Measurement of initiation values of GIC in IM6/PEEK composites
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Abstract The double cantilever beam (DCB) specimen is widely used to determine delamination resistance under mode I loading. However, recent work has indicated the geometry-dependence of values of G IC measured during propagation of a delamination in unidirectional specimens of IM6/PEEK when fibre bridging and multiple cracking are observed. An alternative approach is to quote initiation values of G IC , but little information is available to allow a rational test procedure to be proposed. In this paper the influence of different types of starter defect on the initiation values of G IC in IM6/PEEK is examined. This has enabled a suitable starter defect type to be identified. Finally, results from static fatigue tests are presented which indicate a self-toughening mechanism in this material.
[1] J. G. Williams,et al. Crack blunting mechanisms in polymers , 1980 .
[2] W. Cantwell,et al. A study of the delamination resistance of IM6/PEEK composites , 1989 .
[3] S. Shaw,et al. A self-toughening mechanism in epoxide resins , 1979 .
[4] Klaus Friedrich,et al. Application of fracture mechanics to composite materials , 1989 .
[5] H. Chai. On the correlation between the mode I failure of adhesive joints and laminated composites , 1986 .