Reference : PROCESS INNOVATION FOR SENSORS IN MOBILE APPLICATIONS BASED ON LASER ASSISTED METAL-P...
Dissertations and theses : Doctoral thesis
Engineering, computing & technology : Materials science & engineering
Physics and Materials Science
http://hdl.handle.net/10993/48517
PROCESS INNOVATION FOR SENSORS IN MOBILE APPLICATIONS BASED ON LASER ASSISTED METAL-POLYMER JOINING
English
Amne Elahi, Mahdi mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) >]
27-Oct-2021
University of Luxembourg, ​Luxembourg, ​​Luxembourg
DOCTEUR DE L’UNIVERSITÉ DU LUXEMBOURG EN SCIENCES DE L’INGÉNIEUR
103
Plapper, Peter mailto
Kedziora, Slawomir mailto
Reisgen, Uwe
Mücklich, Frank
Houssiau, Laurent
[en] laser joining of aluminum-polyamide ; surface pre-treatment ; laser polishing ; tensile-shear test ; failure mechanism
[en] The laser joining of metals to polymers is currently an interesting research area thanks to the capability of developing lightweight structures. Considering their miscellaneous applications in the automotive industry, aluminum and polyamide are chosen as the material combination for this study. There are three main challenges regarding laser joining of metals to polymers in general: significant difference between the melting points of the materials, adhesion at the interface, and the mechanical properties of the assembly.
The first challenge is addressed by in-situ heating observation and temperature measurement during the joining process. Therefore, polyamide thermal pyrolysis is effectively avoided by optimizing the laser joining parameters and employing power modulation.
The second one is studied by applying different surface treatments on the materials (laser-based and abrasive-based). The surfaces were tested by several characterization techniques before and after each surface treatment. The modification of the surface structure through an appropriate surface treatment leads to the improvement of wetting and adhesion between the melted polyamide and aluminum surface. Therefore, the alteration of a mixed failure (adhesive/cohesive) to a fully cohesive failure is the major step to enhance the mechanical properties of the assemblies. However, in the absence of bubbles, the structural modification of polyamide during the joining process is responsible for the failure. Energy-dispersive X-ray1 mapping and Time-of-Flight Secondary Ion Mass Spectrometry2 shows the physicochemical bonding between aluminum oxide and the polyamide at the interface.
To further enhance the mechanical properties of the assemblies, the structure of the polyamide near the interface of metal/polymer is addressed. For this purpose, laser treatment of polyamide, post-heat treatment, and joining with different feed rates were implemented. Finally, the shear strength of approximately 45 MPa on average is achieved for the assembly of laser-polished aluminum laser-joined to the polyamide with 2 and 5 mm/s feed rate.
Fonds National de la Recherche - FnR
Researchers ; Professionals ; Students
http://hdl.handle.net/10993/48517
FnR ; FNR11633333 > Mahdi Amne Elahi > LAMP > Process Innovation For Sensors In Mobile Applications Based On Laser Assisted Metal-plastic Joining > 01/11/2017 > 31/10/2021 > 2017

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