橡胶,塑料软管和管材.曲挠性和刚性的测量.第2部分:低于环境温度的弯曲试验

[中文适用范围]： 本文件规定了两种测量刚度的方法和一种确定橡胶和塑料软管和管材在低于环境温度下弯曲到特定半径时的柔韧性的方法。 方法 A 适用于孔径不超过 25 毫米（含 25 毫米）的不可塌陷橡胶和塑料软管和管材。 该方法提供了一种测量当温度从标准实验室温度降低时软管或管道的刚度的方法。 方法 B 适用于孔径最大为 100 毫米的橡胶和塑料软管和管材，并提供了一种评估软管或管材在指定的低于环境温度下绕心轴弯曲时的柔韧性的方法。 它也可以用作常规质量控制测试。 方法C适用于内径100毫米及以上的橡胶和塑料软管和管材。 该方法提供了一种在低于环境温度下测量软管和管道刚度的方法。 此方法仅适用于不可折叠的软管和管道。 [外文原描述]： This document specifies two methods for measuring the stiffness and one method for the determination of the flexibility of rubber and plastics hoses and tubing when they are bent to a specific radius at sub-ambient temperatures. Method A is suitable for non-collapsible rubber and plastics hoses and tubing with a bore of up to and including 25 mm. This method provides a means of measuring the stiffness of the hose or tubing when the temperature is reduced from a standard laboratory temperature. Method B is suitable for rubber and plastics hoses and tubing with a bore of up to 100 mm and provides a means of assessing the flexibility of the hose or tubing when bent around a mandrel at a specified sub-ambient temperature. It can also be used as a routine quality control test. Method C is suitable for rubber and plastics hoses and tubing with a bore of 100 mm and greater. This method provides a means of measuring the stiffness of the hose and tubing at sub-ambient temperatures. This method is only suitable for hoses and tubing which are non-collapsible.