3: Tubes en polyoléfines. STANDARD. ISO. Second edition. Reference number. ISO (E). Provläsningsexemplar / Preview. ISO. Second edition. Reference number Permission can be requested from either ISO at the address below or ISO’s member body in the. EUROPÄISCHE NORM. EN ISO June ICS English Version. Thermoplastics pipes – Determination of tensile properties.
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Material characteristic values determined under standardized processing conditions using standard specimens may differ significantly in some respects from the properties actually existing in a pipe. This is because of the processing state, which is completely different in an extruded pipe as compared to an injection-molded specimen. To characterize this property, specimens are removed from the pipe wall along the length of the pipe. The methodology of specimen removal and testing is described for example in Parts 1 to 3 of ISO Depending on the pipe material and the wall thickness of the pipe, various specimen shapes are used, each of which is intended for a different type of specimen holder.
Specimen strain is determined directly on the specimen using a mechanical or optical long-travel extensometer. Testing welded and joint seams A special form of tensile test is used for welded and 6259- seams.
For this the specimen is removed from the pipe in such a way that the weld or joint seam is located in the free gauge-length area of the specimen. Inhomogeneous strain distribution can be anticipated, making direct extension measurement on the specimen unnecessary in this case. The result obtained is the tensile strength of the joint and, where applicable, a comparison with the tensile strength of the raw material.
BS EN ISO – Thermoplastics pipes. Determination of tensile properties. Polyolefin pipes
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