| 张佳乐,耿小亮*,王迎芬,梁恒亮,黄雷,薛志远,阿依巴尔,李欣.单侧加热条件下带石墨膜热防护复合材料力学性能的试验研究[J].实验力学,2024,39(3):323~331 |
| 单侧加热条件下带石墨膜热防护复合材料力学性能的试验研究 |
| Experimental study on mechanical properties of composite with thermal protection by coating highly oriented graphite films under heating on single side |
| 投稿时间：2023-07-18 修订日期：2023-08-26 |
| DOI：10.7520/1001-4888-23-141 |
| 中文关键词: 聚酰亚胺 石墨膜 复合材料 热防护体系 单侧加热 |
| 英文关键词:polyimide graphite film composite material thermal protection system heating on single side |
| 基金项目:装备预研重点实验室基金项目(6142704200405) |
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| 中文摘要: |
| 聚酰亚胺基体碳纤维复合材料具备高温下轻质高强的力学特性，在飞机发动机机匣及外调节片等结构上有广泛的应用前景。这类薄壁结构两侧温度通常有显著差异，目前对这种单侧高温下复合材料力学特性方面的研究相对较少。本文以耐高温的聚酰亚胺树脂基碳纤维增强复合材料层合板为研究对象，单侧制备石墨膜作为复合材料的热防护体系。制备了［0］8和［45/-45/0/90］2s两种铺层角度的复合材料试验件，并开展了在25℃(室温)和高温单侧面热源加热下的纵向拉伸与开孔拉伸试验。试验结果表明，高温下纵向拉伸破坏模式和开孔拉伸破坏模式与常温下的破坏模式相比没有差别，纵向拉伸破坏模式为纤维断裂，开孔拉伸破坏模式呈现基体断裂、纤维断裂及拔出的混合特征；在相同温度载荷下，有石墨膜试验件的非加热面温度略低；相比不带石墨膜的复合材料，石墨膜的热防护特性对主要依赖纤维承载的纵向拉伸强度并不产生显著的增强效果，而对于同时依赖纤维及基体的开孔拉伸强度在较高温度区间时其承载能力有显著提高。 |
| 英文摘要: |
| Polyimide resin-based composites have the mechanical properties of lightweight and high strength at high temperature, which have a wide application prospect of aircraft engine casings and external tuning segments. There is usually a significant difference in temperature between the two sides of this kind of thin-walled structure, there are relatively few researches on the mechanical properties of this kind of composite under the condition of high temperature on one side. This paper took the high temperature resistant carbon fiber reinforced polyimide composites laminates as the research object, and unilateral preparation of graphite film as a thermal protection system of composite materials. Composite materials specimen with two lay-up angles of [0]8 and [45/-45/0/90]2s were prepared. Longitudinal tensile and open-hole tensile tests were carried out at 25℃ and high temperature with heating on single side. The test results show that longitudinal tensile failure mode and open hole tensile failure mode at high temperatures does not show evident differences with the failure modes at room temperature. The longitudinal tensile damage mode is fiber fracture, and the open hole tensile damage mode shows matrix fracture, fiber fracture and pull-out. At the same temperature loading, the temperature of the unheated surface of the specimen with graphite film is slightly lower, compared with composites without graphite film. The thermal protection properties of graphite film does not produce significant enhancement effect on the longitudinal tensile strength, which is mainly dependent on the fiber bearing. For the open hole tensile strength, which depends on both the fiber and matrix, there is a significant increase in the bearing capacity at the higher temperature. |
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