On the micromechanical failure modes in a class of ideal brittle matrix composites. Part 1. Coated-fiber composites

Pagano, N. J.

doi:10.1016/s1359-8368(97)00002-4

Cited by 47 publications

(19 citation statements)

References 44 publications

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“…The debond was rationalized in terms of the normal stress (parallel to the crack propagation direction) that occurs ahead of a crack tip. Such debonds suggest that similar interface separation can occur ahead of transverse matrix cracks in longitudinally loaded brittle-matrix composites, which is consistent with the mechanism that was derived from energy principles in Pagano 9 for the Sigma SiC/7040 glass system.…”

Section: Discussionsupporting

confidence: 85%

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Evaluation of the Tensile Interface Strength in Brittle‐Matrix Composite Systems

Majumdar

Gundel²,

Dutton

et al. 1998

Journal of the American Ceramic Society

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Two test methods for determining the tensile (normal) interface bond strength in brittle-matrix composites have been described: one geometry is the cruciform bend specimen, and the other is the embedded fiber specimen. Both specimens have the characteristic that free edge debonding is avoided, so that valid interface strength data can be obtained from the knee in the stress-strain curve. The techniques are applied to a Sigma SiC/7040 glass composite, and a bond strength of ∼5 MPa has been obtained. The method of analysis is described. Normal interface separation has been observed at or very close to the SiC/carbon (primarily graphite) interface of the Sigma fiber and is consistent with the weak orientation of the graphitic layers. Two examples of interface separation are cited in the asfabricated composite, to show the application and validation of the test results. In one instance, tensile interface separation has been observed next to existing voids, and in the other instance, interface separation has occurred near radial matrix cracks. Analyses show that the debonds are consistent with the low normal strength of the interface.

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Section: Discussionsupporting

confidence: 85%

“…Polished specimens were examined using optical microscopy and scanning electron microscopy (SEM) techniques. The constituent properties of the composite, obtained from Pagano and co-workers, 8,9 are listed in Table I. Figure 2 shows the cruciform geometry used for the investigation.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Evaluation of the Tensile Interface Strength in Brittle‐Matrix Composite Systems

Majumdar

Gundel²,

Dutton

et al. 1998

Journal of the American Ceramic Society

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“…However, determining a d /a p ratio by direct observation or theoretical estimation of the ÔtypicalÕ defect sizes would be in practice very difficult, if not impossible [10]. Further, when ÔobservableÕ defects exist especially in the interface (or interlayer), it is more likely that another crack deflection mechanism -debonding of the interface ahead of the primary crack before the latter reaches the interface -operates as experimentally observed [28,29] and theoretically predicted [30,31]. Crack deflection through a competition-induced mechanism seems to be possible when interface is defect-free, which was the case in model rubber laminate systems as described below.…”

Section: Comparison With Experimental Observationsmentioning

confidence: 98%

Reconsideration of crack deflection at planar interfaces in layered systems

Lee

Yoo

Shin

2004

Composites Science and Technology

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“…1: (a) after the crack reaches the interface, it kinks out of its original path and continues to propagate along the interface. This phenomenon is often called ''crack kinking or deflection'' (Martinez and Gupta, 1994;Prakash et al, 1995;Kerans and Parthasarathy, 1999;Davis et al, 2000;Leguillon et al, 2001); (b) the crack penetrates the interface and continues to propagate along its original path, i.e., crack penetration (He et al, 2000;Roham et al, 2004); (c) early interface debonding initiates before the incident crack reaches the interface, or it refers to the ''Cook-Gordon mechanism'' (Cook and Gordon, 1964;Lee et al, 1996;Warrier et al, 1997;Majumdar et al, 1998;Pagano, 1998;Leguillon et al, 2000;Korsunsky, 2001;Barber et al, 2002;. In the open literature, efforts have been primarily focused on 0020-7683/$ -see front matter Ó 2006 Elsevier Ltd. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Dynamic interfacial debonding initiation induced by an incident crack

Wang

2006

International Journal of Solids and Structures

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When a crack propagates towards a weak interface, interface debonding may occur before the incident crack reaches the interface. This phenomenon refers to the ''Cook-Gordon mechanism''. In this investigation, an equivalent dynamic CookGordon mechanism is studied both experimentally and analytically. Two strength-based criteria incorporating dynamic fracture mechanics analysis are proposed to predict the initiation location of interface debonding ahead of a dynamic incident crack. As validation, a comparison is made between the analytical predictions and experimental measurements. Results show that the strength-based criteria can effectively predict the initiation of interface debonding. Meanwhile, effects of the stress intensity factor and the T stress of the incident crack, on the interfacial debonding initiation are investigated. It is concluded that high-stress intensity factors of the incident cracks will easily induce interfacial debonding initiation, and changing the T stress is an effective way to control interfacial debonding initiation. Furthermore, high-interfacial tensile strengths rather than shear strengths, tend to suppress interfacial debonding initiation induced by a mode-I incident crack.

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On the micromechanical failure modes in a class of ideal brittle matrix composites. Part 1. Coated-fiber composites

Cited by 47 publications

References 44 publications

Evaluation of the Tensile Interface Strength in Brittle‐Matrix Composite Systems

Evaluation of the Tensile Interface Strength in Brittle‐Matrix Composite Systems

Reconsideration of crack deflection at planar interfaces in layered systems

Dynamic interfacial debonding initiation induced by an incident crack

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