本解释性报告的第1节涵盖了设计部门的活动，并将其置于与最新技术相关的适当角度。这些活动主要与基于弹性理论的应力分析技术的发展及其实验验证有关。在本报告中，必须计算应力或测量的应力的重要性，也必须考虑考虑非弹性作用的分析。在压力容器封头领域（第1.3节），现在可以使用各种方法来计算无多个开口的任何实际封头形状的弹性应力。对计算结果的实验验证足以使人们对其有效性有很好的信心。对于普通设计师来说，计算方法过于繁琐，但有些表格和曲线适用于平面、圆锥形、半球形和椭球形封头。 PVRC的未来活动应包括编制更全面的图表，供设计师随时使用。

Section 1 of this Interpretive Report covers the activities of the Design Division and places them in their proper perspective relative to the state of the art. These activities have been largely concerned with the development of stress analysis techniques based on the theory of elasticity, and with their experimental verification. It is shown in this report that the significance of the stresses so calculated or measured must be evaluated and that analyses which consider inelastic action must also be used. In the area of pressure vessel heads (section 1.3), methods are now available for the calculation of elastic stresses in any practical shape of head without multiple openings. Experimental verification of the calculations is adequate to give good confidence in their validity. The calculational methods are too laborious for use by the average designer, but some tables and curves are available for flat, conical, hemispherical, and ellipsoidal heads. The future activities of PVRC should include the preparation of more comprehensive charts or tables for ready use by designers.