About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Special Session
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Presentation Title |
A Dislocation Density Based Constitutive Model for the Design of Additively Manufactured (AM) Metals and Alloys |
Author(s) |
Chamara Herath, Janith Wanniarachchi, Ajit Achuthan |
On-Site Speaker (Planned) |
Ajit Achuthan |
Abstract Scope |
Classical crystal plasticity based constitutive models are inept at capturing the effects of complex hierarchical microstructures of additively manufactured (AM) components. Therefore, microstructure informed constitutive models which apprehend the sub grain level features are important for the design and development of components for advanced applications. In this presentation, the development of a microstructure informed crystal plasticity based constitutive model that accounts for the geometric and mechanistic effects of the grains and other sub grain features will be discussed. The size and shape effect of individual grains are accounted by considering the grains as ellipsoids, containing a core and mantle with different shear strain parameters. The effect of cellular structure is accounted following a dislocation density based approach, treating the cellular structure as tubular structures with hexagonal cross sections. Model is validated experimentally by testing coupon 316L samples manufactured by laser engineered net shaping (LENS). |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |