Surface treatment method of damage below machining face of carbon-fiber-reinforced composite material

Abstract

The invention relates to a surface treatment method of damage below the machining face of carbon-fiber-reinforced composite material and belongs to the field of composite materials. The treatment method uses micro amount to remove the material layer by layer and includes: sampling; grinding, to be more specific, using a grinding machine to grinding the surface of a sample by using abrasive paper as the medium to expose the damaged surface, wherein the grinding includes coarse grinding, semi-finishing grinding and finishing grinding; cleaning, to be more specific, using an ultrasonic cleaning machine to clean the ground sample so as to remove the impurities on the surface of the material; airing; observing and evaluating. The surface treatment method has the advantages that the method is simple and easy to operate and unlimited by material shape; the surface damage of the obtained sample is clean and complete, and the problem that the damage of the machined observation sample, with the damage below the machining face, of the carbon-fiber-reinforced composite material easily expands to destroy the original shape during machining is solved.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a surface treatment method for under-surface damage observation after carbon fiber reinforced composite materials are processed. Background technique [0002] Most of the carbon fiber reinforced composite parts are laid and solidified at one time and then formed as a whole. In order to meet the assembly requirements, they need to be further processed by cutting holes, cutting edges, etc. However, due to the fact that carbon fiber composites are in a multi-phase state composed of fibers, resins, and interfaces in the microscopic view, they are multi-layered and multi-directional heterogeneous anisotropy in the macroscopic view, and the strength and hardness of the carbon fiber reinforced phase are high, and they are wrapped in The strength of the resin matrix phase and interface phase around the fiber is low, and it is very easy to cause serious mechanical damage such as subsurfac...

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Problems solved by technology

At present, there is no report on the method of preparing damaged samples of carbon fiber reinforced resin matrix composite materials; Wang Hai, Fan Yajun, etc. invented the "Preparation Method of Large-scale Titanium and Titanium Alloy Metallographic Samples", Patent Application No. 201310260852.X, It involves the preparation method of metallographic samples of homogeneous metal materials, but since most of the observed grain sizes are above 30 μm, if the preparation method and parameters are directly used, it is very easy to induce subsurface damage expansion due to excessive removal force, resulting in Sample preparation failed

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