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 |
A Dislocation Mechanism Based Constitutive Model for Hierarchical Anisotropic Materials |
Author(s) |
Chamara Herath, Ajit Achuthan |
On-Site Speaker (Planned) |
Chamara Herath |
Abstract Scope |
The development of a hierarchical microstructure informed crystal plasticity based constitutive model that accounts for the geometric and mechanistic effects of the features of different length scales such as grains and subgranular solidification cells is presented. The developed model relies on three major strengthening mechanisms: the boundary strengthening, the geometrically necessary dislocation strengthening, and the back stress effect. The size and shape effect of individual grains are accounted by considering the grains as ellipsoids and cells as tubular structures with circular cross sections. The anisotropic effect of cellular structure is also introduced. Homogenization schemes are developed to simplify the implementation of the constitutive model on a finite element analysis (FEA) network. The model is validated experimentally by testing 316L coupon specimens manufactured by laser engineered net shaping (LENS). Predicted stress-strain behaviors agreed very well with those obtained experimentally, both in the loading and building directions. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |
Keywords |
Aluminum, |