Crack development in a sintered carbide in combined deformation of types I and II

Yarema, S. Ya.; Ivanitskaya, G. S.; Maistrenko, A. L.; Zboromirskii, A. I.

doi:10.1007/bf01530284

Cited by 18 publications

(15 citation statements)

References 5 publications

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“…For small crack lengths, ie, a/R ≤ 0.4, at the same angle, Y I increases with increasing a/R for θ ≤ 17° followed by a reverse trend for θ > 17 o . For validation, the present results are compared in Table with similar results (1) calculated by making use of closed form solutions given by Atkinson et al and Yarema et al, (2) curve fitted by Eftekhari et al and (3) due to others found in the literature . Generally, good agreement is found.…”

Section: Resultssupporting

confidence: 61%

Modes I/II SIF of a diametrically compressed Brazilian disc having a central inclined crack with frictional surfaces

Hammouda

Fayed

2017

Fatigue Fract Eng Mat Struct

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An in‐house finite element code was used to analyse a diametrically compressed isotropic homogeneous Brazilian disc having a central inclined crack with frictional surfaces for the evaluation of its corresponding modes I and II stress intensity factor (SIF). One‐half of the disc was successfully idealized. The coefficient of friction between the crack surfaces ranged from 0 to 1 in steps of 0.1. Relative crack length ratios of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, and 0.7 were analysed with crack angles up to 90° in steps of 5°. The crack angle corresponding to the transition from a mixed mode I/II to a pure mode II decreases with increasing the relative crack length ratio. An increase in the relative crack length ratio leads to an increase in the range of crack angles corresponding to a partially closed crack. The crack angle at which fully closed sliding crack surfaces commences is 30° independent of the relative crack length ratio and the friction coefficient. With the same relative crack length ratio and increasing the friction coefficient, there is a corresponding decrease in the crack angle for the maximum mode II SIF. With a decrease in the relative crack length ratio or the friction coefficient, the crack angle beyond which the crack surfaces become in a fully sticking mode decreases resulting in zero mode II SIF. Generally, mode II SIF decreases with increasing the friction coefficient between the crack surfaces. Good agreement has been generally obtained with relevant results found in the literature.

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Section: Resultssupporting

confidence: 61%

Modes I/II SIF of a diametrically compressed Brazilian disc having a central inclined crack with frictional surfaces

Hammouda

Fayed

2017

Fatigue Fract Eng Mat Struct

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“…10). Moreover, the average grain size for sintered carbide (WC/Co) reported by Yarema et al 23 is about 2.14 μm that is about 0.01 of r c =0.2 mm, which was calculated from and written in Table II for the sintered carbide. Therefore, the following empirical relation can be suggested for estimating the size of r c in the tested ceramics …”

Section: Resultsmentioning

confidence: 93%

“… Predictions of generalized maximum tangential stress (GMTS) criterion for mixed mode fracture in sintered carbide (WC/Co) tested by Yarema et al 23 using the Brazilian disk specimen. …”

Section: Resultsmentioning

confidence: 99%

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Fracture Analysis of Some Ceramics Under Mixed Mode Loading

Ayatollahi

Aliha

2010

Journal of the American Ceramic Society

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Mixed mode fracture resistance was analyzed for some previously tested ceramics using a three‐parameter fracture criterion called the generalized maximum tangential stress (GMTS) criterion. For using this fracture criterion, the size of a critical distance from the crack tip was required. Therefore, an analytical model was suggested for determining the size of critical distance in terms of mode I fracture toughness and the tensile strength of ceramics. For some ceramics with reported grain size, the size of critical distance was found to be approximately 100 times the average grain size. The experimental results obtained from the cracked Brazilian disk specimen and reported in the literature for sialon, mullite, SiC, glass, sintered carbide, porcelain, zirconia, and alumina could be estimated very well when the GMTS fracture criterion was used.

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“…However, during a crack growth, the above‐mentioned geometric factor could be varied from an initial value φ 0 to a running value φ i (lower or higher). For mode I‐oriented oblong crack in a circular disc, ϕ is given by an expression of the type [23]: …”

Section: A Fracture Mechanics Approachmentioning

confidence: 99%

The Identification of a Hidden Long‐Term Plastic Damage Stage During Splitting Tensile Loading of Concrete: A Fracture Mechanics Approach

Pandermarakis

Sotiropoulou

2010

Strain

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A new method for the determination of fracture toughness KIC, fracture energy GF and critical crack tip opening displacement CTODc of mortars and concretes with maximum size of aggregates up to 8 mm is presented. This was achieved by using a suitable modification of the conventional splitting tensile test. The values that were obtained are in accordance with those of other researchers. On the basis a clear‐cut fracture mechanics analysis, we extract a set of equations that correlates the above quantities with the crack rate. Specific plastic damage stages that accompany the crack growth were thus easily identified. A pre‐peak damage process of a characteristic bandwidth of 0.1–1 μm and length from a few micrometres to a few millimetres appears first. Damage process of this kind can be diffused and dispersed in bulk of the loading component or it can also be localised and formed into an active attractor cracking path through its chain accumulation. Then another damage stage, coming directly through the formation of the well‐known fracture process zone near the crack tip of 10 μm in bandwidth and a few tens of millimetres in length, must be added. Finally, a large‐scale stage involving the influences of composition and texture of stressed components as well as their loading and geometry conditions must be superimposed on the first two. This third damage process comes directly through the reordering and redistribution of the aforementioned features, during the evolution of fracture, giving an effective length that varies from few tens of millimetres to some metres. All these effective lengths could easily be extracted from the calculated concrete fracture quantities.

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Crack development in a sintered carbide in combined deformation of types I and II

Cited by 18 publications

References 5 publications

Modes I/II SIF of a diametrically compressed Brazilian disc having a central inclined crack with frictional surfaces

Modes I/II SIF of a diametrically compressed Brazilian disc having a central inclined crack with frictional surfaces

Fracture Analysis of Some Ceramics Under Mixed Mode Loading

The Identification of a Hidden Long‐Term Plastic Damage Stage During Splitting Tensile Loading of Concrete: A Fracture Mechanics Approach

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