Mechanics of Advanced Composite Structures

Mechanics of Advanced Composite Structures

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

Document Type : Research Article

Authors
Department of Mechanical Engineering, University of Birjand, Birjand, Iran
Abstract
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 1000 mm/s and 1200 mm/s, and laser power of 18 and 9 watts for Al and ‎composite, respectively, and 50 micrometers for HD. The obtained optimal specimen has ‎an average shear strength and failure force of 8.6 MPa and 6.676 kN, respectively, which ‎shows about 102% improvement compared to the sandpaper method.‎
Keywords
Subjects

‎[1]‎    Samarghandi, M, Rahnama, S., and Sheikhi ‎Azqandi, M., 2024. Designing and ‎manufacturing carbon fiber reinforced ‎composites to achieve desired mechanical ‎properties for adhesive joints. In 9th ‎International Conference of Manufacturing ‎Engineering. Tehran, Iran.‎
‎[2]‎    Zhan, X., Li, Y., Gao, C., Wang, H. and Yang, Y., ‎‎2018. Effect of infrared laser surface ‎treatment on the microstructure and ‎properties of adhesively CFRP bonded joints. ‎Optics and Laser Technology, 106, pp. 398-‎‎409.‎
‎[3]‎    Kariman Moghaddam, A. and Rahnama, S., ‎‎2023. Experimental investigation of the effect ‎of the functional pattern of laser surface ‎treatment on the strength of ‎aluminum/composite adhesive bonded joint ‎in the mode I fracture. Modares Mechanical ‎Engineering, 23, pp. 485-495.‎
‎[4]‎    Chuanmin, Z., Hailang, W., Junying, M., Yu, M., ‎Jianping, L., Carlson, B. and Maddela, S., 2019. ‎Application of pulsed Yb-fiber laser to surface ‎treatment of Al alloys for improved adhesive ‎bonded performance. Optics and Lasers in ‎Engineering, 119, pp. 65-76.‎
‎[5]‎    Mu., W., Qin, G., Na, J., Tan, W., Liu, H. and ‎Luan, J., 2019. Effect of alternating load on the ‎residual strength of environmentally aged ‎adhesively bonded CFRP-aluminum alloy ‎joints. Composites Part B: Engineering, 168, ‎pp. 87-97.‎
‎[6]‎    Yousefi, M., Rahnama, S. and Farhadi Nia, M., ‎‎2020. Experimental investigation on the ‎mechanical behavior of hybrid bonded ‎‎(rivet/adhesive) tubular lap joint (composite ‎to metal) under pure torsion. Internatinal ‎Journal of Adhesion Science and Technology, ‎‎34, pp. 2510-2521.‎
‎[7]‎    Feng, Z., Zhao, H., Tan, C., Zhu, B., Xia, F., ‎Wang, Q., Chen, B. and Song, X., 2019. Effect ‎of laser texturing on the surface ‎characteristics and bonding property of ‎‎30CrMnSiA steel adhesive joints. Journal of ‎Manufacturing Processes, 47, pp. 219-228.‎
‎[8]‎    Mu, W., Na, J., Tan, W., Wang, G., Shen, H. and ‎Li, X., 2020. Durability of adhesively bonded ‎CFRP-aluminum alloy joints subjected to ‎coupled temperature and alternating load. ‎Internatinal Journal of Adhesion and ‎Adhesives, 99, pp. 102583.‎
‎[9]‎    Dadian, A., Rahnama, S. and Zolfaghari, A., ‎‎2020. Experimental study of the CTBN effect ‎on mechanical properties and mode I and II ‎fracture toughness of a new epoxy resin. ‎Internatinal Journal of Adhesion Science and ‎Technology, 34, pp. 2389-2404.‎
