对T-1钢制PVRC 5号容器在疲劳试验期间的灾难性失效进行了研究。给出了疲劳试验程序的相关细节，并讨论了失效材料的冶金和机械试验结果。容器的制造和检验符合ASME规范标准和最佳商业惯例。容器的疲劳寿命足够，但快速扩展断裂导致的失效是意外的。调查显示，5号PVRC容器中的材料是典型的火箱质量T-1钢，终端断裂的起始和扩展主要与焊接区有关。

A study of the catastrophic failure during fatigue testing of PVRC Vessel No. 5, of T-1 steel, was conducted. Pertinent details of the fatigue testing procedure are given, and metallurgical and mechanical test results on failure material are discussed. The fabrication and inspection of the vessel conformed to ASME Code Standards and the best commercial practice. The fatigue life of the vessel was adequate but the failure by a fast propagating fracture was unexpected. The investigation disclosed that the materials in PVRC Vessel No. 5 were typical for firebox quality, T-1 steel, and the initiation and propagation of the terminal fracture were primarily associated with weld zones.