Jon Spangenberg
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View article: Subvoxel Control of Fiber Orientation via Multidirectional Shearing in 3D Printing
Subvoxel Control of Fiber Orientation via Multidirectional Shearing in 3D Printing Open
Anisotropy, the characteristic of materials exhibiting different properties based on their direction, is widespread in nature. Conventional manufacturing techniques often fall short in recreating such complex anisotropy. While 3D printing …
View article: Impact of cross and main diffusion coefficients on symmetry breaking in nonreactive diffusion systems
Impact of cross and main diffusion coefficients on symmetry breaking in nonreactive diffusion systems Open
Diffusion-triggered convection can occur in a gravitationally stable system of two superimposed mixtures. As instability develops, two distinct patterns may emerge: double-diffusive (DD) or diffusion-layer convection (DLC). Traditionally, …
View article: Numerical Analysis of Coaxially 3D Printed Lunar Habitats: Integrating Regolith and PCM for Passive Temperature Control
Numerical Analysis of Coaxially 3D Printed Lunar Habitats: Integrating Regolith and PCM for Passive Temperature Control Open
Space research is shifting its focus from low-gravity platforms to Moon and Mars exploration, requiring advanced habitat construction. This paper proposes to integrate the 3D printing of regolith and Phase Change Materials (PCM), with a pa…
View article: Self‐Maintainable Electronic Materials with Skin‐Like Characteristics Enabled by Graphene‐PEDOT:PSS Fillers
Self‐Maintainable Electronic Materials with Skin‐Like Characteristics Enabled by Graphene‐PEDOT:PSS Fillers Open
Conventional devices lack the adaptability and responsiveness inherent in the design of nature. Therefore, they cannot autonomously maintain themselves in natural environments. This limitation is primarily because of using rigid and fragil…
View article: A Virtual 3D Printing Framework for Off-Earth Construction
A Virtual 3D Printing Framework for Off-Earth Construction Open
3D printing, due to its digital nature, offers a practical approach to autonomous off-Earth construction by utilizing local materials, thereby reducing the reliance on Earth-based resources and manpower. Implementing large-scale and rapid …
View article: Reducing Displacements in Thermoset 3D-Printed Formwork by Optimizing Ribs and Tie-rod Placement
Reducing Displacements in Thermoset 3D-Printed Formwork by Optimizing Ribs and Tie-rod Placement Open
3D-printed formwork shows great potential for concrete casting, as it can be used for complex shapes while reducing costs, labor, waste, and material usage. However, a significant challenge arises when the formwork exhibits excessive displ…
View article: Analyzing Homogeneity of Highly Viscous Polymer Suspensions in Change Can Mixers
Analyzing Homogeneity of Highly Viscous Polymer Suspensions in Change Can Mixers Open
The mixing of highly viscous non-Newtonian suspensions is a critical process in various industrial applications. This computational fluid dynamics (CFD) study presents an in-depth analysis of non-isothermal mixing performance in change can…
View article: Subvoxel control of fiber orientation via multidirectional shearing in 3D printing
Subvoxel control of fiber orientation via multidirectional shearing in 3D printing Open
Anisotropy, the characteristic of materials exhibiting different properties based on their direction1,2,3,4, is widespread in nature. Conventional manufacturing techniques5 often fall short in recreating such complex, localized anisotropy6…
View article: Using viscoplastic fluid to suppress part sedimentation in volumetric additive manufacturing
Using viscoplastic fluid to suppress part sedimentation in volumetric additive manufacturing Open
Volumetric additive manufacturing (VAM) presents several advantages, notably reduced printing times and high surface quality. Yet, a persistent challenge is sedimentation during printing, impacting the geometric fidelity of printed objects…
View article: Printing vertical flat surfaces in thermoset big area additive manufacturing
Printing vertical flat surfaces in thermoset big area additive manufacturing Open
In extrusion-based additive manufacturing, achieving high surface quality typically involves using small layer heights to reduce the size of grooves between layers. However, this approach can be both less effective and time-consuming in bi…
View article: Optimizing <scp>TPU</scp> performance: The role of mold temperature on injection molding of <scp>TPU</scp>
Optimizing <span>TPU</span> performance: The role of mold temperature on injection molding of <span>TPU</span> Open
This study explores the influence of mold temperatures below 60°C on thermoplastic polyurethane (TPU) properties during injection molding, focusing on phase separation and its impact on mechanical, thermal, and viscoelastic properties. Usi…
View article: Numerical investigation of continuous mixing of highly viscous, non-Newtonian polymer suspensions by a starved-fed single-screw extruder
Numerical investigation of continuous mixing of highly viscous, non-Newtonian polymer suspensions by a starved-fed single-screw extruder Open
Proper mixing of highly viscous, non-Newtonian, multicomponent fluids is complex but essential in industries such as food, catalyst production, and medical device manufacturing. Continuous mixing offers advantages such as more homogeneous …
View article: Rheology and printability of cement paste modified with filler from manufactured sand
Rheology and printability of cement paste modified with filler from manufactured sand Open
Manufactured sand is increasingly used in concrete production. We study the effects of substituting parts of the binder with manufactured filler (particle size 0.04 - 0.250 mm) on the printability of cement paste experimentally and numeric…