EN ISO 14126:1999

1.1 This International Standard specifies two methods for determining compressive properties, in directions parallelto the plane of lamination, of fibre-reinforced plastic composites.1.2 The compressive properties are of interest for specifications and quality-control purposes.1.3 Two loading methods and two types of specimen are described. They are: Method 1: provides shear loading of the specimen (gauge length unsupported). Method 2: provides end loading, or mixed loading, of the specimen (gauge length unsupported).NOTE For tabbed specimens end-loaded using method 2, some load is transferred into the specimen gauge length byshear through the tabs. Type A specimen: rectangular cross-section, fixed thickness, end-tabbed. Type B specimen: rectangular cross-section, range of thicknesses, untabbed or end-tabbed (two sizesavailable).Any combination of test method and specimen may be used, provided that the requirements of subclause 9.8 aresatisfied and that the specimen is representative of the material under test. These alternative test conditions will notnecessarily give the same result.The type A specimen is the preferred specimen for unidirectionally reinforced materials tested in the fibre direction.For other materials, the type A or B specimen may be used. The type B2 specimen is preferred for mat, fabric andother multidirectionally reinforced materials.1.4 The methods are suitable for fibre-reinforced thermoplastic and thermosetting plastic composites.Unreinforced and particle-filled plastics, as well as those reinforced with short fibres (less than 1 mm in length), arecovered by ISO 604 (see bibliography).1.5 The methods are performed using specimens which may be machined from a test panel made in accordancewith ISO 1268 or equivalent methods, or from finished or semi-finished products.1.6 The methods specify required dimensions for the specimen. Tests which are carried out on specimens of otherdimensions, or on specimens which are prepared under different conditions, may produce results which are notcomparable. Other factors, such as the speed of testing, the support fixture used and the condition of thespecimens, can influence the results. Consequently, when comparative data are required, these factors must becarefully controlled and recorded.1.7 Fibre-reinforced plastics are usually anisotropic. It is therefore often useful to cut test specimens in at least thetwo main directions of anisotropy, or in directions previously specified (for example a lengthwise directionassociated with the production process).