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Simplified calculation method for coupled thermal--mechanical stress of drum using beam elements
  • +3
  • yanjun Li,
  • zhenhua Zhang,
  • qingpeng Zeng,
  • chenshuo Li,
  • jianxin Shi,
  • guolei Zhang
yanjun Li
Haerbin Engineering University
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zhenhua Zhang
Haerbin Engineering University
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qingpeng Zeng
Haerbin Engineering University
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chenshuo Li
Haerbin Engineering University
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jianxin Shi
Haerbin Engineering University
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guolei Zhang
Haerbin Engineering University
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Abstract

The drum is the core part of a supercharged boiler that is prone to fatigue damage due to the dual action of thermal and mechanical stress. However, owing to its complex structure, complete modeling calculation of the drum requires considerable computational resources. Therefore, based on the basic theory of beam elements, we propose a simplified method using beam elements in place of solid tubes and evaluate the feasibility of this method. The results demonstrate that the simplified method reduced the overall mesh number of the model by 67.19% and the calculation time by 68.08%. Moreover, compared to the solid model, the maximum relative errors of stress and displacement were only 3.44% and 5.16%. Considering the dispersion of low-cycle fatigue life, we applied a statistical approach to the fatigue life assessment of the drum, and obtained the probability of failure corresponding to the fatigue life of the drum under the given operating conditions. This method provides an important basis for the systematic evaluation of fatigue life under various operating conditions and the prediction of failure occurrence.