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TECHNICAL PAPERS

Fracture Toughness Testing on Bars Under Opposite Cylinder Loading

[+] Author and Article Information
T. Fett, D. Munz, G. Thun

Forschungszentrum Karlsruhe, Institut fur Materialforschung II, Postfach 3640, D-76021 Karlsruhe, Germany

J. Eng. Gas Turbines Power 126(1), 50-54 (Mar 02, 2004) (5 pages) doi:10.1115/1.1639003 History: Received December 01, 2001; Revised March 01, 2002; Online March 02, 2004
Copyright © 2004 by ASME
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References

Warren,  R., and Johannesson,  B., 1984, “Creation of Stable Cracks in Hard Metals Using ‘Bridge’ Indentation,” Powder Metall., 27, pp. 25–29.
Nose,  T., and Fujii,  T., 1988, “Evaluation of Fracture Toughness for Ceramic Materials by a Single-Edge-Precracked-Beam Method,” J. Am. Ceram. Soc., 71, pp. 328–333.
Filon,  L. N. G., 1903, “On an Approximate Solution for the Bending of a Beam of Rectangular Cross-Section Under any System of Load, With Special Reference to Points of Concentrated or Discontinuous Loading,” Philos. Trans. R. Soc. London, Ser. A, 201, pp. 63–155.
Fett,  T., Munz,  D., and Thun,  G., 2001, “A Toughness Test Device With Opposite Roller Loading,” Eng. Fract. Mech., 68, pp. 29–38.
Fett, T., and Munz, D., 1997, Stress Intensity Factors and Weight Functions, Computational Mechanics Publications, Southampton, UK.
Nishida,  T., Pezzotti,  G., Mangialardi,  T., and Paolini,  A. E., 1996, “Fracture Mechanics Evaluation of Ceramics by Stable Crack Propagation in Bend Bar Specimens,” Fract. Mech. Ceram., 11, pp. 107–114.
Kübler,  J., 1997, “Fracture Toughness Using the SEVNB Method: Preliminary Results,” Ceram. Eng. Sci. Proc., 18, pp. 155–162.
Fett,  T., Glazounov,  A., Hoffmann,  M. J., Munz,  D., and Thun,  G., 2001, “On the Interpretation of Different R-Curves for Soft PZT,” Eng. Fract. Mech., 68, pp. 1207–1218.
Munz, D., and Fett, T., 1999, CERAMICS, Failure, Material Selection, Design, Springer-Verlag, Heidelberg.
Lucato,  S. L., Lupascu,  D. C., and Rödel,  J., 2000, “Effect of Poling Direction on R-Curve Behavior in PZT,” J. Am. Ceram. Soc., 83, pp. 424–426.
Glazounov,  A. E., Fett,  T., Reszat,  J. T., Hoffmann,  M. J., Munz,  D., and Wroblewski,  T., 2001, “Influence of Domain Switching State on R-Curves Interpreted by Using X-Ray Diffraction Study,” J. Mater. Sci. Lett., 20, pp. 877–880.

Figures

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Controlled fracture test device with force application via four symmetrical rollers
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Axial stresses, σx, along the symmetry line x=0 for two pairs of concentrated opposite forces
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(a) Geometric function YI according to Eq. (4); (b) biaxiality ratio β for d/W=1
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Crack growth under increasing load; (a) initial crack size a0<am, (b) a0=am (d/W=1)
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Device for a four-roller crack extension test
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(a) Fractured test specimen, (b) crack resistance KR (R-curve) for unpoled PZT PIC 151 as a function of crack extension (dashed curve: result from controlled bending test, 8), (c) ⊥-poled specimens
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(a) Crack extension as a function of the stress σ* , (b) R-curve for alumina with 4% glass content
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Comparison of R-curves for poled and ⊥-poled PIC 151 measured with different specimens (results with CT-specimens from Lucato et al. 10)
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σx-stresses for several relative crack depths a/W (KI=1 MPa√m). Solid parts of curves: region of crack propagation, dashed parts: region of the initial notch 8.

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