Mechanics-guided manufacturing optimization framework to enhance the strength of architected lattice made from recycled plastic wastes AITranslate

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DOI：https://doi.org/10.1016/j.addma.2024.103997

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Improving the built quality of printed objects is commonly tackled from a material composition or manufacturing processing perspective, but mechanics also play a critical role in controlling performance of the printed parts. In this study, we investigate lattices that are manufactured with recycled PLA (Polylactic Acid) using a mechanics-guided approach, which assigned optimal printing parameters to specific struts according to a possible tensile, compressive, and flexural stress state. We identify the optimal combinations of nozzle temperature, printing speed, and layer heights using standard test specimens for each loading scenario, The strengths of specimens with optimal parameters are up to 23% higher than those with default parameters. Guided by simulations and experiments, we then compared the compressive strength and energy absorption of recycled PLA lattices fabricated by programmable printing parameter sets against those with default parameter sets without considering mechanical features. Strength and energy-absorbing ability can be improved by up to 25.52% and 140.22% respectively. Overall, we validate the role of mechanics in fabricating a 3D-printed object and envision that our approach is universal and applicable to improving the mechanical properties of any given geometries printed by other methods and with other base materials.