An approach for bending and transient dynamic analysis of integrated thermal protection system with temperature-dependent material properties
An approach for bending and transient dynamic analysis of integrated thermal protection system with temperature-dependent material properties
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DOI：
10.1016/j.compstruct.2016.09.047
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发表时间：
2017
影响因子：
6.3
通讯作者：
Liangxian Gu;Yifan Wang;S. Shi;Dai Cunxi
中科院分区：
文献类型：
--
作者：
Liangxian Gu;Yifan Wang;S. Shi;Dai Cunxi
提出了一种结合均匀化技术的C0高阶分层有限元模型，用于综合热防护系统（ITPS）壁板的弯曲和瞬态动力分析。ITPS板均匀化作为一个等效的夹层板，并推导出整个面板的约化温度场。提出了一种基于能量法和卡氏定理的梯形波纹芯力学性能的先进解析等效模型，该模型考虑了材料性能随温度变化的影响。建议分层理论，这是为夹层板，假设线性，二次和三次多项式分布的位移为中间层和线性多项式分布的位移为顶部和底部层。在分层理论中考虑了横向正应变的影响。等效夹层板采用四节点等参单元，每个节点具有16个自由度。通过与三维有限元分析结果的比较，验证了该方法的准确性。结果表明，该方法所需的计算工作量显着减少，并同意与有限元结果。
A C0higher-order layerwise finite element model combined with homogenization techniques for bending and transient dynamic analysis of integrated thermal protection system (ITPS) panel is presented. The ITPS panel is homogenized as an equivalent sandwich plate, and a reduced temperature field for the entire panel is derived. An advanced analytical equivalent model based on energy approach and Castigliano’s theorem for the mechanical properties of the trapezoidal corrugated core is presented, which considers the effects of temperature-dependent material properties. The proposed layerwise theory which is developed for a sandwich plate, assumes linear, quadratic and cubic polynomial distributions of displacements for middle layer and linear polynomial distributions of displacements for top and bottom layers. And the effect of transverse normal strains is taken into account in the layerwise theory. A four-noded isoparametric element with 16 degrees of freedom per node is employed to model the equivalent sandwich plate. The accuracy of the proposed method is verified by comparison with the results by three-dimensional (3D) finite element analysis. It has been shown that the proposed method requires significantly less computational effort and agrees well with the finite element results.