Temperature Field and Thermal Stress Analysis of External Wall Insulation Structure Based on Finite Difference Method and Ansys
The external wall insulation system using EPS(Expanded Polystyrene)boards,commonly used in regions with hot summers and cold winters,often encounters durability issues.In this article,numerical calculations and simulation analysis are conducted to investigate the temperature field and temperature-induced stress distribution of the external insulation system under different environmental conditions.The research findings indicate that under typical temperature conditions,the external wall insulation system effectively blocks the heat transfer from the external environment,ensuring comfortable indoor temperature.However,it is observed that temperature-induced stresses tend to concentrate in the middle area of the system,with maximum displacement occurring at the edges and corners.This phenomenon may lead to aging damage such as delamination,expansion,cracking,and even detachment of the insulation boards.The analysis results show that for every 10 degrees Celsius decrease in temperature on the outside of the extemal wall,the maximum temperature stress of the structure decreases by 23.71%on average,and the maximum displacement decreases by 23.63%on average.Additionally,with seasonal temperature changes,the stress and displacement of the wall will also change,and the most significant phenomenon is the change of stress direction and displacement direction.Based on the analysis results,a series of conclusions have been drawn,which have important implications for improving the materials and construction techniques of the external wall insulation system,as well as enhancing its reliability and safety.
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