ISO 8521:2020 玻璃纤维增强热固性塑料（GRP）管材 表观初始圆周拉伸强度的测定试验方法

标准编号：ISO 8521:2020

中文名称：玻璃纤维增强热固性塑料（GRP）管材 表观初始圆周拉伸强度的测定试验方法

英文名称：Glass-reinforced thermosetting plastic (GRP) pipes — Test methods for the determination of the initial circumferential tensile wall strength

发布日期：2020-07

标准范围

本文件规定了六种试验方法，用于测定玻璃纤维增强热固性塑料（GRP）管道每单位长度的初始周向拉伸壁强度。注:“周向抗拉强度”的另一个常用术语是“环向抗拉强度”，这两个表达式可以互换使用。爆破试验（方法A）适用于所有类型和尺寸的管道。它被认为是参考方法。然而，本文件中的所有方法具有同等效力。如果可以通过比较试验程序确定任何方法B与F的相关性，则该方法可被视为参考方法。裂盘试验（方法B）并不总是适用于具有螺旋缠绕加强层的管道。剥离试验（方法C）、改良剥离试验（方法D）和约束剥离试验（方法E）适用于公称尺寸大于等于DN 500的管道。缺口板试验（方法F）主要用于标称尺寸大于DN 500的螺旋缠绕管道，缠绕角度约为90°。一种方法得出的结果不一定等于任何替代方法得出的结果。如果需要，可通过方法A确定初始周向拉伸模量。

This document specifies six test methods for the determination of the initial circumferential tensile wall strength per unit of length of glass-reinforced thermosetting plastics (GRP) pipes.NOTE Another commonly used term for "circumferential tensile strength" is "hoop tensile strength" and the two expressions can be used interchangeably.The burst test (method A) is suitable for all types and sizes of pipes. It is considered the reference method. However, all the methods in this document have equal validity. If correlation of any of the methods B to F can be established by a comparative test programme, then that method can be considered as the reference method.The split disc test (method B) is not always suitable for pipes with helically wound reinforcing layers.The strip test (method C), the modified strip test (method D) and the restrained strip test (method E) are suitable for pipes with a nominal size of DN 500 and greater.The notched plate test (method F) is primarily intended for use with helically wound pipes of nominal size greater than DN 500 with a winding angle other than approximately 90°.Results from one method are not necessarily equal to the results derived from any of the alternative methods.If required, the initial circumferential tensile modulus can be determined by method A.

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