Mechanical failure of thin brittle coatings

Strawbridge, A.; Evans, Hugh E.

doi:10.1016/1350-6307(95)00014-h

Cited by 70 publications

(31 citation statements)

References 50 publications

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“…18) at the edge of cracks is very high [76]. This effect becomes stronger for the case of relatively stiffer films compared to the substrate [77]. Stiffer films account for larger crack spacing for a given mismatch stress.…”

Section: Surface Cracking and Crack Channelling In Filmmentioning

confidence: 99%

A review of theoretical analysis techniques for cracking and corrosive degradation of film-substrate systems

Nazir

Khan

2017

Engineering Failure Analysis

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This paper contains a review of the most vital concepts regarding the analysis and design of film systems. Various techniques have been presented to analyse and predict the failure of films for all common types of failure: fracture, delamination, general yield, cathodic blistering, erosive and corrosive wear in both organic and inorganic films. Interfacial fracture or delamination is the loss of bonding strength of film from substrate, and is normally analysed based on the fracture mechanics concepts of bi-material systems. Therefore, keeping the focus of this review on bonding strength, the emphasis will be on the interfacial cracking of films and the corresponding stresses responsible for driving the delamination process. The bi-material characteristics of film systems make the nature of interfacial cracks as mixed mode, with cracks exhibiting various complex patterns such as telephone cord blisters. Such interfacial fracture phenomenon has been widely studied by using fracture mechanics based applicable analysis to model and predict the fracture strength of interface in film systems. The incorporation of interfacial fracture mechanics concepts with the thermodynamics/diffusion concepts further leads to the development of corrosive degradation theories of film systems such as cathodic blistering. This review presents the suggestions for improvements in existing analysis techniques to overcome some of the limitations in film failure modelling. This comprehensive review will help researchers, scientists, and academics to understand, develop and improve the existing models and methods of film-substrate systems.

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Section: Surface Cracking and Crack Channelling In Filmmentioning

confidence: 99%

A review of theoretical analysis techniques for cracking and corrosive degradation of film-substrate systems

Nazir

Khan

2017

Engineering Failure Analysis

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“…Particular criteria are favourable for certain types of materials. In this study the maximum principal strain criterion (Chai and Chiang, 1996;Strawbridge and Evans, 1995) was employed for the MMC as well as the aircraft coating system to determine crack initiation and propagation, that is, a crack will initiate or an existing crack will propagate when the maximum strain at the crack tip exceeds the strain-at-break εb of the material. The maximum principal stress criterion (Maiti and Smith, 1983) was employed for these two types of materials to determine the crack propagation direction.…”

Section: Initiation and Propagation Criteriamentioning

confidence: 99%

Application of augmented finite element and cohesive zone modelling to predict damage evolution in metal matrix composites and aircraft coatings

Han¹,

Veidt²,

Reiner³

et al. 2016

J. Mech. Eng. Res.

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This paper reports on the application of a special purpose finite element analysis tool that combines augmented finite element methodologies (AFEM) and cohesive zone model (CZM) methods to simulate initiation and propagation of both cohesive and adhesive cracks. The constitutive behaviour of an aluminium/silicon carbide metal matrix composite was predicted and compared with experimental data as an example of a material system controlled by cohesive cracks. The simulation allowed to determine the strain level, at which particle fracture was initiated and illustrates how the overall material response is dominated by particle fracture beyond that strain level. The effects of silica filler particles on the lifetime of polyurethane matrix aircraft coating systems were investigated in a second example in which adhesive cracks at the filler/matrix interface are a dominant failure mechanism. The influence of particle volume fraction and particle/matrix interface adhesion strength on coating lifetime predictions were investigated and the results show that low filler particle volume fraction and high interface adhesion strength improve coating durability. In general, the paper demonstrates the potential of combined AFEM and CZM micromechanical damage simulation to gain improved understanding of damage mechanisms in heterogeneous materials and to support analysis and design of advanced material systems.

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“…The degradation process of hard coatings is strongly depended on the temperature. At low temperatures hard coatings deform via shearing along grain boundaries [9,10]. At higher temperatures, when the temperature exceeds 0.5 T/Tm, where T-temperature of deformation, Tm-melting temperature, creep process influences the deformation of hard coatings [10].…”

Section: Fraction Degradationmentioning

confidence: 99%

Cavitation degradation model of hard thin pvd coatings

Krella¹

2010

Advances in Materials Sciences

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A cavitation degradation process and fatigue phenomenon were described. Similarly to fatigue phenomenon, cavitation pulses division into three fractions was suggested. The action of each fraction was respectively compared to low-cycle fatigue, high-cycle fatigue and low-amplitude fatigue. The action of each fraction was described separately. Detailed analysis of the influence of each fraction on the degradation process shows that besides mechanical loading also thermal loading occurs. The cavitation erosion is assumed to be the sum of degradation of each fraction. Thus, the model of PVD coatings degradation under action of cavitation pulses include variable-amplitude and variable-temperature fatigue.

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Mechanical failure of thin brittle coatings

Cited by 70 publications

References 50 publications

A review of theoretical analysis techniques for cracking and corrosive degradation of film-substrate systems

A review of theoretical analysis techniques for cracking and corrosive degradation of film-substrate systems

Application of augmented finite element and cohesive zone modelling to predict damage evolution in metal matrix composites and aircraft coatings

Cavitation degradation model of hard thin pvd coatings

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