Strength Degradation from Contact Fatigue in Self-toughened Glass-ceramics

  • Lee, Kee Sung (Energy Materials Research Team, Korea Institute of Energy Research) ;
  • Kim, Do Kyung (Dept. of Mat. Sci. and Eng., Korea Advanced Institute of Science and Technology) ;
  • Woo, Sang Kuk (Energy Materials Research Team, Korea Institute of Energy Research) ;
  • Han, Moon Hee (Energy Materials Research Team, Korea Institute of Energy Research)
  • Published : 2001.06.01


We investigated strength degradations from cyclic contact fatigue in self-toughened glass-ceramics. Hertzian indentation was used to induce cyclic contact load. Dynamic fatigue was also performed with changing stress rates from 0.01 to 10000 MPa/sec. After that, strength data and fracture origins were analysed. As the number of contact cycles increased or stressing rate decreased, severe strength degradation occurred by as much as 50% because of radial cracks developed from microcrack coalescence.



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