About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
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Presentation Title |
Determination of Constitutive Properties for Shape Memory Alloys from Nanoindentation Response |
Author(s) |
Xuesong Gao, Daniel Hong , Harshad Paranjape, Wei Zhang, Peter Anderson |
On-Site Speaker (Planned) |
Xuesong Gao |
Abstract Scope |
This work reports on a Bayesian inference approach, combined with finite element simulations of Berkovich nanoindentation, to determine the constitutive properties of shape memory materials. This builds on and extends prior efforts for isotropic, elastic-plastic materials. For shape memory materials (SMAs), the response is complicated by a stress-induced, reversible phase transformation that differs for tension versus compression and depends on crystallographic orientation and prior plastic deformation. To tackle this complexity, a high fidelity finite element model incorporating superelastic-plastic constitutive relation was developed and validated. Then numerous simulations were used to predict the nanoindentation response for a variety of SMAs with different constitutive parameters. The large dataset was used to train a Bayesian inference model and test it. The resulting inverse framework for SMAs predicts the stress-strain response from nanoindentation data, provides insight on the Oliver-Pharr formalism, and demonstrates the benefits of conducting repeated (2-cycle) versus conventional single indentation testing. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Phase Transformations, Mechanical Properties |