Abstract Carbon fiber reinforced SiC composite is a kind of promising high-temperature thermal protection structural material owing to the excellent oxidative resistance and superior mechanical properties at high temperatures. In this work, a novel design and fabrication process of lightweight C/SiC corrugated core sandwich panel will be proposed. The compressive and three-point bending of the C/SiC corrugated sandwich panels are conducted by experiment and numerical simulation. The relative density of as-prepared C/SiC sandwich panel and the density composite material are 1.1 and 2.1 g/cm3, respectively. As the density of the C/SiC sandwich panel is only 52.3% of the bulk C/SiC, suggesting that lightweight characteristic is realized. Moreover, the C/SiC sandwich panel manifests itself as linear-elastic behavior before failure in compression and the strength is as high as 15.1 MPa. The failure mode is governed by the core shear failure and panel interlayer cracking. The load capacity under the three-point bending C/SiC composite sandwich panel is 1947.0 N. The main failure behavior is core shear failure. The stress distribution under the compression and three-point bend was simulated by FE analysis, and the results of numerical simulations are in accordance with the experimental results.

中文翻译：

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C/SiC波纹芯夹芯板的制作工艺及力学性能

摘要 碳纤维增强碳化硅复合材料具有优异的抗氧化性能和高温力学性能，是一种很有发展前景的高温热防护结构材料。在这项工作中，将提出一种新型轻质 C/SiC 波纹芯夹芯板的设计和制造工艺。C/SiC波纹夹芯板的压缩和三点弯曲通过实验和数值模拟进行。所制备的 C/SiC 夹芯板和密度复合材料的相对密度分别为 1.1 和 2.1 g/cm3。由于 C/SiC 夹芯板的密度仅为块体 C/SiC 的 52.3%，表明实现了轻量化特性。而且，C/SiC夹芯板在压缩破坏前表现出线弹性行为，强度高达15.1 MPa。破坏模式由核心剪切破坏和面板层间开裂控制。三点弯曲C/SiC复合夹芯板承载力为1947.0 N，主要破坏行为为芯部剪切破坏。通过有限元分析模拟了压缩和三点弯曲下的应力分布，数值模拟结果与实验结果一致。