Abstract
The interlaminar shear strength was estimated for four types of B-A1 unidirectional composites. The shear strengths from the short beam shear test and symmetric block shear test sometimes show a considerable differ ence. It is shown that in the case of a matrix of high plasticity and (or) many defects in the shear-plane the short beam shear test gives a much too high shear strength. The symmetric block shear test supplies more realistic values both for the inter- and intralaminar shear strength.

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