Volume: 2, 2023
2nd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland:
ENVIRONMENT – PLANT – ANIMAL – PRODUCT
Abstract number: T011
DOI: https://doi.org/10.24326/ICDSUPL2.T011
Published online: 19 April 2023
ICDSUPL, 2, T011 (2023)
Metal surface modification for enhance adhesion in fibre metal laminates
Magda Droździel-Jurkiewicz1*, Jarosław Bieniaś1
1 Department of Materials Engineering, Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland
* Corresponding author: m.drozdziel@pollub.pl
Abstract
In recent years fibre metal laminates have gained interest due to their beneficial properties such as impact, fatigue, and corrosion resistance. They consist of alternating metal sheets and fibre-reinforced polymer composites. Laminates are perspective materials, especially for the aerospace industry for parts such as fuselage, wings or aircraft tails. Currently, aluminum, magnesium, and titanium alloys are used for metal layers in laminates. To achieve eligible properties (fatigue, impact, and other mechanical properties) high adhesion between the metal sheet and composite layer is necessary. To improve the adhesion metal surface treatment needs to be carried out, to obtain appropriate physicochemical properties, specific topography, and surface morphology. An anodizing process, including chromic acid anodizing, is commonly used in the aerospace industry providing good bonding and durability. However, it is hazardous for humans and the environment, therefore there is a need to modify and characterize the metal surface in the aspect of obtaining appropriate adhesion at the metal-composite interface. The purpose of the work was the analysis of the metal surface modification on the shear adhesion strength of aluminium-carbon-based fibre metal laminates. Tested fibre metal laminates were made of aluminium alloy 2024-T3 and high-strength carbon epoxy prepreg. A variety of metal surface modifications have been studied including mechanical, chemical, and electrochemical methods as well as the application of transition layers. Specimens were manufactured using the autoclave method. The single-lap tests were conducted according to ASTM D1002. The failure analysis of the surface was carried out using scanning electron microscopy. Based on the conducted research it was noted that the shear strength is correlated to the surface topography and morphology. Three models of fracture were proposed on the basis of shear strength results and surface morphology analysis. It was noted that in fibre metal laminates, etching and chromic acid anodizing favorably enhance the adhesion at the aluminium and carbon composite interface. Simultaneously, a cohesive mode of fracture was noted for those surface modifications. At the same time, the beneficial effect of using intermediate layers in adhesion strength was noted. It was observed that sandblasting and sulphuric acid anodizing result in poor shear strength and is ineffective considering adhesion at the metal-composite interface.
How to cite
M. Droździel-Jurkiewicz, J. Bieniaś, 2023. Metal surface modification for enhance adhesion in fibre metal laminates. In: 2nd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland: Environment – Plant – Animal – Product. https://doi.org/10.24326/ICDSUPL2.T011