Investigating mechanical properties of additively manufactured multimaterial gyroids: The effect of proportion, scale and shape AITranslate

Basic Information:

DOI：https://doi.org/10.1016/j.addma.2023.103784

Chinese Library Classification Number:

Citation Information:

Many naturally occurring materials exhibit repeating hierarchical structures, comprising of multiple constituent materials that combine to form a composite material. In this work an additive manufacturing technology known as Material Jetting is used to fabricate co-continuous multi-material structures. The structures are produced using two materials with distinctly different mechanical properties at a variety of proportions. The design of experiments was developed based on a triply periodic minimal surface known as the Gyroid, allowing for different scales and shapes with co-continuous material phases to be generated for a wide range of proportions. The resulting designs were assessed for stiffness, strength and ductility, using a combination of analytical models, finite element modelling and a quasi-static compressive experiment. It was found that the most important factor for strength and stiffness is the material proportion. The surface-type gyroid shape resulted in increased ductility, and slightly higher stiffness and strength compared to the network-type structure which demonstrated bending-type failure and a more gradual yielding behaviour. Using larger unit cells for the same volume (less unit cells per sample) resulted in a reduction in mechanical performance and greater error between modelling and physical experiments as boundary conditions began to dominate. The accuracy of the various modelling methods was also assessed, with the finite element method with periodic boundary conditions providing the best results for predicting the effect of shape, while the analytical power-law model provided the best fit to the experimental data.