Micromechanical analysis of composite corrugated-core sandwich panels for integral thermal protection systems
Micromechanical analysis of composite corrugated-core sandwich panels for integral thermal protection systems
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DOI：
10.2514/1.26779
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发表时间：
2007-09-01
期刊：
影响因子：
2.5
通讯作者：
Blosser, Max L.
中科院分区：
文献类型：
--
作者：
Martinez, Oscar A.;Sankar, Bhavani V.;Blosser, Max L.
研究了一种波纹夹芯板作为整体热防护系统的潜在候选材料。这种多功能一体化热防护系统概念可以保护航天器免受极端再入温度的影响，并具有承载能力。波纹芯由两个由两个斜板隔开的薄而平的薄板组成。讨论了这种新型一体化热防护系统的优点。将夹层结构理想化为等效正交异性厚板连续体。用能量法计算了结构的拉伸刚度矩阵[A]、耦合刚度矩阵[B]、弯曲刚度[D]、横向剪切刚度项A(44)和A(55)。利用剪切变形板理论，得到了板响应的闭合解。讨论了腹板角度变化对板的刚度和最大挠度的影响。计算结果与三维有限元分析结果吻合较好，计算量和时间都大大减少。这项研究表明，矩形腹板导致了较弱的拉伸、弯曲和A55刚度，而对于三角形波纹芯材，中心板的挠度最小。在这项研究中开发的细观力学分析程序被用来确定夹层板的每个组件(表面和腹板)在均匀压力载荷下的应力。
A composite corrugated-core sandwich panel was investigated as a potential candidate for an integral thermal protection system. This multifunctional integral thermal protection system concept can protect the space vehicle from extreme reentry temperatures, and possess load-carrying capabilities. The corrugated core is composed of two, thin, flat sheets that are separated by two inclined plates. Advantages of this new integral thermal protection system concept are discussed. The sandwich structure is idealized as an equivalent orthotropic thick-plate continuum. The extensional stiffness matrix [A], coupling stiffness matrix [B], bending stiffness [D], and the transverse shear stiffness terms A(44) and A(55) were calculated using an energy approach. Using the shear-deformable plate theory, a closed-form solution of the plate response was derived. The variation of plate stiffness and maximum plate deflection due to changing the web angle are discussed. The calculated results, which require significantly less computational effort and time, agree well with the three-dimensional finite element analysis. This study indicates that panels with rectangular webs resulted in a weak extensional, bending, and A55 stiffness and that the center plate deflection was minimum for a triangular corrugated core. The micromechanical analysis procedures developed in this study were used to determine the stresses in each component of the sandwich panel (face and web) due to a uniform pressure load.