Title

Finite Element Modeling of Internal Stress Factors for ZrB₂ - SiC Ceramics

Alternative Title

Finite element modeling of internal stress factors for ZrB2 - SiC ceramics

Abstract

Commercial finite element modeling software (ABAQUS and OOF2) was used to calculate the internal stresses produced during cooling after hot pressing of ZrB2 - SiC ceramics. The size and shape of the SiC inclusions was varied to determine their effect on the residual stresses. Alternate SiC particle shapes designed to limit residual tensile stresses were modeled to minimize residual thermal stresses. Models were validated by measuring actual residual stresses by neutron diffraction. Due to the high neutron absorption of the more common boron isotopes, ZrB2-SiC parts were fabricated by reactive hot pressing using isotopically pure "Boron for these experiments. Characterization of the "B materials confirmed similar microstructure and material properties (hardness, Young's modulus and flexure strength) to parts made using powders containing naturally occurring boron. While exact residual stresses for the ZrB2-SiC composites have yet to be determined, models to investigate the trends in SiC particle size and shape effects, and a method to create neutron diffraction compatible materials, have been accomplished.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Mechanical Properties

Library of Congress Subject Headings

Boron compounds
Boron
Ceramic materials
Neutrons - Diffraction
Neutrons
Residual stresses
Silicon carbide
Strength of materials

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2009 American Ceramic Society, All rights reserved.

This document is currently not available here.

Share

 
COinS