Optimization of Laser Surface Treatment Parameters on ‎Shear Strength of Al/CFRP Adhesively Bonded Lap Joint

Surface treatment preparation plays a key role in the strength of adhesive joints, ‎particularly in single-lap joints. The most optimal surface conditions must be reached to ‎achieve a strong joint. This research aims to achieve the maximum shear strength of single-‎lap Al/composite joints using the laser surface treatment. Four different parameters are ‎considered, namely power, speed, the energy density of the laser on both adherends, and ‎the laser hatch distance (HD). To predict the strength of the connection, the Design of ‎Experiments method has been used. Several single-lap specimens with different surface ‎parameters were created and analyzed experimentally. The results show that the hatch ‎distance had the greatest effect on the shear strength of the specimens, followed by the ‎mutual impact of the Al laser surface treatment power on the HD, the mutual effect of the ‎speed of laser in Al surface treatment on the HD, and the laser power in Al surface ‎treatment and the speed of Al laser surface treatment had the greatest effect on strength. ‎Additionally, it was found that there is no direct or inverse relationship between the speed ‎and laser power parameters. The optimal design obtained has a laser surface treatment ‎speed of ۱۰۰۰ mm/s and ۱۲۰۰ mm/s, and laser power of ۱۸ and ۹ watts for Al and ‎composite, respectively, and ۵۰ micrometers for HD. The obtained optimal specimen has ‎an average shear strength and failure force of ۸.۶ MPa and ۶.۶۷۶ kN, respectively, which ‎shows about ۱۰۲% improvement compared to the sandpaper method.‎

کلیدواژه ها:

Composite ، Optimization ، Adhesive single lap joints ، Laser surface treatment ، Shear strength