Crack front pinning by design in planar heterogeneous interfaces

Dalmas, Davy; Barthel, Étienne; Vandembroucq, Damien

doi:10.1016/j.jmps.2008.11.012

Cited by 52 publications

(38 citation statements)

References 29 publications

(37 reference statements)

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“…These include pull-off and peel tests(tape tests [21]), scratch testing [22][23][24][25], four point bend tests [26,27], stressed overlayers [28][29][30] , indentation tests [24,[31][32][33], laser spallation tests [34,35], double cantilever beam tests [36,37] and microcantilever deflection etc. We will start with brief review of the most common techniques before going into more detail about the indentation and scratch tests which are often the only available tests for thin hard coatings.…”

Section: Techniques To Assess Interfacial Toughnessmentioning

confidence: 99%

“…It works well for relatively thick coatings; however, it is difficult to apply to thin films because it is hard to create a suitable precrack (as for other bend tests) and the bonding of the rigid plates may damage the interfaces to be tested. However, recently this approach has been successfully applied to very thin multilayer oxide coatings on glass where the thickness of each individual layer is below 50nm [36,37,47]. …”

Section: Double Cantilever Beam Testmentioning

confidence: 99%

“…Recall that the delamination generated during unloading is caused by the tensile stress generated when elastic recovery is hindered by the presence of the plastic deformation zone beneath the indenter which is similar to the formation of lateral cracking around indentations in a bulk ceramic material. A method developed based on the expanding spherical cavity model to determine the toughness based on stress analysis of the lateral cracking process in bulk materials [36] gives …”

Section: Delamination Induced During Unloadingmentioning

confidence: 99%

See 2 more Smart Citations

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Chen¹,

Bull²

2010

J. Phys. D: Appl. Phys.

121

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The fundamental property which often dictates the performance of a coating is its adhesion to the substrate and thus there are many techniques to measure adhesion. The choice of methods is dependent on many factors such as the mechanical properties of the coating and substrate, the interface properties, the microstructure of the coating/substrate system, residual stress, coating thickness and the intended application. Most tests aim to introduce a stable interfacial crack and make it propagate under controlled conditions and model this process to determine adhesion. The corresponding models are either stress analysis-based or energy-based. With the advent of miniature systems and very thin functional coatings, there is a need for characterization of adhesion at small length scales and some specific tests have been developed which are not appropriate for thicker coatings. Among these, indentation and scratch methods have the widest range of applicability but it is necessary to analyse the failure mechanisms before choosing an appropriate model to extract adhesion parameters. This paper reviews the main quantitative adhesion tests for coatings and highlights the tests which can be used to assess submicrometre coatings and thin films. The paper also highlights the modelling and analysis methods necessary to extract reliable adhesion properties illustrating this with examples for submicrometre coatings on silicon and architectural glass.

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Section: Techniques To Assess Interfacial Toughnessmentioning

confidence: 99%

Section: Double Cantilever Beam Testmentioning

confidence: 99%

Section: Delamination Induced During Unloadingmentioning

confidence: 99%

See 1 more Smart Citation

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Chen¹,

Bull²

2010

J. Phys. D: Appl. Phys.

121

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“…The set-up we have developed enables us to propagate and monitor planar crack in transparent samples with a patterned interface by using a DCB cleavage test (Double Cleavage Beam) [8,9]. The main advantages of this set-up are:…”

Section: Methodsmentioning

confidence: 99%

Direct observation and analysis of crack front morphology during crack pinning by heterogeneous interface

Dalmas

Vandembroucq²

2010

EPJ Web of Conferences

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Abstract. Adhesion of thin film multilayers deposited on glass is a crucial issue for many industrial applications. Thus, it becomes of great interest to measure and also to increase the adhesion. Many mechanisms of toughening a brittle solid can be found in literature; but few of them can be applied to thin film layer. By introducing a heterogeneous interfacial toughness field, it should be possible to increase adhesion. This toughness modification would be the consequence of the existence of a pinning regime due to a local change of the toughness. To experimentally validate this new approach of adhesion modification, we investigate the crack front pinning by performing cleavage tests on multilayer coated samples with a heterogeneous interfacial toughness. We have tested different patterns of pinning region. The crack front morphology was nicely described in the framework of the perturbative approach initially developed by Gao and Rice and allowed us to determine the local value of the energy release rate (~adhesion).

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“…In this case, the knowledge of the normal vectors, related to the angles of tangents, can be needed for a flux computation. In fracture mechanics, it may be useful to determine the equation of the decohesion front [13]. In image processing, angles and curvatures are parameters permitting to compare different shapes [14].…”

Section: Introductionmentioning

confidence: 99%

Accurate measurement of curvilinear shapes by Virtual Image Correlation

Semin

Auradou

François

2011

Eur. Phys. J. Appl. Phys.

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Abstract. The proposed method allows the detection and the measurement, in the sense of metrology, of smooth elongated curvilinear shapes. Such measurements are required in many fields of physics, for example: mechanical engineering, biology or medicine (deflection of beams, fibers or filaments), fluid mechanics or chemistry (detection of fronts). Contrary to actual methods, the result is given in an analytical form of class C ∞ (and not a finite set of locations or pixels) thus curvatures and slopes, often of great interest in science, are given with good confidence. The proposed Virtual Image Correlation (VIC) method uses a virtual beam, an image which consists in a lateral expansion of the curve with a bell-shaped gray level. This figure is deformed until it fits the best the physical image with a method issued from the Digital Image Correlation method in use in solid mechanics. The precision of the identification is studied in a benchmark and successfully compared to two state of the art methods. Three practical examples are given: a bar bending under its own weight, a thin fiber transported by a flow within a fracture and a thermal front. The first allows a comparison with theoretical solution, the second shows the ability of the method to deal with complex shapes and crossings and the third deals with ill-defined image.

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Crack front pinning by design in planar heterogeneous interfaces

Cited by 52 publications

References 29 publications

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Approaches to investigate delamination and interfacial toughness in coated systems: an overview

Direct observation and analysis of crack front morphology during crack pinning by heterogeneous interface

Accurate measurement of curvilinear shapes by Virtual Image Correlation

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