Finite Element Simulation And Cluster Analysis Of Thermal Insulation Properties Of Polymer Foam Materials

Polymer foaming materials generally refer to microporous materials based on various polymers such as plastics and rubber,which have a large number of bubbles inside.They can also be regarded as composites with gas as filler.Polymer foams have attracted extensive attention because of their good thermal insulation,sound insulation and mechanical properties.With the development of foaming technology,double distribution or even multi distribution cell structure has become possible,and it is found that it has good thermal insulation performance,but its thermal insulation excitation is still not fully understood.Therefore,this paper uses finite element simulation to calculate the relationship between the thermal insulation performance of polymer foamed new materials and the substrate and void distribution,and then establishes the relationship between the substrate,pore distribution and performance.However,finite element simulation can often give a variety of possible material design schemes for a certain thermal insulation performance requirement.There is still no exact method to solve this problem.Therefore,this paper then summarizes the published experimental data of thermal insulation performance of polymer foam materials,combined with cluster analysis,classifies the thermal insulation performance by using pore density,and preliminarily explores the feasibility of this scheme.It is expected to provide a screening scheme for the feasibility of finite element simulation prediction results.The research contents are as follows:Firstly,the 2-dimensional heat transfer model of polymer foamed materials is constructed by using the multi physical field finite element analysis software,which realizes the reasonable description of the heat conduction phenomenon of polymer foamed materials from the material cell structure and distribution and material properties,enriches and develops the energy transfer process of polymer foamed materials during heat conduction,The effective thermal conductivity in various possible material designs is systematically calculated.The effects of monodisperse,bisdisperse and polydisperse pore distribution on the thermal properties of the materials are analyzed,and the opening and closing of pores are systematically analyzed.The results show that the heat insulation performance of the materials with uniformly distributed pores is better than that of the materials with randomly arranged pores.When the porosity is between 30%-70%,the thermal insulation of the material with double distribution cell structure is better than that of the material with single distribution cell structure.With the increase of porosity and the proportion of large pore area,the thermal insulation performance of the material also shows a trend of gradual enhancement.In the case of the same porosity,with the increase of the proportion of large pore area,the thermal insulation performance of the material with three distributed cell structure is gradually enhanced.The relevant calculation provides a design direction for improving the thermal properties of polymer foams.Secondly,the published experimental data of thermal insulation performance of polymer foam materials are summarized in this paper.Combined with cluster analysis,the thermal insulation performance is classified by pore density,and it is found that the different number of clusters has a great impact on the clustering results.In addition,the correlation between clustering results and pore density is not high,which shows that it is difficult to effectively distinguish the thermal insulation properties of complex foamed materials by using the classification of a single variable.In short,this paper uses finite element simulation to establish the relationship between the thermal insulation performance of polymer foam materials and the substrate and pore distribution,and preliminarily attempts to distinguish the thermal insulation performance of polymer foam materials by cluster analysis,so as to screen whether the finite element simulation prediction results are implementable,which provides a new driving force for improving the product design of polymer foam materials.