‎[10]‎    Yousefi, M., Rahnama, S. and Farhadi Nia, M., ‎‎2022. Theoretical and experimental ‎investigation on mechanical behavior of ‎aluminum to aluminum tubular bonded lap ‎joint under pure torsion and a finite element ‎comparison with hybrid rivet/bonded joint. ‎Journal of Applied and Computational ‎Mechanics, 8, pp. 485-492.‎
‎[11]‎    Alfano, M., Lubineau, G., Furgiuele, F. and ‎Paulino, GH., 2012. Study on the role of laser ‎surface irradiation on damage and ‎decohesion of Al/epoxy joints. Internatinal ‎Journal of Adhesion and Adhesives, 39, pp. ‎‎33-41.‎
‎[12]‎    Li, Y., Meng, S. and Gong, Q., 2019. ‎Experimental and theoretical investigation of ‎laser pretreatment on strengthening the ‎heterojunction between carbon fiber-‎reinforced plastic and aluminum alloy. ACS ‎Applied Materials & Interfaces, 11, pp. ‎‎22005-22014.‎
‎[13]‎    Park, SY. and Choi, WJ., 2019. Investigation on ‎the effectiveness of silane-based field level ‎surface treatments of aluminum substrates ‎for on-aircraft bonded repairs. Internatinal ‎Journal of Adhesion and Adhesives, 95, pp. ‎‎102414.‎
‎[14]‎    Park, SY., Choi, W.J. and Choi, H.S., 2018. A ‎review of the recent developments in surface ‎treatment techniques for bonded repair of ‎aluminum airframe structures. International ‎Journal of Adhesion and Adhesives, 80, pp. ‎‎16-29.‎
‎[15]‎    Wang, H., Hao, X., Zhou, H., Li, D. and Hau, L., ‎‎2016. Study on ultrasonic vibration-assisted ‎adhesive bonding of CFRP joints. Internatinal ‎Journal of Adhesion Science and Technology, ‎‎30, pp. 1842-1857.‎
‎[16]‎    Liu, Y., Pan, L. and Hu, X., 2017. Effect of peel ‎plies on bonding properties of T300/Cycom ‎‎970 epoxy composites. Acta Materiae ‎Compositae Sinica, 34, pp. 996-1002.‎
‎[17]‎    Stammen, E., Dilger, K., Böhm, S. and Hose, ‎R., 2007. Surface modification with laser: ‎pretreatment of aluminium alloys for ‎adhesive bonding. Plasma Processes and ‎Polymers, 4(S1), pp. S39-S43.‎
‎[18]‎    Rechner, R., Jansen, I. and Beyer, E., 2010. ‎Influence on the strength and aging resistance ‎of aluminium joints by laser pre-treatment ‎and surface modification. International ‎Journal of Adhesion and Adhesives, 30, pp. ‎‎595-601.‎
‎[19]‎    Sheikhi Azqandi, M., 2021. A novel hybrid ‎genetic modified colliding bodies ‎optimization for designing of composite ‎laminates. Mechanics of Advanced Composite ‎Structures, 8(1), pp. 203-212. ‎Doi:10.22075/macs.2020.20281.1254.‎
‎[20]‎    Belcher, M., Wohl, C. and Hopkins, J., 2010. ‎Laser surface preparation for adhesive ‎bonding of aerospace structural composites. ‎In 14th European Conference of Composite ‎Materials.‎
‎[21]‎    Yang, G., Yang, T. and Yuan, W., 2019. The ‎influence of surface treatment on the tensile ‎properties of carbon fiber-reinforced epoxy ‎composites-bonded joints. Composites Part ‎B: Engineering, 160, pp. 446-456.‎
‎[22]‎    Bora, MO., Coban, O. and Akman, E., 2020. ‎Comparison of novel surface treatments of Al ‎‎2024 alloy for al/cfrp adhesive bonded joints. ‎International Journal of Adhesion and ‎Adhesives, 103, pp. 102721.‎
‎[23]‎    Gude, M., Prolongo, S. and Urena, A., 2012. ‎Adhesive bonding of carbon fibre/epoxy ‎laminates: correlation between surface and ‎mechanical properties. Surface and Coatings ‎Technology, 207, pp. 602-607.‎
