Mechanical Uniaxial Compression of 3D-Printed Non-Periodic ASA Lattice Structures Using Semi-Controlled Design Models

This study investigated the mechanical behavior of 3D-printed stochastic lattice structures using a semi-controlled design. This study aims to predict and optimize the mechanical response under compressive stress acting on the lattice structures of Acrylic Styrene Acrylonitrile (ASA) filaments. Shifting from stochastic to semi-controlled tesselation using Rhinoceros 7 software enables the effective creation of proposed design models and thus achieves predictable and reliable mechanical responses. The design parameters, including nodal formation, strut thickness, and lattice generation based on a predefined geometric routine, are associated with the regulation of the relative density. This approach aims to minimize the effect of relative density on the actual stiffness and strength evaluation. The findings focused on compressing the structures’ designs generated via a parabolically distributed Voronoi population to failure and observing their mechanical response through the stress-strain fluctuation analysis. Three distinct behavior stages are observed: elastic range, plastic range, and collapse without densification. The influence of crosslink geometry on the elastic responses was highlighted, with parabolic configurations affecting the peak stresses and elastic line slopes. The structures exhibited purely brittle behavior, characterized by abrupt local cracking and oscillatory plateau formation in the plastic stage.