| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling and Simulation: Microstructure, Mechanics, and Process
|
| Presentation Title |
Modeling Collapse Behavior in Large-scale Thermoset Additive Manufacturing |
| Author(s) |
Stian Romberg, Chris Hershey, John Lindahl, Abrian I. Abir, Michael DeVinney, Chad Duty, Vlastimil Kunc, Brett Compton |
| On-Site Speaker (Planned) |
Stian Romberg |
| Abstract Scope |
Over the last several years, 3D printing of thermoset polymer resins has progressed rapidly. Thermosets offer desirable properties and excellent compatibility with fibers. Additionally, they can be deposited at room temperature, avoiding the residual stresses and poor interlayer bonding caused by the large thermal gradients in thermoplastic material extrusion additive manufacturing (AM). However, pursuits to scale up thermosets have highlighted issues with print stability. This presentation will describe efforts to quantify deformation mechanisms in large-scale printed thermosets and to link measurable rheological properties to collapse in tall, thin printed walls using self-weight buckling and yielding models. Findings reveal that the observed buckling instability is governed by the recovered storage modulus of the material after a period of high shear stress representative of that experienced in the deposition nozzle. The talk will conclude with discussion of how these results can inform material design and print parameter selection for large-scale thermoset AM. |