压力容器分析设计方法的安全性和经济性讨论

Discussion of Safety and Efficiency of Analysis Method Used in Pressure Vessel Design

对于受内压简体上带径向接管的开孔补强设计计算,文献给出的大量计算和试验结果表明等面积法的计算结果是安全的,而应力分类设计方法的结果过于保守。通过对应力分类设计方法的假定条件和分析过程的讨论,分析了该方法的结果比等面积法保守的原因。然后,又对两种分析设计方法——应力分类方法以及EN13445所提出的直接法,在分析计算方法和失效判定条件两个方面的不同之处作了分析和比较,说明了这两个方法在EN13445标准中的关系,并对这两种分析设计方法用于压力容器设计的安全性和经济性进行了讨论。

With respect to the reinforcement of internal pressurized cylinder with radial nozzle, a lot of results from calculations and experiments demonstrated in references have shown that the result from area replacement method is safe, and the result from stress categorization method is over conservative. In this paper, through the discussion of assumed conditions used in analysis method and the calculation process, the causes making the result over conservative were analyzed. Then, for two analysis methods - stress categorization method and directive route provided in EN13445, the differences in two aspects of calculation method and failure determination conditions were analyzed and compared. The relation between two methods was indicated, and the safety and the efficiency of these two methods used in pressure vessel design were discussed.