Mechanical shot peening forming and strengthening method of fiber-metal super-hybrid composite laminated sheet

Abstract

The invention discloses a mechanical shot peening forming and strengthening method of a fiber-metal super-hybrid composite laminated sheet. The mechanical shot peening forming and strengthening method comprises the following steps: cutting the fiber-metal super-hybrid composite laminated sheet out with a milling and cutting method; after the cut laminated sheet is fixed in a bonding fixing manner, performing shot peening forming at the coverage rate being 60-100% on a composite material surface by using a shot peening technology of which the shot peening strength is lower than 0.25A; controlling the shot peening surface of the composite material surface to obtain compressive stress lower than 200MPa; performing damage detection and analysis and curvature detection and analysis by ultrasonic wave C scanning and a test device; and finally performing profiling. The mechanical shot peening forming and strengthening method disclosed by the invention is the only flexible non-mold forming method provided in accordance with a fiber-metal super-hybrid composite material at present, and is low in cost and high in flexibility; an effective solution is provided for the forming of double-curvature members and multi-curvature members of the type of the composite material, and the static strength and the fatigue performance of the material are obviously improved; and urgent requirements for large-sized complex members of the type of the composite materials in aerospace industry can be met by the mechanical shot peening forming and strengthening method, and a good thought for the plasticity forming of other lamellar composite materials is provided.

Description

Technical field [0001] The invention belongs to the technical field of forming advanced composite materials, and particularly relates to a mechanical shot peening forming and strengthening method for a fiber-metal super-hybrid composite laminate. Background technique [0002] Fiber-metal super-hybrid composite material is an inter-layer hybrid composite material formed by alternately laying metal sheets and fiber composite materials and curing them at a certain temperature and pressure. It combines the characteristics of traditional fiber composite materials and metal materials, has high specific strength and specific stiffness, excellent fatigue performance and high damage tolerance. These advantages have made this type of material have been widely used in the aerospace industry , And has great application potential in rail transit, automobiles and other industrial fields. [0003] The forming of fiber-metal super-hybrid composite materials generally has two ideas, that is, formi...

AI Technical Summary

Problems solved by technology

However, self-forming can only produce single-curvature components with small curvatures, and cannot form more complex double-curvature or multi-curvature components; at the same time, this process needs to be formed while the material is solidified in an autoclave, and its forming flexibility Small, high mold cost

Not only that, the springback problem of the self-forming process is significant, and repeated empirical repairs are required, which increases the cost of mold manufacturing

Chinese patent CN201410056071.3 discloses an invention patent named "Preparation and Forming Method of Glare Components", but this patent cannot be prepared in an autoclave, and the obtained fiber-metal hyperhybrid composite material will have significant defects and cannot Meet manufacturing requirements for aerospace components

Secondly, the metal layer and fiber layer of the fiber-metal hyperhybrid composite material are only 0.2mm-0.5mm. The shot peening method and process of the existing metal material will directly cause fiber damage and interface failure, which cannot meet its forming requirements.

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