Quantitative evaluation method for drilling defects of carbon fiber composite materials

Abstract

A quantitative evaluation method for drilling defects of carbon fiber composite materials, by introducing two-dimensional area factors in the evaluation of tearing defects and burr defects as well asthe defect area calculation technology based on color recognition, obtains (1) a three-dimensional layering factor, that is the ratio of the volume of layered defects to the volume of the nominal drilling, as a layered defect; (2) a two-dimensional defect factor, that is, the ratio of the defect area to the nominal hole area, as an exit tear defect; and (3) the fiber pull-out at the surface of thedrill bit as an exit burr defect. When the quantitative evaluation index obtained by weighting is 0.6 to 1, the tested carbon fiber composite material is a defective product. The invention overcomesthe lack of evaluation factors in the existing carbon fiber composite material drilling processing quality evaluation standards, and improves the accuracy of quantitative evaluation results.

Description

technical field [0001] The invention relates to a technology in the field of mechanical processing, in particular to a comprehensive defect evaluation method based on color area recognition for three typical defects of carbon fiber composite materials - delamination, tearing and burrs. Background technique [0002] Carbon fiber reinforced composite material is a kind of high-strength and light-weight material widely used in aerospace equipment. Since the connection of components is mainly carried out by bolts and rivets, a large number of hole processing is required. However, due to the difference in the properties of the two-phase materials of carbon fiber composite materials, processing defects are easily generated during the hole making process, which are mainly divided into three types: delamination defects, exit tear defects and exit burr defects. At present, the inspection and evaluation standards for the processing quality of composite materials do not consider the c...

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Problems solved by technology

[0003] The present invention aims at the evaluation of the burr defect and the tear defect in the composite material hole-making process by the existing defect detection means, using the ratio of the maximum diameter of the burr defect or the tear defect range to the nominal diameter of the hole as the evaluation factor, resulting in the evaluation result In order to solve the defects of deviation, a quantitative evaluation method for drilling defects in carbon fiber composite materials is proposed. By introducing the two-dimensional area factor in the evaluation of tear defects and burr defects and the defect area calculation technology based on color recognition, the existing carbon fiber composite material drilling defects can be overcome. The lack of evaluation factors in the hole processing quality evaluation standard improves the accuracy of quantitative evaluation results

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