About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
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Symposium
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6th International Congress on 3D Materials Science (3DMS 2022)
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Presentation Title |
Interpretation of Intragranular Strain Fields in High-energy Synchrotron X-ray Experiments via Finite Element Simulations and Analysis of Incompatible Deformation |
Author(s) |
Diwakar Naragani, Paul Shade, William Musinski, Mark Obstalecki, Donald Boyce, Armand Beaudoin, Joel Bernier, Darren Pagan |
On-Site Speaker (Planned) |
Diwakar Naragani |
Abstract Scope |
We present an integrated experimental-modeling framework developed to resolve intragranular fields of incompatible deformation. These fields are generated via an anisotropic linear elastic constitutive model augmented by the theory of continuous distribution of dislocations. We model the R=0 cyclic loading of a nickel-based superalloy performed at APS using a finite element simulation, which satisfies boundary conditions, mechanical equilibrium, and strain compatibility. Complementary in-situ X-ray diffraction microscopy measurements yield intergranular lattice orientations and strain tensors at designated states during the loading. The synthesis of simulated and measured deformation fields provides a mesoscopic view of the fundamental heterogeneity in polycrystalline response that creates localized stress “hot spots”. Preferred reorientation of the crystallographic lattices and intergranular stresses foreruns the onset of plasticity and promotes the activation of multiple slip systems. We ultimately show a positive correlation between residual stress and accrued incompatible deformation through specific examples and via a statistical approach. |
Proceedings Inclusion? |
Definite: Other |