Analysis of precracking parameters for ceramic single-edge-precracked-beam specimensThe single-edge-precracked-beam (SEPB) method involves creation of a straight-through crack from an indentation crack. The straight-through crack is developed by applying a controlled bending load to a specimen via a precracking fixture. The fixture induces the following sequence: (1) stable growth of the indentation crack; (2) pop-in; and finally, (3) arrest - thereby forming a straight-through precrack. The effects of indentation load on precracking load as well as precrack size were studied for experimental variables such as specimen width, fixture span, and material. Finite element analysis was used to obtain the stress distribution and stress intensity factor, thus providing a quantitative prediction of the precracking load and precrack size for silicon nitride, alumina, silicon carbide, and two SiC whisker-reinforced silicon nitrides. Fracture toughness values obtained from the SEPB method were compared with those obtained from other methods.
Document ID
19930054890
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Choi, Sung R. (NASA Lewis Research Center Cleveland, OH, United States)
Chulya, Abhisak (Cleveland State Univ.; NASA, Lewis Research Center OH, United States)
Salem, Jonathan A. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Fracture mechanics of ceramics. Vol. 10 - Fracture fundamentals, high-temperature deformation, damage, and design; Proceedings of the 5th International Symposium, Nagoya, Japan, July 15-17, 1991 (