Tianlei Yao , Diansen Li , Hongmei Zuo , Xiaolong Jia , Lei Jiang
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引用次数: 0
摘要
细织穿刺 C/C 复合材料因其卓越的机械性能而被广泛应用于航空航天领域。报告了温度超过 2000 °C 和加载模式对弯曲性能和破坏机理的影响。研究发现,Y 方向挠曲的载荷-位移曲线呈现线性特征,但 Z 方向挠曲的载荷-位移曲线由于层间破坏而呈现非线性特征。Z 方向的弯曲性能明显高于 Y 方向。随着温度的升高,Y 向和 Z 向的抗弯强度都急剧增加,但抗弯模量却先上升后下降。与室温相比,在 2000 ℃ 时,Y 方向和 Z 方向的抗折强度分别增加了 55.6 % 和 188.5 %,而在 1200 ℃ 时,其相应的抗折模量分别增加了 14.3 % 和 40.4 %。Y 方向上的挠曲破坏主要沿 Z 纱列分布。由于缝隙更窄,复合材料连接更紧密,因此在温度升高时,破坏会逐渐蔓延到 Z-纱线上。而 Z 向弯曲试样的破坏裂纹主要分布在层间。随着温度的升高,拉伸 Z 向纱线的碳纤维单丝变得更加坚硬,断裂更加整齐。
Effect of temperature and loading mode on flexural properties and failure mechanisms of fine weave punctured C/C composites over 2000 °C
Fine weave punctured C/C composites are extensively utilized in aerospace applications owing to their superior mechanical properties. The effects of temperature over 2000 °C and loading mode on the flexural properties and failure mechanism were reported. It was found that the load-displacement curves of Y-direction flexure showed linear characteristics, but those of Z-direction flexure showed nonlinear characteristics because of interlayer failure. The flexural performances in the Z-direction were significantly higher than in the Y-direction. Both Y- and Z-directions flexural strengths increased dramatically, but flexural moduli initially climbed and subsequently declined with increasing temperature. In contrast with room temperature, the Y- and Z-direction flexural strengths increased by 55.6 % and 188.5 % at 2000 °C, while their corresponding flexural moduli increased by 14.3 % and 40.4 % at 1200 °C. Flexural failure in the Y direction was primarily distributed along the rows of Z-yarns. Due to narrower slits and tighter composite connections, failure gradually spreads over the Z-yarns at higher temperatures. While, the failure cracks of Z-direction flexural specimens were mainly distributed in the interlayer. As the temperature rose, the carbon fiber monofilaments of the pulled Z-direction yarns became harder linked, with neater breaks.
期刊介绍:
Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.