Wei Xiaojun, Huang Mingxuan, Cai Chaocan, Xu Zhonghai, Peng Qingyu
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China.
Suzhou Research Institute of HlT, Suzhou 215104, China.
Polymers (Basel). 2025 Mar 30;17(7):942. doi: 10.3390/polym17070942.
The widespread use of composite materials has led to an increased focus on restoring the mechanical properties of damaged composite structures to ensure system safety. This study combines compression experiments and finite element simulations to investigate the effectiveness of different patch sizes and repair methods, including single- and double-sided repairs, in restoring the structural strength of composite laminates with barely visible impact damage (BVID). The results demonstrate that low-velocity impact significantly affects the strength of the laminate, reducing it to 68.53% of its original strength, highlighting the necessity of patch repair. For composite specimens repaired using patching, an increase in the patch radius consistently enhances strength recovery, reaching up to 93.96% of the original strength. However, this also leads to an increase in weight, suggesting that the patch radius should be selected based on the specific requirements of the application. Furthermore, double-sided patching is preferable to single-sided patching. This approach improves the repair efficiency by 4.96%, primarily due to its ability to provide a more uniform stress distribution. Consequently, the risk of premature buckling and failure under compressive loading is significantly reduced, ensuring improved structural integrity and durability. The finite element simulation results presented in this study align well with the experimental findings, with a maximum error of no more than 10.68%. In conclusion, this work provides reliable guidance for the optimal patch repair of composite structures and lays a solid foundation for the practical application of patch repairs in engineering.
复合材料的广泛应用使得人们更加关注恢复受损复合材料结构的力学性能以确保系统安全。本研究结合压缩实验和有限元模拟，研究不同补片尺寸和修复方法（包括单面和双面修复）对恢复具有轻微可见冲击损伤（BVID）的复合材料层压板结构强度的有效性。结果表明，低速冲击显著影响层压板的强度，使其降至原始强度的68.53%，凸显了补片修复的必要性。对于采用补片修复的复合材料试样，补片半径的增加持续提高强度恢复率，最高可达原始强度的93.96%。然而，这也导致重量增加，表明应根据具体应用要求选择补片半径。此外，双面补片优于单面补片。这种方法将修复效率提高了4.96%，主要是因为它能够提供更均匀的应力分布。因此，在压缩载荷下过早屈曲和失效的风险显著降低，确保了结构完整性和耐久性的提高。本研究中给出的有限元模拟结果与实验结果吻合良好，最大误差不超过10.68%。总之，这项工作为复合材料结构的最佳补片修复提供了可靠的指导，并为补片修复在工程中的实际应用奠定了坚实的基础。
