碳纤维增强热固性复合材料-钛合金激光连接接头性能分析

doi:10.7527/S1000-6893.2022.25037

Abstract

Abstract: Carbon Fiber Reinforced Thermalsetting (CFRTS) composites and TC4 titanium alloy have high specific strength and rigidity and have obvious lightweight effect, and are widely used in aerospace and new energy automobile manufacturing. To realize high-strength connection between CFRTS and TC4 titanium alloy, this paper introduces an interface compound control process of "laser cleaning+resin filling". To expose the carbon fiber in the CFRTS, a pulsed fiber laser was firstly used to clean the surface of CFRTS, so as to remove the epoxy resin on the surface before laser welding of CFRTS and TC4 titanium alloy. Secondly, a pulsed fiber laser was used to process the surface microtexture of the titanium alloy, so as to increase the contact area between the molten resin and the TC4 titanium alloy during welding and form an "occlusal" structure. Finally, PolyAmide (PA) resin of appropriate thickness was added into the contact surface of the cleaned CFRTS and the titanium alloy for laser-assisted welding. The influence of laser cleaning process on the joint connection strength is studied. A comparative analysis of the CFRTS surface morphology, PA resin filling quality, and joint fracture morphology for different laser cleaning process parameters shows that laser cleaning of CFRTS can significantly enhance the strength of CFRTS-TC4 titanium alloy joint, with the maximum tensile strength reaching 23.77 MPa.

Key words: laser cleaning, laser welding, carbon fiber reinforced thermalsetting composites-titanium alloy heterostructure, connection strength, failure mechanism

CLC Number:

ZOU Qi, YE Yiyun, JIAO Junke, WU Zhisheng, XU Zifa, ZHANG Wenwu. Performance analysis of carbon fiber reinforced thermalsetting composite-titanium alloy laser joint[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(2): 625037-625037.

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Performance analysis of carbon fiber reinforced thermalsetting composite-titanium alloy laser joint

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