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Open AccessArticle

Introducing Fractal Dimension for Interlaminar Shear and Tensile Strength Assessment of Mechanically Interlocked Polymer–Metal Interfaces

1
Materials and Surface Engineering Group, Faculty of Mechanical Engineering, Chemnitz University of Technology, Erfenschlager Straße 73, D-09125 Chemnitz, Germany
2
Micromanufacturing Technology Group, Faculty of Mechanical Engineering, Chemnitz University of Technology, Reichenhainer Straße 70, D-09126 Chemnitz, Germany
*
Author to whom correspondence should be addressed.
Materials 2020, 13(9), 2171; https://doi.org/10.3390/ma13092171
Received: 14 April 2020 / Revised: 4 May 2020 / Accepted: 6 May 2020 / Published: 8 May 2020
The interlaminar strength of mechanically interlocked polymer–metal interfaces is strongly dependent on the surface structure of the metal component. Therefore, this contribution assesses the suitability of the fractal dimension for quantification of the surface structure, as well as interlaminar strength prediction of aluminum/polyamide 6 polymer–metal hybrids. Seven different surface structures, manufactured by mechanical blasting, combined mechanical blasting and etching, thermal spraying, and laser ablation, are investigated. The experiments are carried out on a butt-bonded hollow cylinder testing method that allows shear and tensile strength determination with one specific specimen geometry. The fractal dimension of the metal surfaces is derived from cross-sectional images. For comparison, the surface roughness slope is determined and related to the interlaminar strength. Finally, a fracture analysis is conducted. For the investigated material combination, the experimental results indicate that the fractal dimension is an appropriate measure for predicting the interlaminar strength. View Full-Text
Keywords: fractal geometry; interlaminar tensile strength; interlaminar shear strength; strength prediction; roughness evaluation; mechanical interlocking; surface structuring; polymer–metal hybrid; laser micromachining fractal geometry; interlaminar tensile strength; interlaminar shear strength; strength prediction; roughness evaluation; mechanical interlocking; surface structuring; polymer–metal hybrid; laser micromachining
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MDPI and ACS Style

Saborowski, E.; Steinert, P.; Dittes, A.; Lindner, T.; Schubert, A.; Lampke, T. Introducing Fractal Dimension for Interlaminar Shear and Tensile Strength Assessment of Mechanically Interlocked Polymer–Metal Interfaces. Materials 2020, 13, 2171.

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