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http://dx.doi.org/10.7234/composres.2020.33.6.371

Application of Laser Surface Treatment Technique for Adhesive Bonding of Carbon Fiber Reinforced Composites  

Hwang, Mun-Young (Department of Mechatronics Engineering, and LANL-JBNU Engineering Institute-Korea, Jeonbuk National University)
Kang, Lae-Hyong (Department of Mechatronics Engineering, Department of Flexible and Printable Electronics, and LANL-JBNU Engineering Institute-Korea, Jeonbuk National University)
Huh, Mongyoung (Korea Institute of Carbon Convergence Technology)
Publication Information
Composites Research / v.33, no.6, 2020 , pp. 371-376 More about this Journal
Abstract
The adhesive strength can be improved through surface treatment. The most common method is to improve physical bonding by varying the surface conditions. This study presents the effect of laser surface treatment on the adhesive strength of CFRP. The surface roughness was patterned using a 1064 nm laser. The effects of the number of laser shots and the direction and length of the pattern on the adhesion of the CFRP/CFRP single joint were investigated through tensile tests. Tests according to ASTM D5868 were performed, and the bonding mechanism was determined by analyzing the damaged surface after a fracture. The optimized number of the laser shots and the optimized depth of the roughness should be required to increase the bonding strength on the CFRP surface. When considering the shear stress in the tensile direction, the roughness pattern in the direction of 45° that increases the length of the fracture path in the adhesive layer resulted in an increase of the adhesive strength. The surface treatment of the bonding surface using a laser is a suitable method to acquire a mechanical bonding mechanism and improve the bonding strength of the CFRP bonding joint. The study on the optimized laser process parameters is required for utilizing the benefits of laser surface processing.
Keywords
Adhesion Strength; Carbon Fiber Reinforcement Plastic; Laser; Surface Treatment;
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