通过快速裂纹扩展发生断裂，没有明显的宏观变形。
Brittle fracture. Fracture that occurs by rapid crack propagation and without appreciable macroscopic deformation.
前言： 通过分析2003版与1995版国家标准《燃气用埋地聚乙烯管材》，介绍了2003版标准中新增的耐快速裂纹扩展和耐慢速裂纹增长两项重要性能。
The national standard of GB 1555B. 1 "Buried Polyethylene (PE) Piping Systems for the Supply of Gaseous Fuels Part 1: Pipes" of version 2003 and version 1995 were compared in this paper.
得到了快速扩展裂纹的动态应力强度因子。
Finally, the dynamic stress intensity factors of the fast-propagating crack is obtained.
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