ONR25194DeterminationoftheresistancetoslowcrackgrowthofPEwithCRBspecimens翻译.docVIP

Determination of the resistance to slowcrack growth of polyethylene withcracked round bar (CRB) specimens 聚乙烯CRB试样抵抗慢速裂纹扩展的测试 Content 目录 FOREWARD前言 Scope范围 Normative references引用标准 Terms and definitions术语和定义 Principle原理 Test equipment测试设备 Test specimen测试试件 Test procedure测试程序 Test report测试报告 Comparison of different specimen geometries不同试样几何形状对比 Bibliography参考文献 Foreword前言The knowledge about the resistance against long-term failure mechanisms caused by crack initiation and slowcrack growth (SCG) is an important information for the ranking and pre-selection of thermoplastic materials,especially for long-term applications like buried pipes made of polyethylene. Several tests to determine therelevant failure mechanisms are available today, where elevated temperatures and also the combination withstress cracking liquids are used to decrease the time frame for testing. 由裂纹萌生和慢性裂纹扩展引起的抵抗长期失效机制的认识，对于热塑性材料（特别是如埋于地下长期使用的聚乙烯管）的分类和预选，是一项重要信息。现阶段有测定相关失效机制的实验可利用，在这些实验中，通过提高实验温度和添加应力开裂液缩短了实验持续时间。 However, developments in modern raw materials have led to a significant increase of the material resistance against crack initiation and SCG, so that testing with available methods exceeds practical time frames. Therefore new acceleration methods preferably at application relevant temperatures and without additional time reducing liquids are required. 然而，现代原材料的发展使得材料对于抵抗裂纹萌生和慢速裂纹扩展，有显著提高，使得已有方法的测试时间超出了实际合理时间范围。因此，现在要求应用一种新型快速合适的且在相关温度下无需添加时间缩短液的实验方法。 This ONR, elaborated by the Technical Committee 005 “Thermoplastic pipes for the transport of fluids andgases”, provides a test method to achieve a significant decrease of testing time, even at ambient temperatures of 23 °C, which is very close to those of many applications, and will not change the structural status ofthe polymer. On the one hand acceleration of material testing is reached by the specimen geometry. On theother hand the cyclic load is responsible for relatively short testing times. ONR提供了一种方法以实现测试时间的显著减少，甚至在周围环境温度23