301 citations · 883 across the 17 of their papers we have counts for
17 papers
Exploration of improved, roller-based spreading strategies for cohesive powders in additive manufacturing via coupled DEM-FEM simulations
Reimar Weissbach, Patrick M. Praegla, Wolfgang A. Wall +2
Spreading of fine (D50 <=20um) powders into thin layers typically requires a mechanism such as a roller to overcome the cohesive forces between particles. Roller-based spreading re…
Learning to write with the fluid rope trick
Gaurav Chaudhary, Stephanie Christ, A John Hart +1
The range and speed of direct ink writing, the workhorse of 3d and 4d printing, is limited by the practice of liquid extrusion from a nozzle just above the surface to prevent insta…
A spiral laser scanning routine for powder bed fusion inspired by natural predator-prey behavior
Suh In Kim, A. John Hart
Additive manufacturing by laser powder bed fusion (LPBF) offers material versatility, capability for complex geometries, and control of mechanical properties and microstructure. Ho…
A Testbed for Investigation of Selective Laser Melting at Elevated Atmospheric Pressure
David A. Griggs, Jonathan S. Gibbs, Stuart P. Baker +3
Metal additive manufacturing (AM) by laser powder bed fusion (L-PBF) builds upon fundamentals established in the field of laser welding which include the influence of gas and plume…
Spatial Mapping of Powder Layer Density for Metal Additive Manufacturing via X-ray Microscopy
Ryan W. Penny, Patrick M. Praegla, Marvin Ochsenius +4
Uniform powder spreading is a requisite for creating consistent, high-quality components via powder bed additive manufacturing (AM), wherein layer density and uniformity are comple…
Physics-Based Modeling and Predictive Simulation of Powder Bed Fusion Additive Manufacturing Across Length Scales
Christoph Meier, Sebastian L. Fuchs, Nils Much +10
Powder bed fusion additive manufacturing (PBFAM) of metals has the potential to enable new paradigms of product design, manufacturing and supply chains while accelerating the reali…
A novel smoothed particle hydrodynamics formulation for thermo-capillary phase change problems with focus on metal additive manufacturing melt pool modeling
Christoph Meier, Sebastian L. Fuchs, A. John Hart +1
Laser-based metal processing including welding and three dimensional printing, involves localized melting of solid or granular raw material, surface tension-driven melt flow and si…
Is Machine Learning Able to Detect and Classify Failure in Piezoresistive Bone Cement Based on Electrical Signals?
Hamid Ghaednia, Crystal E. Owens, Lily E. Keiderling +4
At an estimated cost of $8 billion annually in the United States, revision surgeries to total joint replacements represent a substantial financial burden to the health care system.…
Improved Rheometry of Yield Stress Fluids Using Bespoke Fractal 3D Printed Vanes
Crystal E. Owens, A. John Hart, Gareth H. McKinley
To enable robust rheological measurements of the properties of yield stress fluids, we introduce a class of modified vane fixtures with fractal-like cross-sectional structures. A g…
Plasticity and damage mechanisms in Ti-6Al-4V printed with selective laser melting
Atieh Moridi, Ali Gökhan Demir, Leonardo Caprio +3
The ability to create complex geometries with tailored material properties has brought interest in using additive manufacturing (AM) techniques in various industrial applications.…
Critical Influences of Particle Size and Adhesion on the Powder Layer Uniformity in Metal Additive Manufacturing
Christoph Meier, Reimbar Weissbach, Johannes Weinberg +2
The quality of powder layers, specifically their packing density and surface uniformity, is a critical factor influencing the quality of components produced by powder bed metal add…
Modeling and Characterization of Cohesion in Fine Metal Powders with a Focus on Additive Manufacturing Process Simulations
Christoph Meier, Reimar Weissbach, Johannes Weinberg +2
The cohesive interactions between fine metal powder particles crucially influence their flow behavior, which is in turn important to many powder-based manufacturing processes inclu…
Crack formation in wet colloidal pillars
Justin Beroz, Alvin T. L. Tan, Ken Kamrin +1
We investigate the initiation of cracks in vertically freestanding water-saturated colloidal pillars constructed using a direct-write technique. Paradoxically, the cracks form duri…
Thermophysical Phenomena in Metal Additive Manufacturing by Selective Laser Melting: Fundamentals, Modeling, Simulation and Experimentation
Christoph Meier, Ryan W. Penny, Yu Zou +2
Among the many additive manufacturing (AM) processes for metallic materials, selective laser melting (SLM) is arguably the most versatile in terms of its potential to realize compl…
Fast Desktop-Scale Extrusion Additive Manufacturing
Jamison Go, A. John Hart
Significant improvements to the production rate of additive manufacturing (AM) technologies are essential to their cost-effectiveness and competitiveness with traditional processin…
Twist Coupled Kirigami Cellular Metamaterials and Mechanisms
Nigamaa Nayakanti, Sameh H. Tawfick, A. John Hart
Manipulation of thin sheets by folding and cutting offers opportunity to engineer structures with novel mechanical properties, and to prescribe complex force-displacement relations…
Fabrication and electrical integration of robust carbon nanotube micropillars by self-directed elastocapillary densification
Michael De Volder, Sei Jin Park, Sameh H. Tawfick +2
Vertically-aligned carbon nanotube (CNT) "forest" microstructures fabricated by chemical vapor deposition (CVD) using patterned catalyst films typically have a low CNT density per…