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

## TL;DR

This paper studies how 3D-printed lattice structures made with a semi-controlled design respond to compression, aiming to improve predictability and reliability in their mechanical behavior.

## Contribution

The novelty lies in using a semi-controlled design approach to generate predictable mechanical responses in stochastic 3D-printed lattice structures.

## Key findings

- Three distinct mechanical behavior stages were observed: elastic, plastic, and collapse.
- Parabolic Voronoi configurations influenced peak stresses and elastic line slopes.
- Structures showed brittle behavior with abrupt cracking and oscillatory plateau formation.

## Abstract

This work examines the mechanical behaviour of 3D-printed stochastic lattice structures fabricated using a semi-controlled design. A primary goal is to predict and optimize the mechanical response of these Acrylic Styrene Acrylonitrile (ASA) filament structures when subjected to compressive stress. By transitioning from a purely stochastic method to a semi-controlled tessellation approach within Rhinoceros 7 software, we effectively generated the proposed design models. This methodology results in mechanical responses that are both predictable and reliable. 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. Our findings are cantered on the compressive testing of structures, which were generated using a Voronoi population distributed along a parabolic curve. We analyzed their mechanical response to the point of failure by examining stress–strain fluctuations. Three distinct behaviour 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 behaviour, characterized by abrupt local cracking and oscillatory plateau formation in the plastic stage.