Investigation of Stress Concentrations in Stereolithographic Modeled Parts
Faculty Mentor Name
David Lanning
Format Preference
Poster
Abstract
Rapid prototyping using additive manufacturing has an ever-increasing presence in industry. Stereolithography (SLA) is a widely utilized form of additive manufacturing that has seen significant adoption in recent years. While SLA offers numerous advantages, there remains a lack of knowledge regarding how specific geometric features, such as notches, influence the mechanical properties of SLA-manufactured components. This study aims to address this gap by investigating stress concentrations induced by circular notches in fully solid (100% infill) SLA parts. The primary purpose is to enhance understanding of how notches affect the mechanical properties of SLA components, where existing knowledge is limited. Previous work focused on Fused Deposition Modeling (FDM), a widely used additive manufacturing technique, have explored how process parameters influence the mechanical properties of printed parts. Research has highlighted a significant knowledge gap regarding the effects of specimen geometry and infill parameters on mechanical performance. To address this, prior work constrained infill to a ‘gyroid’ pattern with densities of 20%, 40%, and 60%, and investigated stress concentrations caused by notches and holes. These studies revealed unexpected results, contradicting traditional solid mechanics theories for predicting failure and crack propagation. Specimen geometries, including "v" notches, elliptical holes, circular holes, and semi-circular notches, were tested, showing that sharper features like "v" notches increase maximum stress and crack likelihood compared to smoother curves. Findings also indicated that solid shells in 3D-printed parts reinforce edges, reducing stress concentration factors, influencing the development of failure theories for 3D-printed products.
Investigation of Stress Concentrations in Stereolithographic Modeled Parts
Rapid prototyping using additive manufacturing has an ever-increasing presence in industry. Stereolithography (SLA) is a widely utilized form of additive manufacturing that has seen significant adoption in recent years. While SLA offers numerous advantages, there remains a lack of knowledge regarding how specific geometric features, such as notches, influence the mechanical properties of SLA-manufactured components. This study aims to address this gap by investigating stress concentrations induced by circular notches in fully solid (100% infill) SLA parts. The primary purpose is to enhance understanding of how notches affect the mechanical properties of SLA components, where existing knowledge is limited. Previous work focused on Fused Deposition Modeling (FDM), a widely used additive manufacturing technique, have explored how process parameters influence the mechanical properties of printed parts. Research has highlighted a significant knowledge gap regarding the effects of specimen geometry and infill parameters on mechanical performance. To address this, prior work constrained infill to a ‘gyroid’ pattern with densities of 20%, 40%, and 60%, and investigated stress concentrations caused by notches and holes. These studies revealed unexpected results, contradicting traditional solid mechanics theories for predicting failure and crack propagation. Specimen geometries, including "v" notches, elliptical holes, circular holes, and semi-circular notches, were tested, showing that sharper features like "v" notches increase maximum stress and crack likelihood compared to smoother curves. Findings also indicated that solid shells in 3D-printed parts reinforce edges, reducing stress concentration factors, influencing the development of failure theories for 3D-printed products.