Study on multi-layered CFRP patch bonding joint based on laser 3D engraving technology

Zhu Xiaowei; Pan Zhehao; Yang Wenfeng; Li Shaolong; Cao Yu

doi:10.12086/oee.2022.210314

Article navigation > Opto-Electronic Engineering > 2022 Vol. 49 > No. 1 > 210314

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Zhu X W, Pan Z H, Yang W F, et al. Study on multi-layered CFRP patch bonding joint based on laser 3D engraving technology[J]. Opto-Electron Eng, 2022, 49(1): 210314. doi: 10.12086/oee.2022.210314

Citation:

Zhu X W, Pan Z H, Yang W F, et al. Study on multi-layered CFRP patch bonding joint based on laser 3D engraving technology[J]. Opto-Electron Eng, 2022, 49(1): 210314. doi: 10.12086/oee.2022.210314

Study on multi-layered CFRP patch bonding joint based on laser 3D engraving technology

1.
International Science & Technology Cooperation Base for Laser Processing Robot, Wenzhou University, Wenzhou, Zhejiang 325035, China
2.
Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan, Sichuan 618307, China

Fund Project: Zhejiang Provincial Natural Science Funds (LZ20E050003), Sichuan Provincial Science and Technology Plan Projects (2021YFSY0025), and the Wenzhou Science and Technology Projects (ZG2020038, H2020004)

More Information

^*Corresponding author: yucao@wzu.edu.cn

Received Date 26 September 2021

Revised Date 28 December 2021

Published Date 25 January 2022

Abstract

Abstract

To repair structural damage of carbon fiber reinforced polymers (CFRP) for aircrafts, the patch bonding technology is an ideal process to obtain a high-performance CFRP laminate joint. This study proposed a multi-ladder patch bonding adhesive joint design for CFRP laminates. The Yin and Yang film of patch bonding joint was designed and constructed. The code generation algorithms for the layered slice laser 3D engraving and scanning process were explored. The laser ablation processes of CFRP ladder layer interface and the bonding mechanism were investigated, which verified that the tensile strength and impact toughness of the adhesive joint were effectively improved. The failure mode of the joint is consistent with the designed adhesive failure. This study provides a design and fabrication technology to realize high-performance patch bonding joints for CFRP components, which can be applied in aviation, aerospace, and transportation etc.
- patch bonding /
- the mold of yin and yang /
- laser ablation /
- slicing /
- tensile strength

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References

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Overview

Overview

Carbon fiber reinforced polymers (CFRP) are widely used in high-end manufacturing fields such as aircraft skin, high-speed rail body and hull due to their high specific modulus and strength, low thermal expansion coefficient and fatigue resistance. CFRP laminates are made of unidirectional carbon fiber or braided fabric and resin matrix by lamination and hot pressing. The mechanical properties of CFRP laminates have typical anisotropic characteristics. This also places new demands on the maintenance of CFRP parts. The traditional fastener (bolt or rivet) connection repairing has the defect of hole edge layer fracture caused by hole making and mechanical compression force, which greatly affects the failure bearing capacity of the joint. To carry out damage repair of CFRP parts by patch bonding, high structural strength and good aerodynamic profile can be achieved, which is an ideal process to obtain high-performance repairing joints. Previous investigations on surface treatment have established that laser ablation, as an advanced processing method to remove the contamination impurities and change the structure and chemical properties of the surface, is regarded as the best choice for pretreatment of bonding interface. Nevertheless, how to obtain a high-performance patch bonding joint easily and quickly still faces challenges.

In this paper, a "6+2" axis general-purpose robot laser processing system is built for process validation and the design strategy for multi-ladder patch bonding joints of CFRP laminates is proposed. The construction algorithm of yin and yang molds of patch bonding joints based on automatic slicing of surface profile and the partition splicing laser galvanometer scanning process algorithm are designed. Multi-ladder bonding interface of CFRP parts by laser ablation and the bonding mechanism are investigated by experiments and performance tests. The results of these investigations indicate that surface quality of CFRP parts with laser treatment is good, and the induced surface microstructure greatly increases the roughness and surface area. Furthermore, the carbon fibers in the matrix material have less damage, and the bonding strength is improved. The tensile shear strength and impact toughness of the bonding joints are improved to 16.5 Mpa and 9.4 kJ/m², which are increased by 28% and 15%, respectively, and the failure mode of the joints is cohesive failure. This study provides a design and fabrication technology to realize high-performance patch bonding joints for CFRP components, which can be applied in aviation, aerospace, and transportation etc.ss.