第1部分:暴露在缓慢增加的内压下的管道焊接三通使用支管和管路的厚度比和直径比，对1939年至1982年文献中关于管道焊接三通的冲击压力数据进行了关联。相关性表明，对于恒定直径比，爆破压力随厚度比的变化很小，但对于恒定厚度比，爆破压力随直径比的变化显著，但仅当厚度比向1增加时。第2部分:暴露在压力脉冲和冲击波下的有缺陷管道和分支连接。这项工作代表了有限实验的初步结果，随着压力变化率的增加，对有自然缺陷的管道进行破裂前泄漏标准测试。冲击波的动态压力变化似乎会使这些管道破裂，但只有在内部压力高于极限压力时，以及在裂纹附近发生大量塑性变形的管道上，才会发生这种情况。 支管-管路三通接头似乎比普通管道更容易受到冲击波的影响，因为动态压力会使交叉点区域而不是整个管路发生塑性变形。当在低于极限压力的内部压力下施加冲击波，但仅在发生实质性塑性变形后，冲击波可能会使具有自然胯部缺陷的T形三通断裂。这项工作还表明，裂纹扩展可以通过安装在裂纹外表面上的应变计进行监测。此外，冲击波的压力变化似乎取决于材料对冲击波的响应是弹性的还是塑性的。

Part 1: Welded Tee Connections Of Pipes Exposed To Slowly Increasing Internal PressureBurst pressure data available in the literature from 1939 to 1982 for welded tee connections of pipes have been correlated using both the thickness ratios and diameter ratios of branch and run pipe. The correlation indicates that a variation of burst pressure is weak with thickness ratios for constant diameter ratios but significant with diameter ratios for constant thickness ratios but only when the thickness ratio increases toward one.Part 2: Flawed Pipes And Branch Connections Exposed To Pressure Pulses And Shock WavesThis work represents preliminary findings of limited experimentation to test the leak-before-break criterion as the rate of pressure change increases for pipes with natural defects. Dynamic pressure variations of shock waves appear to rupture these pipes but only when applied at internal pressures above the limit pressure and to pipes with substantial plastic deformations in the vicinity of the cracks. Branch pipe-run pipe tee connections appear to be more vulnerable to shock waves than plain pipes, because the dynamic pressures deform plastically the region of the intersection rather than the whole run pipe. The shock waves may rupture the tees with natural crotch defects when they are applied at internal pressures which are below the limit pressure but after substantial plastic deformations only. The work indicates also that crack growth may be monitored by strain gages which are attached on the outer surface across a crack. Furthermore, the pressure variations of shock waves appear to depend on whether or not the material response to the wave is elastic or plastic.