Journal Published Online: 29 July 2020
Volume 9, Issue 5

Using Compliant Interlayers as Crack Arresters in 3-D-Printed Polymeric Structures

CODEN: MPCACD

Abstract

The aim of this study is to show the influence of using compliant interlayers as crack arresters for three-dimensional (3-D)-printed polymeric structures. To investigate the effectiveness of compliant interlayers, specimens consisting of a stiff and brittle matrix and thin compliant interlayers were printed. The results of these polymeric composites were compared to pure matrix material samples. To generate specimens, a commercially available material extrusion-based desktop 3-D-printer was used. Additively manufactured samples were tested in both impact as well as fracture mechanical tests. The application of a compliant interlayer as crack arrester showed high potential in both types of test. Instrumented Charpy impact tests according to EN ISO 179-2 revealed an increase of notched impact strength from 5.0 ± 0.1 kJm−2 to 25 kJm−2 (energy up to Fmax) and 136 ± 2.6 kJm−2 (total energy during testing), respectively. This indicates an increase of roughly 725% and 2,720%, while the maximum force during testing remained almost unchanged at approximately 200 N. Interestingly, the exact position as well as the number of compliant interlayers did not show a significant influence on the results. Therefore, tests that are more detailed were conducted on specimens including only a single interlayer. Further tests consisted of J-integral testing on specimens with aforementioned single compliant interlayers. Crack resistance (J-R curves) were generated using the multi-specimen approach and evaluation according to the protocol of the European Structural Integrity Society. Although a special data-shifting procedure has to be applied to interpret results more clearly, J-integral values showed a significant increase of 250 % at the interface between materials compared to the pure matrix material.

Author Information

Arbeiter, Florian J.
Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Leoben, Austria
Petersmann, Sandra
Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Leoben, Austria
Wiener, Johannes
Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Leoben, Austria
Oesterreicher, Florian
Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Leoben, Austria
Spoerk, Martin
Polymer Processing, Montanuniversitaet Leoben, Graz, Austria
Pinter, Gerald
Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Leoben, Austria
Pages: 13
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Stock #: MPC20190201
ISSN: 2379-1365
DOI: 10.1520/MPC20190201