疲劳寿命计算中的锅筒上下壁温差的影响

The Effect on the Temperature Difference between the Top and Lowest Points of the Drum in Fatique life Calculation

作为国标GB9222—88中“水管锅炉锅商低周疲劳寿命计算”的另一背景论文，主要阐述该计算第3章锅筒上下壁温差对疲劳寿命影响的理论模型与演算过程，通过基础原理分析与实例计算，说明它在整个寿命损耗中所起作用。

This paper is another one of the background theses in 'The fow cycle fatiqUe lifecalculation of the drum in water - tube boiler' which is of a nahonal standaId now. It explainsthe basic theory and deduction of the effect on the temperature difference between the top andlowest points of the durm in the No. 3 chapter of the calcuIation. We can get itS Portion in lifeexpenditure by means of theory analysis and real calculahon.