‎[24]‎    Sun, C., Min, J. and Lin, J., 2018. The effect of ‎laser ablation treatment on the chemistry, ‎morphology and bonding strength of CFRP ‎joints. International Journal of Adhesion and ‎Adhesives, 84, pp. 325-334.‎
‎[25]‎    Dadian A, Rahnama, S. and Zolfaghari, A., ‎‎2019. Strength improvement of composite-‎steel lap joint by grading the joint area with ‎carbon and glass fiber and also mechanical ‎interference by reverse step. Journal of ‎Science and Technology of Composites, 6, ‎pp. 393-400.‎
‎[26]‎    Dadian, A. and Rahnama, S., 2021. ‎Experimental and numerical study of ‎optimum functionally graded ‎aluminum/GFRP adhesive lap shear joints ‎using epoxy/CTBN. International Journal of ‎Adhesion and Adhesives, 107, p. 102854.‎
‎[27]‎    Li, H., Liu, H, Li, S. and Qin, X., 2022. ‎Influence of high pulse fluence infrared laser ‎surface pretreatment parameters on the ‎mechanical properties of CFRP/aluminium ‎alloy adhesive joints. The Journal of ‎Adhesion, 99(4), pp. 584-605.‎
‎[28]‎    Zou, X., Liu, L., Chen, T., Wu, L., Chen, K., ‎Kong, L. and Wang, M., 2023. Laser surface ‎treatment to enhance the adhesive bonding ‎between steel and CFRP: effect of laser spot ‎overlapping and pulse fluence. Optics & Laser ‎Technology, 159, p. 109002.‎
‎[29]‎    Kariman Moghaddam, A. and Rahnama, S., ‎‎2023. The experimental investigation of the ‎effects of laser surface treatment on the ‎fracture behavior of CFRP/Al adhesive joints. ‎Journal of Science and Technology of ‎Composites, 9(4), pp. 2116-2127.‎
‎[30]‎    Guo, Y., Zhao, H., Ai, C., Zhao, J., Su, H., Chen, J. ‎and Zhao, G., 2024. Parameter optimization of ‎friction stir spot welded Al 6061 and CFRTP ‎PA6 with surface treatment and interfacial ‎adhesion. Thin-Walled Structures, 197, pp. ‎‎111585.‎
‎[31]‎    Liu, Y.,, Wang, X., Zhou, L., Zhao, H., Han, X., ‎Tan, C. and Song, X., 2024. Achievement of ‎high-strength Al/CFRP hybrid joint via high-‎speed friction stir lap joining and laser ‎texturing pretreatment parameters variation. ‎Thin-Walled Structures, 199, pp. 111762.‎
‎[32]‎    Wang, F., Yu, Y., Fu, R., Si, L., Wang, Q., Luo, C. ‎and Wang, Z., 2024. Influence of laser ‎texturing on the properties of fusion joints ‎between aluminum alloys and carbon fiber ‎reinforced thermoplastic composites. Journal ‎of Thermoplastic Composite Materials, 38(4), ‎pp. 1576-1597.‎
‎[33]‎    ASTM International, 2018. Standard test ‎method for ignition loss of cured reinforced ‎resins. ASTM D2584. Philadelphia, PA: ASTM ‎International.‎
‎[34]‎    ASTM International, 2005. Standard practice ‎for classifying failure modes in fiber-‎reinforced-plastic (FRP) joints. ASTM D5573.‎
‎[35]‎    ASTM International, 2000. Standard test ‎method for tensile properties of polymer ‎matrix composite materials. ASTM D3039. ‎West Conshohocken, PA: ASTM International.‎
‎[36]‎    Karash, ETB. and Kassim, MTE., 2023. The ‎microstructure and mechanical properties of ‎the aluminum alloy (AA 6061 T6) under the ‎effect of friction stir processing. In: Recent ‎Advancements in Aluminum Alloys. ‎IntechOpen.‎