About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Mitigating Thermal Distortion in Wire Arc Additive Manufacturing thru Integrating Topology Optimization and Modified Inherent Strain Modeling |
Author(s) |
Wen Dong, Carter D. Gassler, Xavier Jimenez, Albert C. To |
On-Site Speaker (Planned) |
Wen Dong |
Abstract Scope |
The heat accumulation during the wire arc additive manufacturing (WAAM) process may result in significant residual stress and distortion in the as-built part. Although the subsequent heat treatment can relieve the residual stress, most of the distortion remains, harming product quality and making post- processing like machining and cutting more difficult. In the present work, a fixture attached to the substrate bottom is designed to reduce distortion in the as-built part. The design is achieved by using topology optimization to reduce weight and distortion by incorporating the modified inherent strain (MIS) method into the optimization. The MIS method is employed to implement the load in each iteration of the optimization in order to simulate the deposition process. The effect of heat accumulation is included by assigning temperature-dependent inherent strains to each layer. The topology optimized design is further modified to satisfy various manufacturability criteria. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |