Indentation and microcutting fracture damage in a silicon carbide coating on an Incoloy substrate

Tanikella, B. V.; Gruss, Kimberly Ann; Davis, R. F.; Scattergood, R.O.

doi:10.1016/s0257-8972(96)02910-6

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…Vickers indentation may not always produce typical cracking (e.g. corner radial or lateral cracks) in certain thin film as reported by Tanikella et al 142 and Yonezu et al, 144,145 and this could be due to the applied load less than the threshold or critical load value. However, Tanikella et al 142 observed a reproducible AE signal which did not vary with loading rate which occurred at the fracture threshold in thin amorphous SiC coatings deposited on an Incoloy substrate (Fig.…”

Section: Vickers Indentersmentioning

confidence: 85%

“…Unlike the AE monitoring of bulk ceramics and metals, the cracking mechanism in overlay coatings is dependent on the adhesive nature as well as microstructures of thin layer and substrate. AE response during indentation of thin films has indicated that it is dominated by the 'high intensity AE peaks' due to a number of failure modes such as film cracking 96,110,[141][142][143][144][145][146][147][148][149][150][151] and delamination 98,110,143,149,[152][153][154] with some evidence of AE associated with plastic deformation. 141,147 Research has focused on thin films deposited using techniques such as physical vapour deposition (PVD), 110,141,144,151 chemical vapour deposition (CVD), 143,145,147 microwave plasma chemical vapour deposition (MPCVD) 149,150,153,154 or plasma assisted chemical vapour deposition (PACVD), 142 and other process such as sputtering 152 or pulsed laser deposition.…”

Section: Ae Monitoring Of Thin Solid Filmsmentioning

confidence: 99%

“…Unlike bulk metals and ceramics where AE activity is generally associated with microstructural features, thin solid films present a complex AE waveform which is influenced by not only the microstructural features of the coating and substrate materials but also the adhesive strength of the film. 96,110,[141][142][143][144][145][146][147][148][149][150][151] Despite these complexities, AE monitoring of thin solid films has received wide research interest as the films are (1) generally hard and hence exhibit AE activity due to cracking and (2) indentation above a critical load generally initiates further cracking and AE activity due to film debonding. Investigations in this area generally tend to have a unique AE feature of pop-in or burst events which tend to correlate with large indenter displacement in the force indentation curve (Figs.…”

Section: Summary Of Conclusion: Thin Solid Filmsmentioning

confidence: 99%

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Indentation testing and its acoustic emission response: applications and emerging trends

Faisal

Ahmed

Reuben

2011

International Materials Reviews

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This review summarises the state of knowledge on acoustic emission (AE) techniques applied to material property evaluation during indentation (e.g. hardness) testing. There are two aspects of application of AE technique to indentation which makes it unique, i.e. (1) enhancing the understanding of the evolution of material accommodation mechanisms under loading and (2) qualitative and quantitative evaluation of mechanical properties such as fracture toughness and bond strength from the AE signal. Both of these aspects have the potential to improve our understanding of the structure property relationships of current and future generation materials. In addition, the knowledge developed here can be incorporated to improve the AE based condition monitoring systems for stress critical applications. This review concentrates on the phenomena which occur during indentation and how its examination can be used to study more fundamental behaviour of materials such as deformation and fracture. The uncertainty in quantifying and measuring the total crack surface in indentation makes a simple fracture mechanics based assessment of toughness difficult. It is therefore expected that correlation between AE and fracture patterns will lead to an improved method for material's quality evaluation. The main part of this review is presented on AE of material classifications. These classifications include ceramics, glasses, composites, metals and metallic foams, thin solid films and thermally sprayed coatings. Apart from quasi-static indentation testing, attention has also been paid to studies on various AE instrumented indentation systems so that information can be derived about the progress of deformation and cracking processes. This review discusses the studies summarising those aspects that have so far been established and the areas of controversy and/or lack of knowledge. The prospect of using AE techniques to monitor indentation tests is also assessed, taking into account those few studies that have been reported so far in different groups of materials. Although with some limitations, it is concluded that AE monitored indentation testing has considerable scope to assess in much more detail the deformation and cracking properties of materials under localised stress condition. It is possible to construct empirical relationships and develop theoretical understanding linking mechanical parameters with AE signal characteristics and its derived features. However, the occurrence of multiple events at different locations superimposing the AE signal requires more advanced signal processing techniques. With the advancement of very thin films and nanomaterials, it is anticipated that AE response measured during nanoindentation will be critical for enhancing our understanding of future generation applications, as it allows individual events to be investigated without resorting to more complex signal processing techniques. In terms of material accommodation, the understanding of physical mechanisms generating AE require a multiscale approach, e...

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Section: Vickers Indentersmentioning

confidence: 85%

Section: Ae Monitoring Of Thin Solid Filmsmentioning

confidence: 99%

Section: Summary Of Conclusion: Thin Solid Filmsmentioning

confidence: 99%

See 1 more Smart Citation

Indentation testing and its acoustic emission response: applications and emerging trends

Faisal

Ahmed

Reuben

2011

International Materials Reviews

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show abstract

“…In 1997, Tanikella et al [7] proposed to use an amorphous silicon-carbide coating deposited on an substrate as sensor for indentation control tests of fracture damage morphology. Okabe [8] applied fiber Braggrating (FBG) sensors to the detection of transverse cracks in carbon fiber reinforced plastic (CFRP) cross-ply laminates using the sensitivity of the sensors to non-uniform strain distribution, and they calculated the strain transferred from the laminate to the core of an embedded optical fiber by a theory developed from the shear-lag model.…”

Section: Introductionmentioning

confidence: 99%