| BS EN ISO: 14126 | Part: 0 | Published: 1999 | Contact: BSI |
| Title | Fibre-reinforced plastic composites - Determination of compressive properties in the in-plane direction |
| Scope | This international standard specifies two methods for determining compressive properties, in directions parallel to the plane of lamination, of fibre-reinforced plastic composites. |
| Comment | A framework has been developed in order to rationalise the many test methods and even greater number of loading fixtures/jigs. The approach taken is to concentrate on the quality of the test by requiring the specimen to be strain gauged on both faces and for the test to be completed, or terminated, within a bending (buckling) strain of less than 10% of the axial strain. This limit also applies in the equivalent ASTM standard, D 3410.Concentrating on the quality of the test allows for a range of jigs to be used, for the continuing development of jigs and ensures that established tests are used correctly. Both shear face loaded and end loaded jigs, as in ISO 8515, are allowed. The jig used must be quoted, either an established jig from those listed in the annex or any other that is used. The revision of ASTM D 3410 enabled greater harmonisation with the CEN/ISO standard (i.e. 10 mm widths and gauge lengths rather than 12.5 mm (~ 0.5 inch) when moving to metric dimensions. A disposition was requested by the USA, so that providing the first five specimens fail correctly within the 10% bending strain criteria, further specimens of the same batch, using the same operator, equipment etc., can be tested without, or with a single, strain gauge(s). A second specimen size, 25 mm wide by 25 mm gauge length isincluded for fabrics, mats and multidirectional lay-ups but uses a 4 mm or greater thickness based on ASTM D3410 guidelines to avoid premature failure by Euler buckling.A recent new ASTM 6641 standard replicates the end loaded Method B in the BS EN ISO 14126. |
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