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Pulsed laser texturing for improved adhesive-bonded polyethylene (PE) joints
International Journal of Adhesion and Adhesives ( IF 3.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ijadhadh.2020.102676
Adrian H.A. Lutey , Fabrizio Moroni

Abstract Nanosecond pulsed laser texturing was performed on pigmented polyethylene (PE) specimens with a 1064 nm fiber laser with the aim of improving adhesive-bonded joint strength. A Design-of-Experiments (DoE) was employed to optimize process parameters and determine the effects of average laser power, scanning velocity and hatch spacing on the resulting failure load of PE joints bonded with Teroson 9399. Failure load increased with laser energy dose up to the onset of macroscopic melting. Laser scanning strategies minimizing heat accumulation yielded best results as the energy dose could be increased as much as possible prior to onset of melting. The process exhibited highest sensitivity to heat accumulation in the laser scanning direction, favoring large pulse separation distances in the scanning direction and moderate pulse overlap in the lateral direction. With a focused spot diameter of 60 μm and a repetition rate of 20 kHz, a maximum failure load of 0.93 kN (1.49 MPa, standard deviation 0.01 kN) was achieved with a crossing-line laser scanning strategy, 25 μm hatch spacing, 3 W average power and 2500 mm/s scanning velocity. Under these conditions, purely cohesive failure took place yielding a 79% improvement in failure load over standard primed joints.

中文翻译:

用于改进粘合剂粘合聚乙烯 (PE) 接头的脉冲激光纹理

摘要 使用 1064 nm 光纤激光器对着色聚乙烯 (PE) 试样进行纳秒脉冲激光纹理化,以提高胶接接头强度。采用实验设计 (DoE) 来优化工艺参数并确定平均激光功率、扫描速度和舱口间距对与 Teroson 9399 粘合的 PE 接头产生的失效载荷的影响。失效载荷随着激光能量剂量的增加而增加到宏观熔化的开始。激光扫描策略最大限度地减少热量积累产生了最好的结果,因为可以在熔化开始之前尽可能地增加能量剂量。该过程对激光扫描方向上的热量积累表现出最高的敏感性,有利于在扫描方向上大的脉冲间隔距离和在横向上适度的脉冲重叠。聚焦光斑直径为 60 μm,重复频率为 20 kHz,通过交叉线激光扫描策略、25 μm 孵化间距、3 W 实现了 0.93 kN(1.49 MPa,标准偏差 0.01 kN)的最大失效载荷平均功率和 2500 毫米/秒的扫描速度。在这些条件下,发生了纯粹的内聚破坏,与标准底漆接头相比,破坏载荷提高了 79%。
更新日期:2020-10-01
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