Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 14 April 2020 / Approved: 15 April 2020 / Online: 15 April 2020 (14:21:45 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Materials 2020, 13, 2171
DOI: 10.3390/ma13092171

## Abstract

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 blasting, combined blasting and etching, thermal spraying and laser ablation, are investigated. The experiments are carried out on a novel 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

## Keywords

polymer-metal-hybrid; surface pretreatment; mechanical interlocking; roughness evaluation; interlaminar shear strength; interlaminar tensile strength; fractal geometry; laser structuring

## Subject

MATERIALS SCIENCE, Polymers & Plastics

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