Stochastic Multiphysics Framework for Ceramic Matrix Composites including Optimal Quantification of Scale-Dependent Variability
Abstract
A stochastic multiphysics modeling framework, coupling research on scale-dependentvariability, multiscale thermomechanical constitutive models, and progressive damage theories,including interfacial debonding, with carefully designed experiments is proposed. The goal is todevelop a fundamental understanding of material behavior, system level response, and damage inceramic matrix composites (CMC) under complex thermomechanical loading. This will beaccomplished through coordinated research in material characterization, optimal uncertaintyquantification, and multiphysics models that span and integrate length scales from micro- to thestructural scale. The effects of variability in microstructure, material properties, and geometrywill be quantified through a novel uncertainty quantification technique that uses classical andBayesian sampling techniques, reduced order models, and sensitivity analyses. The complexstress states, loading histories, and multiscale nature of defects and their uncertain propagation inthese material systems will be simulated using a set of focused test problems. Damage evolutionand propagation under selected loading conditions will be studied for improved understanding ofcritical damage modes such as matrix microcracking, fiber breakage and fiber/matrix debonding.The proposed methodology will be useful in a variety of applications including the improveddamage detection and life prediction models of CMC structural systems. Methodologicaldevelopments will be steered by a closed-loop validation plan that incorporates both simulationand experimental test data.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501810129
Entities
People
- Aditi Chattopadhyay
Organizations
- Air Force Office of Scientific Research
- Arizona State University
- United States Air Force