Static and Cyclic Fatigue of Ceramic Materials
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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Static and cyclic fatigue characteristics were determined for two ceramic materials, an alumina AD-94 and a hot-pressed boron carbide B4C. The static fatigue limits determined in three-point flexure were 23,500 psi for Al2, O3 and 43,000 psi for B4C, while the cyclic fatigue limits determined by stressing a cantilevered beam were 21,700 psi for the Al2O3 and 28,500 psi for the B4C. Examination of fracture surfaces by scanning and transmission electron microscopy revealed the fracture to be of a transgranular and intergranular nature for both materials. Fracture initiated at the tension surface and propagated immediately to failure. There was no change in fracture appearance in either the static or cyclic mode of failure.
- Ceramics, Refractories and Glass