| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Microstructure, Defects, and Properties
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| Presentation Title |
Phase Field Microelasticity Theory and Modeling of Dislocation Dynamics in an Elastically and Structurally Inhomogeneous Solid |
| Author(s) |
Song Ling Janel Chua, Brayan David Murgas Portilla, Abigail Hunter, Nithin Mathew |
| On-Site Speaker (Planned) |
Song Ling Janel Chua |
| Abstract Scope |
Study of defects and dislocations in additively manufactured materials is essential for improving its quality, performance, and safety. In this study, dislocation dynamics in an elastically and structurally inhomogeneous solid are simulated using three-dimensional phase-field microelasticity theory. The model used is based on the phase field model of dislocations [Acta Mater. 51 (2003) 4209, Phil. Trans. R. Soc. A 374: 20150166] and improved with an efficient damped iterative method [Scripta Mater. 60 (2009) 901]. The theory is based on simplifying an elastically inhomogeneous system into an elastically homogeneous system but with a heterogeneous misfit-generating stress-free strain. This gives us an equation for the strain energy of the “equivalent” homogeneous modulus system as a functional of the phase field. Systems with voids and inclusions(common defect types) are the cases covered by this model. Other misfitting defects, such as dislocations are also integrated into this model. |