By I-Wei Chen, Shih-Yu Liu, David S. Jacobs (auth.), R. C. Bradt, D. P. H. Hasselman, D. Munz, M. Sakai, V. Ya. Shevchenko (eds.)
Fracture Mechanics of Fatigue of Structural Ceramics; I.W. Chen, etal. Fatigue habit of Sintered Al2O3 below Rotary Bending and Static Fatigue; H.N. Ko. Fatigue of Notched Alumina Specimens; D. Hertel, et al. Static and Cyclic Fatigue of Zirconia fabrics Measured through Double Torsion; J. Chevalier, et al. The Fatigue habit of MgPSZ and ZTA Ceramics; M.M. Nagl, et al. The impact of Processing options at the Fatigue houses of Yttria Stabilized Zirconia with diverse Grain Sizes; R. Matt, G. Grathwohl. Fatigue Crack Initiation and Propagation in Ceramics; A. Ueno, H. Kishimoto. On Fatigue and Facture habit of SiAlloyed Pyrolytic Carbon; L. Ma,et al. An research of Cyclic Fatigue results in Ceramic Matrix Composites; D. Koch, G. Grathwohl. Fatigue lifestyles Predications of PZT utilizing Continuum harm Mechanics and Finite point equipment; T.J.Chuang, et al. Crack progress in Ferroelectric Ceramics and Actuators lower than Mechanical and electric Loading; G.A. Schneider, et al. results of Residual pressure on Fracture sturdiness and Subcritical Crack development of Indented Cracks in numerous Glasses; M. Yoda, et al. choice of Threshold pressure depth issue for Subcritical Crack progress in Ceramic fabrics by way of Interrupted Static Fatigue try; V.M. Sglavo, et al. 31 extra articles. Index.
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Extra info for Fracture Mechanics of Ceramics: Fatigue, Composites, and High-Temperature Behavior
Plenum Press, New York, 19% 45 the crack tip. The third stage stage takes place near the toughness Kx; and leads to fast fracture. Figure (1) shows a typical V-KJ diagram in a log-log scale, where the three stages are present. e for crack rates less than 10-4 mls 2, V can be related to KI by the expression: V=A*K/ (1) where A and n are material properties. KIO is a threshold value under which no propagation occurs. It has sometimes been observed in ceramic materials 4 and is of prime importance in practice because it defines unlimited lifetime for ceramic components.
Hence, failure occurs at a stress 0", for the blunt notch and 0"2 for the sharper notch, respectively. However, considering the Rcurve behavior, the crack may propagate in a stable manner until the tangent criterion of instability ( dK da laPP1 ) a=a. = dK lbr d(Aa) is fulfilled. It becomes obvious that the pronounced R-curve-behavior of material B leads to a significant increase in strength of the sharp notch geometry. The failure stress increases from 0"2 to 0"3. For the blunt notch geometry, the R-curve does not significantly influence the strength because the tangent criterion is satisfied at about the initial crack size ai.
2, (1994). Nonuniform Polyaxial Stresses, 1. App!. Mech" 41, 459-61 (1974). Am. Ceram. , 61 [7-8]355-58 (1978). , 61 [7-8)302-308 (1978) 43 21. 22. 23. 24. 25. 26. 27. JSME, 24, 290-94 (1981). : Influence of the Fracture Criteria on the Failure Prediction of Ceramics Loaded in Biaxial Flexure, 1. Am. Ceram. Soc. 74 , 48-52 (1991). : STAU-ein Programm zur Berechnung der Ausfallwahrscheinlichkeit mehrachsig beanspruchter keramischer Komponenten als PostProzessor fOr Finite-Elemente-Programme, Internal Report, Institute for Reliability and Failure Analysis, University of Karlsruhe, Germany, (1991).