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Estimation of the Adhesion Interface Performance in Aluminum-PLA Joints by Thermographic Monitoring of the Material Extrusion Process

: Bechtel, Stephan; Meisberger, Mirko; Klein, Samuel; Heib, Tobias; Quirin, Steven; Herrmann, Hans-Georg

Fulltext urn:nbn:de:0011-n-5993749 (6.6 MByte PDF)
MD5 Fingerprint: f106bbaeabf5521de305d8df4d3effbe
Created on: 11.8.2020

Materials 13 (2020), No.15, Art. 3371, 19 pp.
ISSN: 1996-1944
Journal Article, Electronic Publication
Fraunhofer IZFP ()
additive manufacturing; material extrusion; thermographic process monitoring; polymer–metal hybrid structures; adhesion interface performance

Using additive manufacturing to generate a polymer–metal structure offers the potential to achieve a complex customized polymer structure joined to a metal base of high stiffness and strength. A tool to evaluate the generated interface during the process is of fundamental interest, as the sequential deposition of the polymer as well as temperature gradients within the substrate lead to local variations in adhesion depending on the local processing conditions. On preheated aluminum substrates, 0.3 and 0.6 mm high traces of polylactic acid (PLA) were deposited. Based on differential scanning calorimetry (DSC) and rheometry measurements, the substrate temperature was varied in between 150 and 200 °C to identify an optimized manufacturing process. Decreasing the layer height and increasing the substrate temperature promoted wetting and improved the adhesion interface performance as measured in a single lap shear test (up to 7 MPa). Thermographic monitoring was conducted at an angle of 25° with respect to the substrate surface and allowed a thermal evaluation of the process at any position on the substrate. Based on the thermographic information acquired during the first second after extrusion and the preset shape of the polymer trace, the resulting wetting and shear strength were estimated.