| 苏雨茹,王鑫,李志辉,柳治辉,马强.传统热力耦合计算方法与ABAQUS直接热力耦合对比研究[J].计算力学学报,2025,42(2):249~257 |
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| 传统热力耦合计算方法与ABAQUS直接热力耦合对比研究 |
| Comparative study on traditional thermo-mechanical coupling calculation method and ABAQUS direct thermo-mechanical coupling |
| 投稿时间：2023-08-16 修订日期：2023-11-28 |
| DOI：10.7511/jslx20230816001 |
| 中文关键词: 热力耦合 顺序耦合 直接耦合 有限元算法 |
| 英文关键词:thermo-mechanical coupling sequential coupling direct coupling finite element algorithm |
| 基金项目:国家重点研发计划基金(2022YFA100510)资助项目. |
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| 摘要点击次数: 14 |
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| 中文摘要: |
| 准确预测航天器结构在强气动力/热环境下的结构热力耦合响应,对于航天器寿命末期陨落再入过程分析及再入轨迹预报等十分关键。结构热力耦合响应分析方面,不仅有学者们基于各种假设提出的有限元模拟方法,而且热力耦合计算模块已嵌入很多大型商业软件,然而条件假设和控制方程的不明确,导致无法确定商软计算结果的准确性和其适用性。本文对动态热力耦合基本控制方程进行了梳理,对其热传导方程中的耦合项和采用的假设进行了详细分析。通过典型算例计算结果对比发现,当初始温度为0时,ABAQUS的直接耦合计算和以传统热传导有限元基本方程为基础的有限元算法的计算结果有较大差异。对ABAQUS的热力耦合计算的基本控制方程进行了推导和推测,并建立了相应的有限元算法,通过算例计算结果进行了验证。研究结果表明,对于直接耦合,传统热传导有限元基本方程的耦合项只考虑了初始温度项,而ABAQUS则只考虑了温升项,两者的耦合项都不完全。当初始温度高于温升时,以传统热传导有限元基本方程为基础的传统热力耦合有限元算法的计算结果更准确,而当温升高于初始温度时,采用考虑温升项的有限元计算,如ABAQUS软件的直接耦合计算则更为适用。 |
| 英文摘要: |
| 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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