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A study of craze deformation in the fatigue fracture of polymethylmethacrylate

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Abstract

Continuous measurements of the craze contour have been undertaken for fatigue crack propagation in polymethylmethacrylate. The craze contour was determined by an interference fringe method, using equipment specially constructed for continuous load cycling, mounted on the stage of an optical microscope. It was found that there was a very great variation in the size of the craze for a fixed loading programme, although the crack growth rate showed a good correlation with the applied stress intensity range. A general result is that the craze length in fatigue was found to be greater than that for continuous crack propagation under simple fracture. This result suggested that it would be instructive to examine an extension of the Dugdale line-zone model, where the craze stress is not assumed to be constant along the length of the craze. It is shown that this modified line-zone model can provide some understanding of the observed results for craze deformation in fatigue.

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Author notes

  1. Y. Imai

    Present address: Department of Mechanical Engineering, Nagasaki University, 852, Nagasaki, Japan

Authors and Affiliations

  1. Department of Physics, University of Leeds, Leeds, UK

    Y. Imai & I. M. Ward

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  1. Y. Imai
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  2. I. M. Ward
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Imai, Y., Ward, I.M. A study of craze deformation in the fatigue fracture of polymethylmethacrylate. J Mater Sci 20, 3842–3852 (1985). https://doi.org/10.1007/BF00552372

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  • DOI: https://doi.org/10.1007/BF00552372

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