| BS EN ISO: 14130 | Part: 0 | Published: 1998 | Contact: BSI |
| Title | Fibre reinforced plastic composites - Determination of apparent interlaminar shear strength by short beam method |
| Scope | This international standard specifies a procedure for determining the apparent interlaminar shear strength of fibre-reinforced plastic composites by the short-beam method. The method is suitable for use with fibre-reinforced plastic composites with a thermoset or a thermoplastic matrix, providing interlaminar shear strength is obtained. When using other than laminated materials which are not symmetrical and balanced, the results may be affected by various couplings such as extension/bending, bending/twisting etc. |
| Comment | The test is similar in nature to the three-point loading method used to determine the flexural properties of plastics (see also ISO 14125 - Fibre-reinforced plastic composites - Determination of flexural properties). However, a smaller test span/specimen thickness ratio is adopted to increase the level of shear stress relative to the flexural stress in the test specimen to encourage interlaminar shear failure. It is emphasised that the result obtained is not an absolute value. For this reason the term 'apparent interlaminar shear strength' is used to define the quantity measured.Test results from different-sized specimens, or from specimens tested under different conditions, are not directly comparable. The method is most likely, but not definitely to produce interlaminar failures for unidirectional material. For many materials failure can occur in compression or tension. These failure modes are highlighted in the standard (I.e. classified as acceptable and unacceptable). The test method is normally used for quality control as a measure of fibre/matrix or ply/ply adhesion, and not for generating design data. Further information is given under ""Introduction to composites testing"". |
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