Indentation and acoustic emission in filtration processed platelet reinforced ceramics

Pyrz, Ryszard; Clausen, B.; Nielsen, E. Ø.

doi:10.1016/0921-5093(94)09749-6

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…Since the physical properties of these composite materials are generally nonisotropic, the stiffness of composites often depends upon the orientation of the applied stress. General assessment indicates that the material accommodation mechanisms are dominated by the 'burst type high amplitude AE signals' mainly due to fibre fracture [126][127][128][129][130][131] with some evidence of dislocation movement, 114 delamination 132 and debonding. 133,134 Hertzian (spherical) indenters…”

Section: Summary Of Conclusion: Glassesmentioning

confidence: 99%

“…29). Form et al 131 were interested in fracture toughness differences between specimens of zirconia (ZrO 2 ) matrix material with its alumina platelet reinforcement. They suggested that by increased toughening features (i.e.…”

Section: Ae Monitored Indentationsmentioning

confidence: 99%

“…AE monitored Vickers indentation of zirconia composites showing comparison of AE energy for the zirconia matrix and with 5 wt‐% alumina composite131 …”

Section: Ae Monitored Indentationsmentioning

confidence: 99%

“…It has been attributed that friction between indenter and specimen affects the deformation of specimen, particularly if the indenter and specimen have different moduli 9,83. At present, there is no known technique to determine the effect of friction between indenter and specimen and no work as found in this review describes the effect of friction during indentations, although there has been some concerns addressed through AE monitored indentation analysis 131,147,173. It needs to clearly identify the AE signatures due to friction during indentation which is always present due to dissimilar and non‐confirming nature of material of indenter and specimen.…”

Section: Measurement Of Mechanical Properties and Prospects Of Ae Mon...mentioning

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: Glassesmentioning

confidence: 99%

Section: Ae Monitored Indentationsmentioning

confidence: 99%

“…AE monitored Vickers indentation of zirconia composites showing comparison of AE energy for the zirconia matrix and with 5 wt‐% alumina composite131 …”

Section: Ae Monitored Indentationsmentioning

confidence: 99%

Section: Measurement Of Mechanical Properties and Prospects Of Ae Mon...mentioning

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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“…By locating the acoustic emission sensor directly underneath the sample it was possible to eliminate spurious signals that may occur when the diamond indenter is not effectively coupled with the sample [10]. Acoustic emission signals were recorded and correlated with the nanoindentation data in real time, using the following parameters: threshold value of 21.9 dB, transient sampling rate of 10 MHz and parametric timing of 0.001 s.…”

Section: Indentation and Acoustic Emission Setupmentioning

confidence: 99%

Acoustic Emission Analysis of Nanoindentation-Induced Fracture Events

Dyjak

Singh

2006

Exp Mech

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Monitoring of acoustic emission activity is employed to characterize the initiation and progression of local failure processes during nanoindentation-induced fracture. Specimens of various brittle materials are loaded with a cube-corner indenter and acoustic emission activity is monitored during the entire loading and unloading event using a transducer mounted inside the specimen holder. As observed from the nanoindentation and acoustic emission response, there are fundamental differences in the fracture behavior of the various materials. Post-failure observations are used to identify particular features in the acoustic emission signal that correspond to specific types of fracture events. Furthermore, analysis of the parametric and transient acoustic emission data is used to establish the crack-initiation threshold, crack-arrest threshold, and energy dissipation during failure. It is demonstrated that the monitoring of acoustic emission signals yields both qualitative and quantitative information regarding highly localized failure events in brittle materials.

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Synthesis of plate-like α-Al2O3 single-crystal particles in NaCl–KCl flux using Al(OH)3 powders as starting materials

Zhu

Huang

Liu

2008

Ceramics International

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Indentation and acoustic emission in filtration processed platelet reinforced ceramics

Cited by 6 publications

References 17 publications

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

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

Acoustic Emission Analysis of Nanoindentation-Induced Fracture Events

Synthesis of plate-like α-Al2O3 single-crystal particles in NaCl–KCl flux using Al(OH)3 powders as starting materials

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