Cold extrusion strengthening method for assembling hole of CFRP composite material laminate

Abstract

The invention provides a cold extrusion strengthening method for an assembling hole of a CFRP composite material laminate. The method comprises the following steps: (a) providing a bush, wherein the bush can be assembled in the assembling hole; (b) providing a metal core rod with the taper, and inserting the core rod into the bush; (c) arranging the bush in the assembling hole; (d) applying axial force to the core rod by virtue of extrusion equipment, so that the bush is extruded by the part, with the largest diameter, of the core rod; and (e) removing the core rod, so that the bush is fixedly arranged in the assembling hole. Aiming at the assembling hole of the CFRP composite material laminate, the bush is adopted and is matched with a cold extrusion strengthening process, so that the fatigue life of parts can be effectively prolonged, and the service time of an aircraft is prolonged. Because the bush is fastened in the assembling hole, the wear resistance of the connecting structure is improved, and the detachment of assembling fasteners and the maintenance of the parts can be promoted.

Description

technical field [0001] The invention generally relates to composite material surface strengthening technology, in particular to a cold extrusion strengthening method for the assembly hole of CFRP composite laminate. Background technique [0002] Compared with metal materials, composite materials are superior in specific strength, specific stiffness, and corrosion resistance, and their application range as industrial materials is becoming wider and wider. The amount of composite materials has become an important symbol of the advancement of aircraft and even the advancement of the aerospace field. It is the core technology that the world's powers are competing to develop, and it is also a key development area for our country. [0003] Carbon fiber reinforced resin matrix composite (CFRP: Carbon Fiber Reinforced Plastic) laminate is a composite material cured by resin matrix and carbon fiber reinforcement together, with high specific strength and specific stiffness, and good c...

AI Technical Summary

Problems solved by technology

However, the holes on the composite member destroy the integrity of the member and are the weak link of stress concentration on the structural parts, which leads to the reduction of the fatigue performance of the CFRP composite member and directly affects the durability design of the aircraft

Although relevant domestic research institutions have conducted extensive and in-depth research on the preparation technology of assembly holes of CFRP composite structural parts, the research work mainly focuses on how to improve the quality and efficiency of hole making. How to carry out assembly holes of CFRP composite laminates Anti-fatigue manufacturing has not attracted widespread attention, and there is still a lack of reports on relevant research results

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