|About this Abstract
||7th World Congress on Integrated Computational Materials Engineering (ICME 2023)
||Uncertainty Quantification in Internal Stress Distribution Via Integrated High-energy Synchrotron X-ray Experiments and Crystal Plasticity Simulations
||Diwakar Naragani, Armand Beaudoin, Donald Boyce, Paul Shade
|On-Site Speaker (Planned)
We present an integrated experimental-modeling framework to quantify uncertainty during the calibration of crystal plasticity model parameters. In-situ X-ray diffraction microscopy measurements yield intergranular lattice orientations and strain tensors at designated states during R=-1 cyclic loading of a Ni-based superalloy. Intragranular fields of incompatible deformation are generated by post-processing measured strains via an anisotropic linear elastic constitutive model augmented by the theory of continuous distribution of dislocations. Complementary fields of back stress are generated via a crystal plasticity formulation with an Armstrong-Frederick-type back stress evolution law. The synthesis of simulated and measured deformation fields provides a basis for quantifying uncertainty in the parameters for evolution of back stress. Preferred reorientation of the crystallographic lattices along with these internal stresses govern the onset of plasticity and the activation of multiple slip systems which develop
complex residual stresses. The framework provides a pipeline to calibrate and quantify uncertainty in alternate material models.