流体输送用热塑管道.用简单应变有槽抗拉试样(PSGT)测定模压材料的抗应力破裂性

[中文适用范围]： 本国际标准规定了在应力断裂试验中使用平面应变开槽拉伸样品测定管道和配件应用的热塑性树脂和化合物的失效时间的方法。 沟槽拉伸样本在单轴加载时产生双轴应力状态，这被认为是加压实壁塑料管中发现的应力条件。 轴向与横向应力之比近似于加压封端实壁管试件[4]-[7]。 这些样本生成的数据旨在用于确定管道和配件的成型材料以及实验管道树脂的抗应力断裂（失效时间）。 该方法也适用于难以测试的管道的应力断裂评估，例如较大直径的管道，包括其批量放行测试。 本国际标准无意取代 ISO 1167[2] 的应力断裂测试，该测试使用内部加压封端管道。 [外文原描述]： ISO 23228:2011 specifies a method for the determination of the time-to-failure of thermoplastics resins and compounds for piping and fitting applications by the use of a plane strain grooved tensile specimen in a stress-rupture test. The grooved tensile specimen produces a biaxial state of stress on uni-axial loading, which is taken to be indicative of the stress conditions found in pressurized solid-wall plastics pipes. The ratio of the stress in the axial direction to the transverse direction approximates that for a pressurized end-capped solid-wall pipe specimen. It is intended that the data generated on these specimens be utilized to determine the stress-rupture (time-to-failure) resistance of moulding materials for pipes and fittings as well as experimental piping resins. This method is also applicable to stress-rupture evaluations of pipes which are difficult to test, e.g. larger diameter pipes, including their batch release tests. ISO 23228:2011 is not intended to replace the stress-rupture test of ISO 1167, which uses internally pressurized end-capped pipes.