Shear strength of bonded joints of carbon fiber reinforced plastic (CFRP) laminates enhanced by a two-step laser surface treatment
Shear strength of bonded joints of carbon fiber reinforced plastic (CFRP) laminates enhanced by a two-step laser surface treatment
复制标题
通过两步激光表面处理增强碳纤维增强塑料（CFRP）层压板粘合接头的剪切强度
DOI：
10.1016/j.compstruct.2019.111559
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发表时间：
2020
影响因子：
6.3
通讯作者：
Liu Xiaokang
中科院分区：
文献类型：
--
作者：
Xie Yingxi;Yang Binbin;Lu Longsheng;Wan Zhenping;Liu Xiaokang
通过激光表面处理可以提高碳纤维增强塑料（CFRP）单搭接粘合接头的表观剪切强度。在这项工作中，采用两步激光表面处理来提高 CFRP 层压板的单搭接粘合接头性能。 STEP-1，通过最佳的激光蚀刻工艺完全去除层压板外表面的树脂，以提供整齐的碳纤维织物。 STEP-2，将所得的暴露碳纤维织物进一步辐照，在其表面产生一系列微型凹槽。研究了激光扫描参数，即光斑距离、扫描角度、凹槽距离和图案，以分析它们对所生成凹槽形态的影响。还进行了单搭接剪切测试，以评估这些激光加工粘合接头的机械性能。实验结果表明，交叉凹槽显着提高了CFRP层压板的剪切强度。观察剪切试验的破坏形貌，分析激光表面处理沟槽CFRP的强化机理。在激光表面处理过程中采用最佳加工参数，CFRP层合板单搭接粘合接头的表观剪切强度达到18.58MPa，比光滑层合板提高了40.8%。
The apparent shear strength of single-lap bonded joints of carbon fiber reinforced plastic (CFRP) can be enhanced by laser surface treatment. In this work, a two-step laser surface treatment was used to improve the single-lap bonded joint performance of CFRP-laminates. STEP-1, the resin at the outer surface of laminates was completely removed by an optimal laser etching process to provide neat carbon fiber fabric. STEP-2, the as-obtained exposed carbon fiber fabric was further irradiated to produce a series of mini-grooves on its surface. Laser scanning parameters, i.e., spot distance, scanning angles, groove distance and patterns, were investigated to analyze their effects on the morphologies of generated grooves. Single-lap shear tests were also carried out to assess the mechanical performance of these laser processing bonded joints. Experimental results indicated that crossed grooves significantly enhanced the shear strength of the CFRP-laminates. Failure morphologies of shear tests were observed to analyze the strengthening mechanism of grooved-CFRP by laser surface treatment. Using optimal processing parameters during laser surface treatment, the apparent shear strength of single-lap bonded joints of CFRP-laminates reached 18.58 MPa, implying a 40.8% enhancement compared with smooth laminates.