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Interlaminar Shear Response of Carbon/Carbon in Torsion Tests

T. Krause, R.S.M. Almeida, E. Volkmann, K. Tushtev, D. Koch, K. Rezwan, K. Rezwan, G. Grathwohl

Journal of Ceramic Science and Technology, Vol. 9, No. 3 (2018), pp. 319-326

DOI: 10.4416/JCST2018-00021

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Abstract

Ceramic matrix composites offer remarkable strength and toughness and are usually designed based on the stacking of fiber plies. These composites are susceptible to debonding of these plies, as their interlaminar strength is significantly lower than in direction of the fibers. In this study, the application of torsion tests for the measurement of the interlaminar shear strength was evaluated using carbon/carbon composites with different porosities. Results obtained with the proposed technique are in accordance with standard methods such as short-beam flexure or double-notched compression. In contrast to these other methods, the torsion test also allows accurate control of superimposed normal stresses on the designated shear plane. The response of the composite samples in loading situations with variable ratios of shear and normal stresses could then be evaluated, leading to failure envelope curves. Different interlaminar fracture mechanisms were discovered depending on the level of normal stress.

Keywords

Carbon fibers, ceramic matrix composites (CMCs), delamination, shear strength.

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