Interlaminar Shear Strength Fixture, ILSS

ILSS tests are a typical procedure for monitoring quality and are suitable for the comparison of materials. 

The procedure supplies only apparent shear properties, as peak stresses occur near to the loading fin. 

ILSS tests can be performed by using a sufficiently rigid 3-point bending fixture. The span-to-thickness ratio of 10 mm is very short. This causes high shearing forces and relatively low bending moments in the specimen.