| Citation: | HOU R L，WANG C Y，ZHOU P. Tensile properties of rapid repaired CCF300/QY8911 laminates with broken hole damage[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（7）：2172-2183 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0485
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The tensile strength of the CCF300/QY8911 composite laminate after hole damage repair was evaluated using a set of rules and characterization methods. To obtain the necessary data, tensile tests were conducted on standard specimens made from the original material, damaged specimens without repair, and specimens repaired using bonding, riveting, and bonding-riveting joint repair techniques. The corresponding data included strength, stiffness, damage mode, and key point strain. The following conclusions were drawn through comprehensive analysis: the incompatibility between the repair location and the original structure stiffness is the main factor affecting the repair strength; bonding repair has a high connection stiffness, and the main influencing factor of repair strength is the lamina bonding strength;on the other hand, riveting repair, which has a low connection stiffness, is mainly affected by the ease of pulling out the rivet in single shear; bonding-riveting joint repair combines the high stiffness of bonding repair and the dual advantage of riveting repair to prevent interlayer tearing; significantly improving the repair effect by adopting the combined wet assembly process of bonding-riveting, increasing the diameter of rivets, and installing anti-slip pads on the back of the workpiece can achieve a tensile strength of 161.5% and 135.9% higher than the conventional riveting repair and conventional bonding repair, respectively.The method described in this study, which is based on the linear elastic fracture theory, provides a more accurate representation of the real bearing capacity of the restored structure from a comprehensive standpoint.
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