|The Short Beam Shear test (SBS) described in DIN EN 2563 /2377, DIN EN ISO 14130 and ASTM D 2344 for the determination of apparent interlaminar shear strength is a modified 3-Point flexural test. The span length of the fixture is small as compared to the specimen’s thickness which induces shear stress to the specimen. The geometry of the specimen is a short beam of thermoplastics or thermosettings continuously reinforced by fibres in 0° or 0°/90°-direction. The norm defines apparent interlaminar shear strength as “maximum shear stress calculated at half thickness of specimen at the moment of first failure.”
The norm also quotes limits of this method:
On the other hand, the SBS testing method works with only very small and geometrically simple specimen. Using a small amount of material, qualitative information about the resin-fibre relation can be obtained.
: DIN EN 2563, “Aerospace series, Carbon fibre reinforced plastics, Unidirectional laminates, Determination of the apparent interlaminar shear strength”, CEN, 1996