Filtreler
Damage assessment of oxide fibre reinforced oxide ceramic matrix composites using acoustic emission

Kaya F.

Article | 2007 | Ceramics International33 ( 2 ) , pp.279 - 284

The damage mechanisms of woven mullite fibre (Nextel 720™) reinforced alumina ceramic matrix composites (CMCs) were monitored during tensile tests using acoustic emission (AE) technique. The effects of microstructural characteristics, such as porosity and pore size as well as the nature of interfacial zone between fibre and matrix on the type of damage were also examined and correlated with the microstructural observations. It is shown that based on the energy level of acoustic events, during the tensile tests, delamination of the fibres from the matrix takes place first then multiple matrix cracks form and finally reinforcement fib . . .res break before the composite's final failure. It is also shown that porosity content of the composite samples influences the acoustic emission response during the tensile loading, as both amplitude and the energy values are higher for the composites with low porosity level and smaller pore diameter. © 2006 Elsevier Ltd and Techna Group S.r.l Daha fazlası Daha az

Damage detection in fibre reinforced ceramic and metal matrix composites by acoustic emission

Kaya F.

Conference Object | 2010 | Key Engineering Materials434-435 , pp.57 - 60

In this work damage micro-mechanisms of two different types of fibre reinforced composites are investigated by acoustic emission, AE. Ceramic based oxide fibre reinforced mullite matrix composite and metallic based SiC fibre reinforced titanium matrix composites exhibit different fracture mechanisms during loading and AE technique could pinpoint these damage mechanisms based on the AE responses detected simultaneously. The results show that in a ceramic matrix composite, the identification of fibre fracture and matrix cracking requires careful analysis of the AE data as both fibres and matrix break in brittle manner. Whereas the sep . . .aration of fibre fracture from the ductile tearing of matrix ligaments could be easier in metallic based composites, such as titanium matrix composites. © (2010) Trans Tech Publications Daha fazlası Daha az

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