Damage Characteristics of T800 CFRP Laminates Under Typical Impacts
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摘要: 针对飞行器常用的碳纤维增强复合材料层合板(CFRP)抗冲击性能研究需求,对T800/3200 CFRP层合板进行球形破片侵彻试验与静爆试验,使用CT扫描技术与毁伤评估理论加以深入分析,研究了T800/3200 CFRP层合板在破片侵彻与爆炸冲击波两种典型载荷下的损伤特性与性能,并与航空制造业常用的2024-T3航空铝进行了试验对比。研究表明:T800/3200 CFRP层合板遭受球形破片侵彻后将产生近似台体的脱层损伤区域,且台体体积随着破片的侵彻速度增加损伤区域不断变小;T800/3200 CFRP层合板抵抗破片冲击载荷的能力不及航空铝板,吸收动能的能力约为航空铝板一半;但其抗爆性能强于航空铝,在航行任务中更有助于保证飞行器的安全。该研究可为航空器安全性和可靠性的提升提供一定理论与数据支持。
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Abstract: In response to the research demand for the impact resistance of carbon fiber reinforced polymer laminates (CFRP) commonly used in aircrafts, spherical fragment penetration and static blast tests were conducted on T800/3200 CFRP laminates, with CT scanning technology and damage assessment theories used for further analysis. The damage characteristics and performance of the T800/3200 CFRP laminates under two typical loads—fragment penetration and explosive shock waves—were studied and compared with the 2024-T3 aluminum commonly used in the aviation manufacturing industry. Spherical fragment penetration tests and static blast tests were conducted on T800/3200 CFRP laminates. Two control groups were established: tungsten fragments impacting aerospace aluminum plates and tungsten steel fragments striking CFRP laminates. Impact velocities and residual velocities were precisely measured using high-speed photography. During fragment penetration tests, relationships among incident velocity, residual velocity, and energy absorption were analyzed based on the Recht-Ipson ballistic limit model. The internal damage morphology of CFRP targets was examined in detail using high-resolution CT scanning technology to characterize delamination patterns and progressive failure across different depths and laminates. For blast tests, the damage morphology and maximum deflection of target plates were systematically observed and recorded. The blast resistance of CFRP laminates and aluminum plates was quantitatively compared using advanced mathematical methods incorporating boundary condition equivalence and overpressure equivalence principles to ensure a fair and accurate comparison. The results show that after spherical fragment penetration, the T800/3200 CFRP laminate generates a delamination damage zone resembling a truncated cone, with the volume of the cone decreasing as the fragment's penetration speed increases. The T800/3200 CFRP laminate exhibits weaker performance against fragment penetration compared to aerospace aluminum but offers significantly enhanced blast resistance. This characteristic makes it more effective in maintaining structural safety and aerodynamic stability during flight missions under explosive threats. The findings provide theoretical and empirical support for improving the safety and reliability of aerospace vehicles through optimized material selection and structural design. -
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