由于迫切需要获得压力容器开口附近应力的信息，在过去九年中进行了一项相当全面的实验计划。预计研究结果将对以下三个目的有价值: （1） 为了评估几何参数和局部加固方法的影响，（2）为最常用的压力容器类型的设计师和应力分析人员提供可立即使用的具体信息，以及（3）提供有助于开发或检查应力理论解有效性的实验数据。 整个项目由压力容器研究委员会的加强开口小组委员会协调，包括M.M.Leven在西屋研究实验室进行的类似光弹性试验。在某些情况下，整体系列中的部分模型由Leven测试，部分模型由作者测试。因此，这两个系列中的车型都包含在本公告开头给出的综合索引中。Leven的结果在参考文献（1）中单独报告，也在本公告中。 随着每个模型的数据可用，编制了完整的汇总表，并广泛分发给感兴趣的人。附录中包含一整套汇总表。前几个模型的结果在WRC公告51中给出。J.L.Mershon根据1962年提供的信息编写了一份全面的解释性报告，他还编写了一份续集报告，其中包括对该项目中所有模型的分析。鉴于上述因素，本报告的范围将仅限于对实验技术的描述、结果的介绍以及对可能的准确性的讨论。 应该提到的是，压力容器出口附近应力的完整描述是一个极其复杂的问题。对于圆柱形容器尤其如此。即使对于具有轴对称性的球形容器，问题也不简单，因为通常会出现多个应力集中区域。因此，仅列出每个模型的最大应力或应力集中系数是不够的。给出了每个模型在外表面和内表面上的完整应力分布曲线。 这些数据应该有更高的概率满足设计师和数学家的需求。 对于一些模型，在关键位置计算了从内表面到外表面的应力分布。从这些结果可以得到应力合成和应力偶，并与由壳理论导出的解进行比较。

Due to the urgency of gaining information on stresses near openings in pressure vessels, a rather comprehensive experimental program has been conducted over the past nine years. It was anticipated that the results of the research would be valuable for the following three purposes: (1) To evaluate the effect of geometric parameters and methods of local reinforcement,(2) To provide specific information that may be of immediate use to designers and stress analysts for types of pressure vessels most commonly used, and(3) To provide experimental data which will be useful in developing or checking the validity of theoretical solutions for stresses. The over-all program was coordinated by the Reinforced Openings Subcommittee of the Pressure Vessel Research Committee and included similar photoelastic tests conducted by M. M. Leven at the Westinghouse Research Laboratories. In some cases part of the models in an integral series were tested by Leven and part of them were tested by the authors. Consequently, models in both series are included in a combined index given at the beginning of this Bulletin. Leven's results are reported separately in reference (1), also located in this Bulletin. As data became available for each model, complete summary sheets were prepared and were widely distributed to interested persons. A complete set of summary sheets is included in the Appendix. Results of the first few models were given in WRC Bulletin 51. A comprehensive interpretive report based upon information available in 1962 was written by J. L. Mershon who has also prepared a sequel report which includes analyses of all models in the program. In view of the above listed factors, the scope of this present report will be limited to a description of the experimental techniques, presentation of the results, and a discussion of the probable accuracy. It should be mentioned that the complete description of stresses near an outlet in a pressure vessel is an extremely complex matter. This is especially true of cylindrical vessels. Even for spherical vessels, which possess axial symmetry, the problem is not simple because more than one area of stress concentration usually occurs. Hence the mere listing of the maximum stress or the stress concentration factor for each model would not be sufficient. Curves giving complete stress distributions on outer and inner surfaces are given for each model. Data from these should have a higher probability of satisfying the needs of designers and mathematicians. For some of the models, the stress distribution across the thickness from inside to outside surfaces was computed at key locations. From these results the stress resultant and stress couple may be obtained and compared with solutions derived by shell theory.