A damage repair method for large-scale holes in complex metal structures

Abstract

The invention relates to a method for repairing damage to a large-sized hole in a complex metal structure. The specific steps are as follows: using a composite material bonding repair process method, using carbon fiber woven cloth to bond the area to be repaired through J-349-1 structural glue; The reverse engineering software platform obtains the outline of the area to be repaired, and on this basis designs and manufactures the aluminum alloy box section and makes holes; installs the aluminum alloy box section after the hole is fixed on the cured glued repair area; mechanically connects After the repair is completed, check the quality of the repair and restore the surface paint. The present invention solves the complex structure of certain parts of the aircraft life-saving system that has a large curvature surface and cannot be disassembled due to integral manufacturing by adopting a method for repairing the mechanical connection and repair of the metal reinforcement box section by adopting a new type of composite material wet method infiltration and bonding. Due to the narrow space in the repair reinforcement area and the partition frame is composed of plane and curved surfaces, the curved surfaces with large curvature cannot be mechanically connected, resulting in the problem that large-sized damaged holes cannot be repaired.

Description

technical field [0001] The invention relates to the technical field of damage repair of complex metal structures of aircraft, in particular to a method for repairing damage of large-sized holes in complex metal structures. Background technique [0002] When the aircraft suffers bullet wounds, burns or other accidental damages, resulting in severe skin deformation, cracks, internal structure damage or even large-sized holes, equal-strength mechanical connection repairs are often used to solve the problem. Mechanical connection repair is to connect the reinforced box section with the damaged part through the mechanical engagement of bolts, rivets and other connecting parts to effectively transmit the force. The main advantages are as follows: the quality of the joint is stable and reliable, and it is less affected by environmental aging; the operation Simple, low requirement for personnel operation skills. However, in view of the complexity of the aircraft structure and the d...

AI Technical Summary

Problems solved by technology

However, in view of the complexity of the aircraft structure and the diversification of the use of airframe materials, the traditional riveting repair has limitations

[0003] Composite material adhesive repair has the advantages of small structural weight gain, good fatigue resistance and corrosion resistance, strong designability, short repair time, and is suitable for quick repair in the field. It has been widely used in aircraft repair. Composite material adhesive repair The main function is to effectively reduce the stress intensity factor of repair cracks and restore the remaining strength to an acceptable level. However, direct repair of this repair method for large-scale hole damage in aircraft structures obviously cannot meet the repair requirements.

Images