ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Alumina-zirconia multilayered ceramics have been proposed as an alternative for thedesign of structural ceramics with improved fracture toughness and strength reliability. During theprocessing of these laminates, significant residual stresses may arise due to the thermal expansionmismatch between adjacent layers. The correct evaluation of such stress distribution in the laminatemay determine its range of application. In this work, the residual stress state in a layered materialdesigned with five thick alumina layers of approximately 650 microns alternated with four thinalumina-zirconia layers of approximately 140 microns was estimated using different methods. Afinite element analysis (FEM) was performed for stress evaluation in the bulk and an indentationmethod and X-Ray diffraction to account for stresses at the surface. Experimental findings show aconstant stress distribution within the bulk for each layer, while at the surface stress positiondependence is observed in the alumina layers, being the maximum tensile stresses near the layerinterface. The accuracy of the results provided by each technique is discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.421.pdf
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