Finite Element Modeling of Internal Stress Factors for ZrB₂ - SiC Ceramics
Finite element modeling of internal stress factors for ZrB2 - SiC ceramics
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.
M. P. Teague et al., "Finite Element Modeling of Internal Stress Factors for ZrB₂ - SiC Ceramics," Ceramic Engineering and Science Proceedings, American Ceramic Society, Jan 2009.
Materials Science and Engineering
Keywords and Phrases
Mechanical Properties; Boron compounds; Boron; Ceramic materials; Neutrons - Diffraction; Neutrons; Residual stresses; Silicon carbide; Strength of materials
Article - Conference proceedings
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