Fast and effective micromechanical testing of the interfacial shear strength is the focus of the novel DIN SPEC 19289. Published in August 2022, this pre-standard or ‘technical rule’ specifies how to characterize the bonding between fibre and matrix by means of a single-fibre pull-out test.

The technique is well suited for the needs of the composite industry and the specification was developed in the scope of a publicly funded research project between the partners Fraunhofer IGCV, Faserinstitut Bremen e.V. (FIBRE) and Textechno. The method described in DIN SPEC 19289 is implemented in Textechno’s FIMATEST system.

Up to now a characterization of the interfacial shear strength according to standards was only possible with elaborate and hence expensive macromechanical testing techniques such as interlaminary shear strength testing (ILSS). Whereas the results of macromechancial tests tend to depend on the exact mechanical structure of the test specimen, the single-fibre pull-out test gives a direct measure of the fibre-matrix adhesion strength on its own.

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