BS EN ISO 179-1-2010 pdf download

BS EN ISO 179-1-2010 pdf download.Plastics – Determination of Charpy impact properties Part 1: Non-instrumented impact test (ISO 179-1:2010). 6.3.1.1.2 The preferred type of notch is type A (see Table 2 and Figure 5). For most materials, unnotched specimens or specimens with a single type A notch tested by edgewise impact (see 3.3) are suitable. If specimens with a type A notch do not break during the test, specimens with a type C notch shall be used. If information on the notch sensitivity of the material is desired, specimens with notch types A, B and C shall be tested. 6.3.1.1.3 Unnotched or double-notched specimens tested by flatwise impact (see 3.4) can be used to study surface effects (see 1.3 and Annex A). 6.3.1.2 Sheet materials The recommended value of the thickness, h, is 4 mm. If the specimen is cut from a sheet or a piece taken from a structure, the thickness of the specimen, up to 10.2 mm, shall be the same as the thickness of the sheet or the structure. Specimens taken from pieces thicker than 10,2 mm shall be machined to (10 ± 0,2) mm from one surface, provided that the sheet is homogeneous in its thickness and contains only one type of reinforcement uniformly distributed. If unnotched or double-notched specimens are tested by flatwise impact, the original surface shall be tested under tension. 6.3.2 Materials exhibiting Interlaminar shear fracture (e.g. long-fibre-reinforced materials) 6.3.2.1 Unnotched specimens of type 2 or 3 are used. Apart from the thickness, the specimen dimensions are not specified. The most important parameter is the ratio of the span between the specimen supports to the specimen dimension in the direction of the blow (see Table 1). Usually specimens are tested in the normal direction (see Figure 4). 6.3.2.2 “Flatwise normal testing (see Figure 4): the width of specimen shall be 10 mm for materials reinforced with a fine structure (thin fabrics and parallel yams) and 15 mm for materials reinforced with a large stitch structure (roving fabrics) or an irregularly manufactured structure. 6.3.2.3 “Edgewise parallel” testing (see Figure 4): when testing specimens in the parallel direction, the specimen dimension perpendicular to the blow direction shall be the thickness of the sheet from which the specimen was cut. 6.3.2.4 The length, I, of the specimen shall be chosen to give a span-to-thickness ratio, LIh, of 20 for type 2 specimens and 6 for type...