Abstract This paper developed a thermal–mechanical analysis model to describe the thermal shock behavior of ceramic sandwich structures (CSSs) with an auxetic honeycomb core. The transient temperature distribution and the associated thermal stress field of CSSs subjected to a thermal shock were determined. The crack growth behavior was discussed based on the thermal stress intensity factor (TSIF), crack location, face-sheet thickness, and internal cell orientation of the honewycomb core in detail. The results revealed that the auxetic and non-auxetic honeycomb cores have the similar temperature distribution profile however the auxetic honeycomb core can substantially reduce the overall thermal stress level. Furthermore, by equating the maximum TSIF and equivalent fracture toughness, the critical temperature for which the honeycomb core can sustain without failure was obtained. The results showed that CSSs with auxetic honeycomb core possessed a higher thermal shock resistance than that of non-auxetic. This research work was the first attempt to identify the the thermal shock resistance of CSSs with an auxetic honeycomb core. The results would provide fresh insight into the design and selection of CSSs applied in an extreme temperature environments.

中文翻译：

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具有拉胀蜂窝芯的陶瓷夹层结构的裂纹扩展行为和抗热震性

摘要 本文开发了一种热力学分析模型来描述具有拉胀蜂窝芯的陶瓷夹层结构 (CSS) 的热冲击行为。确定了受到热冲击的 CSS 的瞬态温度分布和相关的热应力场。基于热应力强度因子 (TSIF)、裂纹位置、面板厚度和蜂窝芯的内部单元取向详细讨论了裂纹扩展行为。结果表明，拉胀和非拉胀蜂窝芯具有相似的温度分布曲线，但拉胀蜂窝芯可以显着降低整体热应力水平。此外，通过将最大 TSIF 和等效断裂韧性相等，获得了蜂窝芯可以承受而不会失效的临界温度。结果表明，具有拉胀蜂窝芯的CSSs比非拉胀蜂窝芯具有更高的抗热震性。这项研究工作是首次尝试确定具有拉胀蜂窝芯的 CSS 的抗热震性。结果将为在极端温度环境中应用的 CSS 的设计和选择提供新的见解。