shows a lower yield strength but this cannot be predicted from the strength of dry material and the change in the glass transition temperature. Yield strengths of wet material may be just as accurately calculated from that of dry material by subtracting 10 MPa for each per cent of water absorbed. A data analysis method for superimposing yield strength values at various strain rates to different temperatures is given which does not rely on a mechanical shifting of curves.

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  1. Materials Division, Materials Research Laboratory, Defence Science and Technology Organisation, Maribyrnong, Victoria, Australia

    P. J. Burchill

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  1. P. J. Burchill
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Burchill, P.J. Effect of absorbed water, temperature and strain rate on the yield strength of two methylmethacrylate-based plastics. J Mater Sci 24, 1936–1940 (1989). https://doi.org/10.1007/BF02385402

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  • DOI: https://doi.org/10.1007/BF02385402

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