Fracture Resistance of Ceramics upon Edge Chipping

Gogotsi, G. A.; Mudrik, S. P.

doi:10.1023/b:stom.0000048406.95349.ca

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…4a), which exhibits a certain scatter in data (as a similar diagram [16]). To clarify this phenomenon, the correspondence of data distribation to the normal law was examined, the latter being the basis for the linear regression analysis [ (Fig.…”

Section: изучено сопротивление разруш ению макрооднородных линейно-упmentioning

confidence: 99%

“…As earlier [15,16], the single-edge V-notched beam (SEVNB) method was used to determine the critical stress intensity factor K ic with the flexure of a V-notched rectangular beam. This method is suitable for testing different ceramics, it provides reliable experimental data based on a limited number of tests [2,5].…”

Section: изучено сопротивление разруш ению макрооднородных линейно-упmentioning

confidence: 99%

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Fracture Resistance of Ceramics: Edge Fracture Method

et al. 2005

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Ключевые слова: керамика, скалывание кромки, краевая вязкость разру шения, индентирование.Introduction. Ceramics are widely used in industry, medicine, and everyday life. Being brittle materials, they can undergo catastrophic failure in operation, e.g., even first efforts to manufacture ceramic gas-turbine blades have revealed this critical tendency [1]. An increased sensitivity to stress concentrations and low resistance of the edges to flaking, which can account for uncontrolled failure, also cause certain concern.With an improvement in the characteristics of ceramics and a continuous growth in production volumes of ceramic items, fracture resistance of these materials attracts the particular attention

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Section: изучено сопротивление разруш ению макрооднородных линейно-упmentioning

confidence: 99%

Section: изучено сопротивление разруш ению макрооднородных линейно-упmentioning

confidence: 99%

Fracture Resistance of Ceramics: Edge Fracture Method

et al. 2005

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“…flexure (ratio of the area under the load-flexure diagram to the fracture surface area of the specimen) [26] as well as by the test method based on flaking off the specimen edges [10] ( Table 2). The latter is based on that the ratio of the load that induced the flaking-off of the rectangular specimen edge to any size of the chip scar does not depend on the magnitude of this load applied with the Rockwell indenter [27] (validity of this ratio was confirmed by the Vickers and Knoop indentations [28][29][30]). For a method [10], which can be considered a prototype of the method used in our investigations [29,31], one should employ a special test machine with a traveling microscope that provides accurate choice of the indentation point on the surface of the specimen.…”

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confidence: 99%

“…The specimens were first tested for fracture toughness by the SEVNB method [35], then their fragments were used as specimens for EF tests. The flaking resistance of ceramics was studied by a procedure approved in [30,31]. The procedure consists in choosing the point located near the specimen edge and flaking off this edge with the standard Rockwell monocrystalline diamond indenter 3) , the load applied to it was registered with a computer.…”

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confidence: 99%

Fracture resistance of ceramics: Base diagram and R-line

Gogotsi

2006

Strength Mater

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539.4Modern methods of determining crack resistance of ceramics are analyzed and it is shown that fracture of the specimens can be divided into the three stages: formation of a stress concentrator, nucleation and propagation of a crack. Note that standard methods provide determining at the second and third stages but the EF method effects measurements at all the three stages, with testing small-size specimens. The flaking resistance F R was estimated by the Rockwell indentation of the specimens of oxide and nonoxide linear elastic and inelastic ceramics as well as particulate ceramic composites. It was established that F R values for homogeneous linear elastic ceramics were invariant (independent of flaking loads and chip scar sizes). It was demonstrated on the flaking resistance-critical stress intensity factor diagram that the values for ceramics with enhanced damage resistance were found to the left of the base line, while those of homogeneous linear elastic ceramics fell on this line. The values for ceramics with enhanced crack propagation resistance are to the right of this line. Crack propagation resistance diagrams (R-lines) are proposed, they are similar to known R-curves but they are plotted on the basis of results obtained with flaking off the edges of ceramic specimens. For homogeneous linear elastic ceramics these lines are flat, which is indicative of their surface energy invariance.

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“…This conclusion was made also by the authors in [13]. Therefore in [17] development of a new method for determining ceramic resistance to breaking was started and continued in [6], that in [18] was called the EF (edge fracture) method.…”

Section: Introductionmentioning

confidence: 87%