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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.7: Operations, Applications, and Components >AN IMPROVED METHOD FOR ASSESSING TRANSIENT THERMAL STRESSES AT A PRESSURE VESSEL NOZZLE
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AN IMPROVED METHOD FOR ASSESSING TRANSIENT THERMAL STRESSES AT A PRESSURE VESSEL NOZZLE

机译：一种评估压力容器喷嘴瞬态热应力的改进方法

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摘要

An improved method for assessing the transient thermal stress distribution in a pressure vessel cylindrical nozzle to sphere intersection is presented. The main purpose of the work is to develop a new method that will give a more versatile solution than the existing simplified method used in Annex G of PD5500:2003. In the first instance, Heisler's simplified approach is improved. Thereafter, three further methods are used for comparison, namely, an improved analytical method, a numerical method and the finite element method. This allows comparison of the three techniques in contrast with the existing classical solution.From this work, new improved charts are presented which extend the range of applicability of the curves in PD5500. The design curves have been verfied and extended to cover a wider range of applicability. In addition, the approach has been improved to included the step-type as opposed to the less severe ramp-type temperature variation in the fluid temperature from inside the shell to a final steady value.Finally, some case studies are presented which show the effects and improvements gained when using the new analysis method.
机译：提出了一种评估压力容器圆柱形喷嘴到球面相交处瞬态热应力分布的改进方法。这项工作的主要目的是开发一种新方法，该方法将提供比PD5500：2003附录G中使用的现有简化方法更通用的解决方案。首先，改进了海斯勒的简化方法。此后，使用另外三种方法进行比较，即改进的分析方法，数值方法和有限元方法。与现有的经典解决方案相比，这可以比较这三种技术。通过这项工作，提出了新的改进的图表，这些图表扩展了PD5500中曲线的适用范围。设计曲线已得到验证和扩展，以涵盖更广泛的适用范围。此外，该方法已得到改进，包括阶跃型，与从壳内部到最终稳定值的流体温度变化不那么严重的斜坡型温度变化相反。最后，提出了一些案例研究，这些结果表明了效果以及使用新分析方法获得的改进。

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