某产品上的高压软管在生产过程中发现:软管接头装配好后,不加任何外力,放在工作台上,过一段时间同心螺帽就出现断裂(见图1)。这种故障72年和83年各出现一次,均作为个别情况处理了。84年3～5月又连续出现四次,才引起工厂重视,军事代表和工厂一起进行了仔细的分析、研究、试验,并委托六二一所作了电镜扫描,情况如下: A product on the high-pressure hose found in the production process: hose fittings assembled, without any external force on the table, after a period of concentric nut break (Figure 1). This kind of failure occurred once in each of 72 and 83 years and was handled as a separate case. From March to May of 1984, there were four consecutive appearances that aroused the attention of the factory. The military representatives and factories carried out careful analysis, research and testing and commissioned the electronic scanning of June 21, as follows: