Test method for machining defect analysis of CFRP unidirectional laminates

Abstract

The invention discloses a test method for machining defect analysis of CFRP unidirectional laminates. The test method is characterized by adopting multiple specimens made of carbon fiber prepreg cloth and having different fiber orientation angles to carry out an orthogonal fly cutting test, then carrying out photographic observation to material fractures of the cut specimens through a scanning electron microscope and obtaining image data, and thus providing an experimental data base for research of a CFRP cutting removal mechanism. According to the invention, material surface morphology change rules of CFRP in a cutting-off process are researched by using a single-point fly cutting method, cutting laws of carbon fibers under different fiber orientation angles are mainly concerned, a fracture formation mechanism of carbon fiber cutting is explained from two aspects of macroscopic and microscopic morphology, and based on the fracture formation mechanism, a formation mechanism of entrance and exit defects of the CFRP unidirectional laminates under different fiber directions is obtained, so that an experimental and theoretical basis is provided for reducing machining defects in a cutting process of CFRP materials to avoid component machining quality accidents caused by the machining defects.

Description

technical field [0001] The invention relates to the analysis of the cutting processing quality of carbon fiber reinforced composite materials, in particular to a test method for analyzing the processing defects of CFRP unidirectional laminated plates, belonging to the technical field of mechanical cutting. Background technique [0002] With the rapid development of the global aviation industry, whether it is a military aircraft that emphasizes flight performance, or a civilian aircraft that emphasizes safety, economy, environmental protection, and comfort, lighter and stronger aircraft structures made of composite materials have become the general trend. In the past few decades, Carbon Fiber Reinforced Polymer (CFRP) has rapidly developed into the mainstream material of aerospace structural parts. The cutting process of CFRP materials is obviously different from that of traditional single-phase metal materials, which is mainly caused by the significant anisotropy of CFRP mat...

AI Technical Summary

Problems solved by technology

The CFRP material is composed of a reinforcement phase material and a matrix phase material. The reinforcement phase material is hard and brittle and difficult to process. Its cutting process is generally brittle fracture after being squeezed by the tool, so it is easy to cause severe load and severe wear of the tool; the matrix The phase material has the characteristics of soft plastic and difficult to process, and there is a large plastic deformation process in the separation process of the material during the cutting process, especially under the influence of cutting temperature, it is easy to lose the original strength and hardness of the matrix material, and make the reinforced phase material The material loses its due protection and support, resulting in delamination, burrs, tearing, etc., resulting in various processing defects

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