摘要
针对涂覆聚氨酯涂层复合材料层合板低速冲击的损伤问题,提出了基于复合材料层合板三维渐进累积损伤的数值分析方法和聚氨酯涂层的屈服损伤准则。首先,建立了冲蚀作用下聚氨酯涂层-碳纤维增强复合材料层合板的损伤数值模型,编写了Vumat子程序。然后,参照ASTM D7136试验标准,对涂覆1、2 mm聚氨酯涂层试样和无涂层试样进行了多种能量冲击试验。同时,利用所提损伤模型研究了纤维损伤、基体损伤、分层等主要损伤的形成原因和扩展规律,揭示了聚氨酯涂层吸收冲击能量的机制。结果表明,所提损伤模型计算得到的力学响应结果与试验结果吻合度较高,证明了所提模型的正确性。并通过对比试验证明了聚氨酯涂层对碳纤维复合材料层合板抗冲击损伤能力的提升效果。研究结论可为飞机防护涂层设计提供参考。
To address the issue of damage caused by low-speed impacts on composite material laminates coated with polyurethane coating,a numerical analysis method based on three-dimensional progressive cumulative damage in composite laminates and a yield damage criterion for polyurethane coatings was proposed.Firstly,a damage numerical model of polyurethane coating-carbon fiber reinforced composite laminates under erosion was established,and a Vumat subroutine was written.Subsequently,referring to the ASTM D7136 test standard,impact tests with various energy levels were conducted on samples coated with 1 mm and 2 mm polyurethane coatings and uncoated samples.Simultaneously,the proposed damage model was employed to study the formation reasons and propagation patterns of primary damages such as fiber damage,matrix damage,and delamination,thereby revealing the mechanism of polyurethane coating in absorbing impact energy.The results indicated that the mechanical response results calculated by the proposed damage model showed a high degree of agreement with the test results,validating the correctness of the proposed model.Additionally,comparative tests demonstrated the enhancement effect of polyurethane coating on the impact damage resistance of carbon fiber composite laminates.The findings of this study can provide a reference for the design of protective coatings for aircraft.
作者
郭巧荣
曾腾
慕仙莲
赵一志
李顶河
GUO Qiaorong;ZENG Teng;MU Xianlian;ZHAO Yizhi;LI Dinghe(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;Structure Corrosion Protection and Control of Aviation Science and Technology Key Laboratory,China Special Vehicle Research Institute,Jingmen 448035,China;Sino-European Institute of Aviation Engineering,Civil Aviation University of China,Tianjin 300300,China)
出处
《机械强度》
北大核心
2025年第10期148-157,共10页
Journal of Mechanical Strength
基金
航空科学基金项目(20230038067002)。
关键词
复合材料
聚氨酯涂层
预测模型
冲击试验
损伤模式
Composite materials
Polyurethane coating
Predictive model
Impact testing
Damage mode
