Uncertainty quantification in elastic constants of SiCf/SiCm tubular composites using global sensitivity analysis

Author:

Thandaga Nagaraju Hemanth1ORCID,Nance James2,Kim Nam H1ORCID,Sankar Bhavani1,Subhash Ghatu1

Affiliation:

1. University of Florida, Department of Mechanical and Aerospace Engineering, Gainesville, FL, USA

2. University of Florida, Department of Material Science and Engineering, Gainesville, FL, USA

Abstract

Silicon carbide fiber and silicon carbide matrix (SiCf/SiCm) tubes produced through the chemical vapor infiltration process have become a candidate cladding material in nuclear applications. The performance of this composite is influenced by many variables such as braiding angle, porosity, material properties, etc., which vary over a range of values due to the inherent fluctuations in the manufacturing process. In this study, the variability in elastic constants of SiCf/SiCm composite has been quantified through multiscale finite element (FE) simulations, variable screening, and high-fidelity surrogate modeling. The key variables dominantly affecting the elastic constants of SiCf/SiCm tubes were identified using global sensitivity analysis. A surrogate to the high-fidelity FE-based model was used in Monte Carlo simulations to generate a hundred thousand samples from which the uncertainty in elastic constants was assessed. It turned out that the coefficient of variation was less than 10%.

Funder

Nuclear Energy University Programs

Publisher

SAGE Publications

Subject

Materials Chemistry,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites

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