Measurement of initiation values of GIC in IM6/PEEK composites

P. Davies; W. Cantwell; H. H. Kausch

doi:10.1016/0266-3538(89)90041-9

Measurement of initiation values of G_IC in IM6/PEEK composites

P. Davies, W. Cantwell, H. H. Kausch

Aerospace Engineering

EPFL CDM MTEI RAO

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45 Scopus citations

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.

Original language	British English
Pages (from-to)	301-313
Number of pages	13
Journal	Composites Science and Technology
Volume	35
Issue number	3
DOIs	https://doi.org/10.1016/0266-3538(89)90041-9
State	Published - 1989

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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 GIC 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 GIC, 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 GIC 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.",

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AU - Cantwell, W.

AU - Kausch, H. H.

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N2 - 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 GIC 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 GIC, 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 GIC 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.

AB - 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 GIC 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 GIC, 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 GIC 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.

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Measurement of initiation values of G_IC in IM6/PEEK composites

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