Effect of crack face contact and friction on Brazilian disk specimens—A finite difference solution

Dorogoy, A.; Banks‐Sills, Leslie

doi:10.1016/j.engfracmech.2005.05.005

Cited by 39 publications

(33 citation statements)

References 19 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%

“…Table A2 with similar results (1) calculated by making use of closed form solutions given by Atkinson et al 11 and Yarema et al, 37 (2) curve fitted by Eftekhari et al 25 and (3) due to others found in the literature. 22,24 Generally, good agreement is found. With a further increase in θ beyond θ O the number of nodal pairs in contact increases successively from the crack tip towards the crack centre.…”

Section: Resultsmentioning

confidence: 75%

“…Different methodologies exist in the literature to analyse diametrically compressed homogeneous isotropic Brazilian discs with inclined central cracks for the evaluation of their mixed mode K I and K II values. [9][10][11][19][20][21][22][23][24][25] Table 1 lists some researchers with the scope of their relevant researches in terms of the used methodology and the analysed relative crack length, a/R, θ and friction coefficient, μ. Here, R is the disc radius.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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%

Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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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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“…Friction is also a concern in this test. 20 (2) Specimens with a Coating Layer For all of the tests discussed above, the effect of the elastic mismatch of the coating layer on the mode mix of the interface crack can be estimated simply if the coating is thin compared with the thickness of the substrate and the stiffener. The delamination crack lies on the interface between the coating and the substrate.…”

Section: Potential Tests For a Full Range Of Mixed Mode Delaminatmentioning

confidence: 99%

Lifetime Assessment for Thermal Barrier Coatings: Tests for Measuring Mixed Mode Delamination Toughness

Hutchinson

2011

J. Am. Ceram. Soc.

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Mechanisms leading to degradation of the adherence of thermal barrier coatings (TBC) used in aircraft and power generating turbines are numerous and complex. To date, robust methods for the lifetime assessment of coatings have not emerged based on predictions of the degradation processes due to their complexity. In the absence of mechanism-based predictive models, direct measurement of coating adherence as a function of thermal exposure must be a component of any practical approach toward lifetime assessment. This paper outlines an approach to lifetime assessment of TBC that has taken shape in the past few years. Most TBC delaminations occur under a mix of mode I and mode II cracking conditions, with mode II delamination being particularly relevant. Direct measurement of TBC delamination toughness has been challenging, but recent progress has made this feasible. This paper surveys a range of potentially promising tests for measuring the mode dependence of delamination toughness with particular emphasis on toughness under mode II conditions.

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“…coating or lamina thickness), because it violates the presumption that the fracture process zone is controlled entirely by asymptotic fields and that toughness is independent of specimen geometry. While there have been insightful computational studies on the role of frictional sliding in altering crack-tip stress intensity factors [25,26], a consistent theory that quantifies mixed-mode toughness in terms of friction parameters is yet to emerge. This work is entirely consistent with previous studies of mixed-mode fracture, in the sense that it is recognized that friction will alter the conditions required to debond the interface.…”

mentioning

confidence: 99%

Detachment of compliant films adhered to stiff substrates via van der Waals interactions: role of frictional sliding during peeling

Collino

Philips

Rossol

et al. 2014

J. R. Soc. Interface.

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The remarkable ability of some plants and animals to cling strongly to substrates despite relatively weak interfacial bonds has important implications for the development of synthetic adhesives. Here, we examine the origins of large detachment forces using a thin elastomer tape adhered to a glass slide via van der Waals interactions, which serves as a model system for geckos, mussels and ivy. The forces required for peeling of the tape are shown to be a strong function of the angle of peeling, which is a consequence of frictional sliding at the edge of attachment that serves to dissipate energy that would otherwise drive detachment. Experiments and theory demonstrate that proper accounting for frictional sliding leads to an inferred work of adhesion of only approximately 0.5 J m 22 (defined for purely normal separations) for all load orientations. This starkly contrasts with the interface energies inferred using conventional interface fracture models that assume pure sticking behaviour, which are considerably larger and shown to depend not only on the mode-mixity, but also on the magnitude of the mode-I stress intensity factor. The implications for developing frameworks to predict detachment forces in the presence of interface sliding are briefly discussed.

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Effect of crack face contact and friction on Brazilian disk specimens—A finite difference solution

Cited by 39 publications

References 19 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

Lifetime Assessment for Thermal Barrier Coatings: Tests for Measuring Mixed Mode Delamination Toughness

Detachment of compliant films adhered to stiff substrates via van der Waals interactions: role of frictional sliding during peeling

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