本出版物介绍了压力容器封头在内部压力下弹塑性行为的研究结果。这项工作由压力容器研究委员会赞助，为期两年，第一年致力于椭球封头，第二年致力于球面封头。巴特尔的计算机程序NONLEP是为旋转薄壳的弹塑性分析而开发的，它被应用于一组承受内压的典型头部几何形状。该程序包括大变形和应变硬化的影响，因此可以预测封头的额外承压能力，超过极限分析预测的坍塌压力。给出数值结果细节的曲线以附录形式组织，出版物的主体部分专门讨论分析。

This publication presents the results of an investigation of the elastic-plastic behavior of pressure vessel heads under internal pressure. The work was sponsored over a two-year period by the Pressure Vessel Research Committee with the first year being devoted to ellipsoidal heads and the second year to torispherical heads. Battelle's computer program, NONLEP, developed for elastic-plastic analysis of thin shells of revolution, was applied to a set of typical head geometries subjected to internal pressure. This program includes effects of large deformations and strain hardening and thus it was possible to predict the additional pressure-carrying capability of heads beyond the collapse pressure predicted by limit analyses. Curves giving details of the numerical results are organized as appendices, with the main body of the publication devoted to discussion of the analyses.