Acoustic Emission during Indentation Fracture

Tanikella, B. V.; Scattergood, R.O.

doi:10.1111/j.1151-2916.1995.tb08874.x

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…It has been suggested that the threshold at which AE activity occurs during indentation can be used to quantify the fracture toughness of engineering ceramics using the nanoindentation technique. 115 103,115,[119][120][121][122][123] and crack growth. 124,125 Glasses are regarded as ideal brittle material, 11 which can be characterised by analysing the dominant indentation cracking (e.g.…”

Section: Summary Of Conclusion: Ceramicsmentioning

confidence: 99%

“…However, in this area of dipole strength analysis, further work in needed for other group of materials and indenter shapes in order to establish the applicability of this approach. Tanikella and Scattergood 121 found that the AE measurement in soda lime glass was highly reproducible and can provide information on Hertzian ring crack initiation, although no measurement on other types of cracks was reported.…”

Section: Conical Indentersmentioning

confidence: 99%

“…The pyramidal shape of the Knoop indenter can also induces radial and lateral cracks similar to the Vickers. Tanikella and Scattergood121 found that AE measurements using a Knoop indenter were not very reproducible but that the AE can be used to monitor the initiation of lateral cracks at specific points of loading and unloading.…”

Section: Ae Monitored Indentationsmentioning

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: Summary Of Conclusion: Ceramicsmentioning

confidence: 99%

Section: Conical Indentersmentioning

confidence: 99%

Section: Ae Monitored Indentationsmentioning

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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“…However, it is not possible to detect the formation and spreading of cracks with the traditional monitoring method by measuring the force. The application of the acoustic emission (AE) may be possible where this technique is capable of sensing the changes in the structure of the material [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Detection of cracks in scratching tests in ceramic materials through acoustic emission

Sanchez

Oliveira

Coelho

2005

Proceedings of the Institution of Mechanical Engineers, Part B:

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The mechanisms of material removal and the interactions among scratches performed in ceramic materials were investigated using acoustic emission signals, and scanning electron microscopy, in scratching experiments. Several testing conditions were used to produce different types of removing mechanism on a glass as well as on a polycrystalline alumina sample composed by heterogeneous grain size. It is known that the material removing process on a polycrystalline ceramic involves intergranular microfracture and grain dislodgement, unlike the chipping produced by the extension of lateral cracks in non-granular materials, such as glass. Distinct settings for velocities, loads, and two types of diamond indenter were tested. The material removal was carried out by three different methods of scratching: single passes, repeated overlapping passes, and parallel scratches. As a general result, there was a clear relationship between the acoustic emission signals and the damage intensity occurred in the material removal. More specifically there were differences in the acoustic emission signal levels in the scratches made on the alumina and on the glass owing to the material removal mechanisms associated with the structure of these materials. A gradual increase in the acoustic emission levels was observed when the number of repeated passes was increased as a result of the damage accumulation process followed by severe material removal. It was also noticed that the acoustic emission signals were capable of reflecting the interactions between two parallel scratches.

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Vickers Indentation Fracture in Optical Glass Compositions

Wilantewicz

Varner

2007

Ceramic Transactions Series

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Acoustic Emission during Indentation Fracture

Cited by 9 publications

References 6 publications

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

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

Detection of cracks in scratching tests in ceramic materials through acoustic emission

Vickers Indentation Fracture in Optical Glass Compositions

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