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Laser-induced groove optimization for Al/CFRP adhesive joint strength
International Journal of Adhesion and Adhesives ( IF 3.4 ) Pub Date : 2021-02-22 , DOI: 10.1016/j.ijadhadh.2021.102830
Erhan Akman , Mustafa Özgür Bora , Onur Çoban , Belgin Genc Oztoprak

The ability to achieve sufficient values of adhesive strength depends on many parameters such as type and thickness of the adhesive, and especially appropriate surface preparation. While it is possible to increase the adhesive strength of a surface prepared for bonding by making it chemically suitable, forming of the structures that will provide mechanical interlocking can also increase the adhesive shear strength. Mechanical interlocking groove parameters such as depth, width, and number per unit area formed on the AA2024-T3 aluminum surface by using fiber laser were optimized for adhesive bonding strength with carbon fiber reinforced polymer (CFRP). The top surface and cross-sectional images were used to determine the geometrical change of the grooves produced on the aluminum surface. As the depth of the grooves increased, the adhesion surface area of the samples increased by approximately 308%. According to the single-lap shear strength test results, the increase in the depth of the grooves, hence the adhesion surface area and the entrance width of the grooves have a common effect on the shear strength. While increase in the adhesive surface area and entrance width of the grooves increases the shear strength, decreasing in the entrance width causes the decrease in the shear strength even if the surface area increases. In this study, with the effect of mechanical interlocking caused by laser-induced grooves, approximately 180% increase in adhesive shear strength (26.48 MPa) was achieved compared to the abraded sample. After mechanical tests, failure modes were also observed by using the a photo camera. It was determined that the effect of created grooves with optimized geometrical sizes on the AA2024-T3 aluminum surfaces changed the failure mode that occurred at the CFRP surfaces from adhesive failure to fiber tear failure.



中文翻译:

激光诱导沟槽优化Al / CFRP粘接强度

获得足够的粘合强度值的能力取决于许多参数,例如粘合剂的类型和厚度,尤其是适当的表面处理。尽管可以通过使其在化学上合适而增加为粘合准备的表面的粘合强度,但是形成将提供机械互锁的结构也可以提高粘合剪切强度。优化了机械互锁凹槽参数,例如通过使用光纤激光器在A2022-T3铝表面上形成的深度,宽度和每单位面积的数量,以提高与碳纤维增强聚合物(CFRP)的粘合强度。顶表面和横截面图像用于确定在铝表面上产生的凹槽的几何变化。随着凹槽深度的增加,样品的粘附表面积增加了约308%。根据单圈剪切强度测试结果,凹槽深度增加,因此凹槽的粘附表面积和入口宽度对剪切强度具有共同的影响。尽管粘合剂表面积的增加和凹槽的入口宽度的增加会提高剪切强度,但是入口宽度的减小会导致剪切强度的降低,即使表面积增加也是如此。在这项研究中,受激光诱导的凹槽引起的机械互锁的影响,与磨耗的样品相比,粘合剪切强度(26.48 MPa)提高了约180%。在机械测试后,还通过使用摄像头观察了故障模式。

更新日期:2021-02-28
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