Quantitative Fractographic Analysis of Fracture Origins in Glass

Mecholsky, J. J.

doi:10.1007/978-1-4899-1325-8_2

Cited by 18 publications

(17 citation statements)

References 22 publications

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“…However, since the principles are global, the concepts should also apply to borate glasses, chalcogenide glasses, etc. Table 1 summarizes those energies for four common silicate glasses using the data compiled by Mecholsky [23] and Quinn [8]. The results are quite consistent and revealing as the kinetic energies of the crack system at mirror formation are~70-75% of the total energy required by the crack.…”

Section: Formation Of the Mirror/mist Boundary On The New Fracture Susupporting

confidence: 55%

Glass fracture patterns and the (G,R) vs ∆C diagram

Bradt

2012

Journal of Non-Crystalline Solids

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Section: Formation Of the Mirror/mist Boundary On The New Fracture Susupporting

confidence: 55%

Glass fracture patterns and the (G,R) vs ∆C diagram

Bradt

2012

Journal of Non-Crystalline Solids

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“…The achieved hardness enhancement (H v > 8 GPa) by platelets addition made glass matrix composites suitable for applications requiring good wear resistance. The indentation fracture energy also exhibited a notable increase with increasing platelet content, varying from 6.50 J/m 2 (a typical value for an un-reinforced glass 34 ) up to 26.81 J/m 2 , as shown in Fig. 7.…”

Section: Resultsmentioning

confidence: 79%

Development and mechanical characterization of Al2O3 platelet-reinforced glass matrix composites obtained from glasses coming from dismantled cathode ray tubes

Bernardo

Scarinci

Hreglich

2005

Journal of the European Ceramic Society

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“…For purposes of comparing critical flaw sizes, the size of an equivalent semicircular flaw, c, was calculated using the depth, a, and half width, b, of the semi-elliptical flaw on the fracture surface [38,39].…”

Section: Methodsmentioning

confidence: 99%

Analysis of subcritical crack growth in dental ceramics using fracture mechanics and fractography

Taskonak¹,

Griggs²,

Mecholsky³

et al. 2008

Dental Materials

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Objectives-The aim of this study was to test the hypothesis that the flexural strengths and critical flaw sizes of dental ceramic specimens will be affected by the testing environment and stressing rate even though their fracture toughness values will remain the same.Methods-Ceramic specimens were prepared from an aluminous porcelain (Vitadur Alpha; VITA Zahnfabrik, Bad Säckingen, Germany) and an alumina-zirconia-glass composite (In-Ceram ® Zirconia; VITA Zahnfabrik). Three hundred uniaxial flexure specimens (150 of each material) were fabricated to dimensions of 25 mm × 4 mm × 1.2 mm according to the ISO 6872 standard. Each group of 30 specimens was fractured in water using one of four different target stressing rates ranging on a logarithmic scale from 0.1 to 100 MPa/s for Vitadur Alpha and from 0.01 to 10 MPa/s for InCeram ® Zirconia. The fifth group was tested in inert environment (oil) with a target stressing rate of 100 MPa/s for Vitadur Alpha and 1000 MPa/s for In-Ceram ® Zirconia. The effects of stressing rate and environment on flexural strength, critical flaw size, and fracture toughness were analyzed statistically by Kruskal-Wallis one-way ANOVA on ranks followed by post-hoc comparisons using Dunn's test (α=0.05). In addition, 20 Vitadur Alpha specimens were fabricated with controlled flaws to simplify fractography. Half of these specimens were fracture tested in water and half in oil at a target stressing rate of 100 MPa/s, and the results were compared using Mann-Whitney rank sum tests (α=0.05). A logarithmic regression model was used to determine the fatigue parameters for each material.Results-For each ceramic composition, specimens tested in oil had significantly higher strength (P≤0.05) and smaller critical flaw size (significant for Vitadur Alpha, P≤0.05) than those tested in water but did not have significantly different fracture toughness (P>0.05). Specimens tested at faster stressing rates had significantly higher strength (P≤0.05) but did not have significantly different fracture toughness (P>0.05). Regarding critical flaw size, stressing rate had a significant effect for In-Ceram ® Zirconia specimens (P≤0.05) but not for Vitadur Alpha specimens (P>0.05). Fatigue parameters, n and ln B, were 38.4 and −12.7 for Vitadur Alpha and were 13.1 and 10.4 for InCeram ® Zirconia.Significance-Moisture assisted subcritical crack growth had a more deleterious effect on InCeram ® Zirconia core ceramic than on Vitadur Alpha porcelain. Fracture surface analysis identified

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Quantitative Fractographic Analysis of Fracture Origins in Glass

Cited by 18 publications

References 22 publications

Glass fracture patterns and the (G,R) vs ∆C diagram

Glass fracture patterns and the (G,R) vs ∆C diagram

Development and mechanical characterization of Al2O3 platelet-reinforced glass matrix composites obtained from glasses coming from dismantled cathode ray tubes

Analysis of subcritical crack growth in dental ceramics using fracture mechanics and fractography

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