Abstract
Laser surface treatment of metals is one option to improve their properties for adhesive bonding. In this paper, a pulsed YVO4 Laser source with a wavelength of 1064 nm and a maximum power of 25 W was utilized to increase the surface area of the steel HCT490X in order to improve its bonding properties with a carbon fibre reinforced polymer (CFRP). Investigated was the influence of the scanning speed of the laser source on the bonding properties. For this purpose, the steel surfaces were ablated at a scanning speed between 1500 and 4500 mm/s. Afterwards the components were bonded with the adhesive HexBond™ 677. After lap shear tests were carried out on the specimen, the surfaces were inspected using scanning electron microscopy (SEM). The experiments revealed that the bonding quality can be improved with a high scanning speed, even when the surface is not completely ablated.
Highlights
To minimize the energy consumption and C O2 emissions of vehicles, mass reduction is an omnipresent objective in the automotive industry
A promising approach to reducing mass while simultaneously ensuring the required safety relevant strength properties is the use of hybrid materials like fibre-metal laminates (FML) or steel structures partially reinforced with carbon fibre reinforced polymers (CFRP) in modern car structures
Hybrid structures are manufactured by adhesive bonding, which offers several advantages over mechanical joining, such as even force transmission compared to riveted or screwed hybrid structures with stress concentrations at the joining points [3]
Summary
To minimize the energy consumption and C O2 emissions of vehicles, mass reduction is an omnipresent objective in the automotive industry. A promising approach to reducing mass while simultaneously ensuring the required safety relevant strength properties is the use of hybrid materials like fibre-metal laminates (FML) or steel structures partially reinforced with carbon fibre reinforced polymers (CFRP) in modern car structures. This is made possible by combining the best features of metals and fibre-reinforced matrix materials, e.g. the impact resistance of metals with the high stiffness and lightweight properties of compound materials [1, 2]. The joining of dissimilar materials can lead to contact corrosion.
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