Work

Investigating thermal strains and chemical shrinkage in tomographic volumetric additive manufacturing

Year: 2025

Type: article

Abstract: Volumetric additive manufacturing provides many advantages over more traditional layer-based additive manufacturing methods by permitting support-free printing with isotropic material properties. However, accurate geometry reproduction remains a challenge. This work presents two models to investigate the contributions of thermal strains and chemical shrinkage to parts made via tomographic volumetric additive manufacturing. A thermal model, with invariant material properties and uniform cure progression, reproduces similar magnitude deformations to those seen experimentally. Through a parameter study and partial least squares regression, for a target cube geometry, deformations are found to be dominated by the heat transfer coefficient. A second model investigates non-uniform chemical shrinkage predicting smaller deformations but better capturing the deformed shape. This work concludes that a combination of primarily thermal strains and secondarily chemical shrinkage is thus required to capture this geometric infidelity paving the way to better understanding the deformation phenomena.

Source: Additive manufacturing

DOI: 10.1016/j.addma.2025.104781

Authors: Nicole Pellizzon, Berin Šeta, Carl Sander Kruse, Roozbeh Salajeghe, Jon Spangenberg

Institution: Technical University of Denmark

Language: English

Topic: Additive Manufacturing and 3D Printing Technologies

Subfield: Automotive Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,430

Funders: Danmarks Frie Forskningsfond, Danmarks Tekniske Universitet