Low‐velocity impact performance of notched glass fiber reinforced plastic composites repaired by bonding external composite patches was investigated by experimental and numerical methods. Various patches of different fiber materials such as carbon and glass fiber and thickness were considered under different impact energy levels. The continuum damage mechanics based on a dynamic progressive damage model was using to build the finite element model and cohesive elements were used between the composite patch and notched composite plate. Five different failure criteria based on three‐dimensional Hashin damage models were implemented by the explicit finite element subroutine ABAQUS‐VUMAT with degradation model and used to compare experimental damage areas. The experimental contact force, kinetic energy histories, and experimental damage areas were calculated and compared the numerical ones. While the experimental data confirm the efficiency of the proposed model, they show consistent results with the numerical model. Finally, using the composite patch is succeeded to avoid impact damage. This research provides fundamental support for the appropriate selection of external composite patch type and use of the degradation model with different failure model to achieve high‐efficiency simulation under impact loading.

中文翻译：

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不同复合材料修补物对缺口GFRP复合材料低速冲击性能的研究：实验和建模

通过实验和数值方法研究了通过粘结外部复合材料补片修复的缺口玻璃纤维增​​强塑料复合材料的低速冲击性能。在不同的冲击能级下，考虑了不同纤维材料（例如碳纤维和玻璃纤维）的各种补丁和厚度。使用基于动态渐进损伤模型的连续损伤力学建立有限元模型，并在复合贴片和带槽复合板之间使用内聚单元。显式的有限元子程序ABAQUS-VUMAT和退化模型实现了基于三维Hashin损伤模型的五种不同的失效准则，并用于比较实验损伤区域。实验接触力，动能历史，计算了实验损伤区域并与数值区域进行了比较。虽然实验数据证实了所提出模型的有效性，但它们与数值模型显示出一致的结果。最后，成功地使用了复合贴剂，避免了冲击破坏。这项研究提供了外部复合贴片式，并使用不同的失效模型冲击载荷作用下，实现高效率的模拟退化模型的适当选择基本面支撑。