Three-dimensional nondestructive testing method for impact damage of composite laminated board

Abstract

The invention relates to a three-dimensional nondestructive testing method for impact damage of a composite laminated board. The three-dimensional nondestructive testing method comprises the steps of1) determining a maximum damage area in an impacted composite material through ultrasonic C scanning; 2) scanning the maximum damage area obtained in the step 1) by using an X-ray computed tomographytechnology; 3) performing three-dimensional reconstruction on the scanning result in the step 2), and distinguishing different components (including materials and damage) of the impacted composite material according to the gray value; and 4) according to the impact surface image of the impacted composite material, obtaining the layered distribution of the impacted composite material by using a characteristic surface method. Compared with the prior art, the method has the advantages of being high in detection accuracy, capable of obtaining nondestructive three-dimensional damage results and thelike.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a three-dimensional non-destructive testing method for impact damage of composite material laminates. Background technique [0002] Continuous carbon fiber-reinforced resin-based composites are more and more widely used in the aviation field. The material is generally composed of multi-layer anisotropic unidirectional tapes, which are laminated by hot pressing according to the preset lay-up sequence. Delamination is therefore a noteworthy form of damage that differentiates this material from homogeneous materials. In addition, delamination often causes fatal damage to composite laminates, which greatly reduces the strength of the laminate. [0003] The damage of composite materials can be divided into two categories from the perspective of identification: 1. Visible damage, such damage is generally deep pits, fiber pull-out, material fracture, etc., which are eas...

AI Technical Summary

Problems solved by technology

2. Invisible damage, such damage occurs inside the material, such as delamination, matrix cracks, etc., requiring special detection methods

In addition, in terms of damage identification of different materials, the results of two-dimensional damage detection are insufficient. For example, after different materials are subjected to the same impact load, the degree of internal damage may vary greatly, but the two-dimensional maximum damage area is not different. Large, which may lead to a wrong judgment on the impact resistance of the material

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