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| Comparative study on traditional thermo-mechanical coupling calculation method and ABAQUS direct thermo-mechanical coupling |
| Received:August 16, 2023 Revised:November 28, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20230816001 |
| KeyWord:thermo-mechanical coupling sequential coupling direct coupling finite element algorithm |
| Author | Institution |
| 苏雨茹 |
北京流体动力科学研究中心, 北京 |
| 王鑫 |
北京流体动力科学研究中心, 北京 |
| 李志辉 |
北京流体动力科学研究中心, 北京 |
| 柳治辉 |
北京流体动力科学研究中心, 北京 |
| 马强 |
四川大学 数学学院, 成都 |
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| Abstract: |
| To accurately predict the structural thermo-mechanical coupling response of spacecraft structures in strong aerodynamic/thermal environments is the key to analyze the re-entry process and predict the re-entry trajectories of the end-of-life spacecraft.In terms of structural thermo-mechanical coupling response analysis,some scholars have proposed finite element simulation methods based on various assumptions, and thermo-mechanical coupling calculation modules have been embedded in many mature commercial software.However,the uncertainty of assumptions and govering equations has led to the uncertainty of the computational accuracy and their applicability.In this paper,the basic equations of dynamic thermo-mechanical coupling have been summarized,and a detailed analysis of the coupling terms in heat conduction equation and its assumptions are provided.By comparing the calculation results of typical examples,it is found that there is a significant difference between the direct coupling calculation of ABAQUS and the finite element algorithm based on the traditional heat conduction equation when the initial temperature of the structures is zero.The basic equations for the thermo-mechanical coupling calculation of ABAQUS are derived and speculated,and a corresponding finite element algorithm is established.The derivation is verified through numerical examples.The results indicate that for direct coupling,only the initial temperature term is considered as the coupling term in the traditional heat conduction equation,while ABAQUS only considers the temperature increase term.Neither of the coupling terms is complete.When the initial temperature is higher than the temperature increase,the calculation results of the traditional thermo-mechanical coupling finite element algorithm based on the traditional heat conduction equation is more accurate.However,when the temperature increase is higher than the initial temperature,the finite element calculation that considers the temperature increase term,such as the direct coupling calculation of ABAQUS software,is more applicable. |
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