Fatigue Behaviour of Additively Manufactured Short Fibre Reinforced Polyamide

•A short carbon fibre reinforced polyamide is tested under tensile-tensile fatigue.•The material behaviour is closer to that of polymers than to that of composites.•A thermal and a mechanical fatigue regimes were observed.•Fatigue testing of specimens with ± 45° presents several challenges. Additive...

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Bibliographic Details
Published in:International journal of fatigue 2023-09, Vol.174, p.107711, Article 107711
Main Authors: Panerai, A., Canegrati, A., Martulli, L.M., Kostovic, M., Rollo, G., Sorrentino, A., Carboni, M., Bernasconi, A.
Format: Article
Language:English
Subjects:
Additive Manufacturing
Carbon Fibre
Discontinuous Reinforcement
Mechanical Testing
Polymer-matrix Composites
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Summary:•A short carbon fibre reinforced polyamide is tested under tensile-tensile fatigue.•The material behaviour is closer to that of polymers than to that of composites.•A thermal and a mechanical fatigue regimes were observed.•Fatigue testing of specimens with ± 45° presents several challenges. Additive manufacturing of Short Fibre Reinforced Polymers (SFRPs) combines good mechanical properties with high design flexibility. In this work, fatigue tests were performed on SFRP specimens with 0°/90° and ±45° raster orientations. Thermal and mechanical fatigue regimes were both observed. In thermal fatigue, self-heating, softening and changes in viscoelastic properties occurred. In mechanical fatigue, the material progressively stiffened, and dissipative effects due to viscoelasticity were reduced. Such a behaviour is unusual for composites, but mainly seen in neat polymers. These results suggest the fatigue behaviour of this material to be dominated by the polyamide matrix.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2023.107711