ASMECODEI卷中圆筒体壁厚的计算式

学习运用公认的第三强度理论和塑性失效准则对承受内压的厚壁圆筒体应力分析，可得到与ASMECODEI卷2007版在新增A-317条文推出的相同的以指数形式表达的圆筒体壁厚计算式。通过分析认为，在工程实用上壁厚指数计算式和过去传统使用的壁厚简化计算式都可方便使用，计算结果在目前锅炉设计常用范围内差别很小，但随着管子直径和壁厚增大，两者计算结果差别会增大。无论薄壁还是厚壁的圆筒体，以指数形式表达的圆筒体壁厚计算式理论上更精确。

Cylinder Wall Thickness Calculation in A-317 of ASME Code Section I Power Boilers （2007 Edition）

Through the study of the Third Strength Theory and the Plasticity Failure Rule and their applications to the stress analysis of thick wall cylinders bearing inner pressure, a formula for the calculation of cylinder wall thickness can be deduced, which is expressed in exponential form and is exactly the same as that of A-317 of ASME Code Section I （2007 Edition ）. Both this formula and the traditional simplified formula can be adopted in actual projects. Their calculation results show that there is less difference within the common design scope of boilers. However, along with the increase of cylinder diameter and wall thickness, the difference between the calculation results of these two formulas will be enlarged. For thick wall cylinder or thin wall cylinder, the formula for its wall thickness calculation which is expressed in exponential form is more precise theoretically.