Abstract Structural sandwich panels with graphitic-foam cores are considered for applications where extraordinary thermal conductivity of the core material may offer unique benefits for challenging thermoelastic structures. Sandwich panels constructed with carbon-fiber facesheets and graphitic-foam cores could provide a viable solution for “optical benches,” which require high stiffness and thermal stability; such panels should exhibit lower susceptibility to thermal distortion than sandwich panels constructed with traditional honeycomb cores or monolithic plates of materials having low thermal conductivity. Specimens of sandwich panels were fabricated with graphitic-foam cores, aluminum facesheets and carbon-fiber facesheets, as well as with honeycomb cores for the purpose of comparing behaviors. Measurements of plate bending behavior and through-thickness thermal conductivity were performed with these specimens; resulting data were used to validate analytical models. Separate testing was conducted to measure the shear modulus of graphitic foam in simple shear, as that strongly influences the bending behavior of sandwich panels, and has not appeared previously in the published literature. Out-of-plane distortion of sandwich panels subjected to asymmetric thermal loading was measured using an optical surface profilometer. Results of these measurements demonstrate that the use of graphitic foam as core material in sandwich panels greatly reduces their tendency to experience thermal distortion.

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具有石墨泡沫芯的夹芯板的热机械性能

摘要 具有石墨泡沫芯的结构夹层板被考虑用于芯材料非凡的导热性可能为具有挑战性的热弹性结构提供独特优势的应用。由碳纤维面板和石墨泡沫芯构成的夹心板可以为需要高刚度和热稳定性的“光学平台”提供可行的解决方案；与用传统蜂窝芯或低导热材料的整体板构成的夹层板相比，这种板对热变形的敏感性较低。为了比较性能，夹芯板的样品由石墨泡沫芯、铝面板和碳纤维面板以及蜂窝芯制成。对这些试样进行了板弯曲行为和全厚度热导率的测量；结果数据用于验证分析模型。进行了单独的测试以测量石墨泡沫在简单剪切下的剪切模量，因为这强烈影响夹层板的弯曲行为，并且之前未在已发表的文献中出现过。使用光学表面轮廓仪测量承受不对称热载荷的夹层板的面外变形。这些测量结果表明，在夹心板中使用石墨泡沫作为芯材可大大降低它们经历热变形的趋势。进行了单独的测试以测量石墨泡沫在简单剪切下的剪切模量，因为这强烈影响夹层板的弯曲行为，并且之前未在已发表的文献中出现过。使用光学表面轮廓仪测量承受不对称热载荷的夹层板的面外变形。这些测量结果表明，在夹心板中使用石墨泡沫作为芯材可大大降低它们经历热变形的趋势。进行了单独的测试以测量石墨泡沫在简单剪切下的剪切模量，因为这强烈影响夹层板的弯曲行为，并且之前未在已发表的文献中出现过。使用光学表面轮廓仪测量承受不对称热载荷的夹层板的面外变形。这些测量结果表明，在夹心板中使用石墨泡沫作为芯材可大大降低它们经历热变形的趋势。使用光学表面轮廓仪测量承受不对称热载荷的夹层板的面外变形。这些测量结果表明，在夹心板中使用石墨泡沫作为芯材可大大降低它们经历热变形的趋势。使用光学表面轮廓仪测量承受不对称热载荷的夹层板的面外变形。这些测量结果表明，在夹心板中使用石墨泡沫作为芯材可大大降低它们经历热变形的趋势。