Bars loaded by opposite concentrated forces via rollers are appropriate test specimens for the determination of the fracture toughness, and the crack resistance curve (R-curve) of ceramic materials. In this paper stress solutions for the proposed test specimens are provided, as well as the stress intensity factor and the T-stress solutions. As practical applications, R-curves are determined for a soft PZT ceramic and several alumina ceramics.
Issue Section:
Technical Papers
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.Copyright © 2004
by ASME
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