玻璃钢热固性塑料（GRP）管.测定初始周向拉伸壁强度的试验方法

[中文适用范围]： 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) 管每单位长度的初始环向抗拉壁强度。 注：“环向抗拉强度”的另一个常用术语是“环向抗拉强度”，这两个表达方式可以互换使用。 爆破试验（方法 A）适用于所有类型和尺寸的管道。它被视为参考方法。但本文件中的所有方法都具有同等的有效性。如果可以通过比较试验程序建立方法 B 至 F 之间的任何相关性，则该方法可被视为参考方法。分割盘试验（方法 B）并不总是适用于具有螺旋缠绕增强层的管道。条带试验（方法 C）、改进条带试验（方法 D）和约束条带试验（方法 E）适用于公称尺寸为 DN 500 及以上的管道。缺口板试验（方法 F）主要用于公称尺寸大于 DN 500 且缠绕角度不为约 90° 的螺旋缠绕管。一种方法的结果不一定等于任何替代方法得出的结果。如果需要，可以通过方法 A 确定初始圆周拉伸模量。 [外文原描述]： 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.