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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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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