Geometric description of fracture surface features in isotropic brittle solids

Dugnani, Roberto; Zednik, Ricardo J.

doi:10.1016/j.engfracmech.2016.08.013

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…In particular, the mirror-mist boundary shape near the free surface for samples fractured in bending was expected to follow an elliptical curve for values of , a parabolic curve for , and a hyperbolic curve for values of . The shape of the mirror-mist boundary region for the soda-lime glass samples fractured in this work appeared to follow the trends described by the work of Dugnani and Zednik [12]. Fig.…”

Section: Icmaa 2018supporting

confidence: 62%

“…analysis conducted by Dugnani and Zednik [12]. Dugnani and Zednik indicated that the geometric shape of the mirror-mist boundary for a brittle sample fractured in either tension or bending could be described by the equation of a conic section.…”

Section: Icmaa 2018mentioning

confidence: 99%

“…Also Fig. 3(a) shows a contour of the corresponding expected mirror-mist boundary shape for various values of based on the theoretical work of Dugnai and Zednik [12]. With these premises, an efficient computational algorithm to obtain the mirror-mist boundary could be developed.…”

Section: Icmaa 2018mentioning

confidence: 99%

“…(2) One of the premises of this method was the shape of the mirror-mist boundaries followed a conic relation. This work conducted by Dugnani and Zednik [12] was based on the straight crack solution for the crack propagation. A more appropriate dynamic model should be implemented to better explain the loci of the mirror-mist boundaries.…”

Section: Future Workmentioning

confidence: 99%

“…5c) was regressed through the points corresponding to the surface roughness in the range of interest. The type of conic section equation used to regress the data was determined based on the value of , as explained in Dugnani and Zednik [12]. The curve obtained from the initial data regression (white, Fig.…”

Section: Icmaa 2018mentioning

confidence: 99%

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Improved Fractographic Strength Estimates Based on Surface Profilometry

Dugnani

2018

MATEC Web of Conferences

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Abstract. Fractography is a valuable method that uses post-mortem topographical information to estimate the stress field near the fracture origin and help establish the root cause of failures. Typically, in glass and ceramics the mirror radius is one of the features sought for by fractographers since its length could be empirically related to the sample's strength. The mirror radius is usually subjectively estimated by fractographers though microscopy measurements. Nonetheless, variations in the estimates introduced by inconsistent viewing modes and the subjectivity of observers could lead to substantial errors even when standard protocols such as ASTM C1678 were followed. In this manuscript, a novel method combining a fracture mechanics model describing the mist formation in silicate glasses with profilometry data carried out by confocal laser scanning microscope is introduced. The new method was shown to be able to objectively establish the mirror-mist boundary. Furthermore, it was found that the proposed technique was repeatable within 2% regardless of the magnification or imaging mode used. Whereas the average strength estimated per ASTM C1678 by eight individual observers was influenced by both the magnification and the imaging mode used and displayed standard deviation of over 3%.

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Section: Icmaa 2018supporting

confidence: 62%

Section: Icmaa 2018mentioning

confidence: 99%

Section: Icmaa 2018mentioning

confidence: 99%

Section: Future Workmentioning

confidence: 99%

Section: Icmaa 2018mentioning

confidence: 99%

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