Fatigue properties of 3D-printed polymeric metamaterials: A review

The present article provides an in-depth review of the fatigue properties of polymeric metamaterials, with particular emphasis on those manufactured using 3D printing techniques. Despite the significant potential of 3D-printed metamaterial polymers in the biomedical field, there has been limited studies dedicated to their fatigue behaviour. The article highlights the significance of fatigue behaviour in determining the reliability and longevity of polymeric materials under cyclic loading, which is crucial for biomedical applications. The effects of different 3D printing parameters, metamaterial designs, and polymer properties on fatigue life are explored. The fatigue response of metamaterials depends on material properties, geometric factors, and 3D printing parameters. Metamaterial geometries with sharp corners and high stress concentration zones have shown to be prone to early fatigue failure. Besides, thermal fatigue can contribute to fatigue damage of metamaterials particularly at high loading frequencies. Optimising designs for smooth geometries and considering thermal conductivity in polymers are crucial for enhancing fatigue resistance and durability in 3D printed metamaterials. The review emphasises the role of advanced computational modelling, combined with experimental studies, in optimising metamaterial design and manufacturing processes of polymers. The goal is to enhance fatigue resistance and expand their applications, particularly in the biomedical field.