[Study of the mechanical properties of a duplex structured material using the finite element method]
The microstructural design concept of bio-ceramics is based on relatively large (10–100 μm) spherical zones dispersed in a ceramic matrix. These zones contain variable fractions of ZrO2 particles. On cooling from the fabrication temperature they expand relative to the matrix either completely during cooling or at first partially and then continue by stress induction. Compressive stresses are developing within and radially around zones. Tensile hoop stresses are created tangentially around the zones.
The objective of these spherical zones is to preserve stress of rupture of the matrix at a high value and to support the deviation and the cracks bifurcation. The reinforcement in these materials is related to the interaction between the stress field in crack face and the residual stress fields around the spherical zones.
In this article, we propose a study of the stress field around spherical inclusions using the finite elements method. These results are compared with those found analytically.
Le principe d'élaboration microstructurale des céramiques à base d'alumine repose sur la dispersion des zones sphériques relativement larges (10–50 μm) dans une matrice céramique (Claussen et Petzow, 1982–1984 [1]). Lors du refroidissement, ces zones avec des quantités variables en ZrO2, se dilatent par rapport à la matrice. Cette dilatation peut être complète ou partielle et engendre dans tous les cas des contraintes. Ces dernières peuvent être :
- • De compression en se développant à l'intérieur des zones et radialement à celle-ci.
- • De traction circulaires et tangentiellement à ces zones.
- • Conserver la contrainte à la rupture de la matrice à une valeur élevée.
- • Favoriser la déviation et la bifurcation des fissures.
Accepted:
Published online:
Keywords: Material engineering, Alumina, Zirconia, Spherical inclusion, Constraint field, Rupture resistance, Finite element
Said Laasri 1; M. Taha 1; E.K. Hlil 2; A. Hajjaji 3
@article{CRMECA_2011__339_1_35_0, author = {Said Laasri and M. Taha and E.K. Hlil and A. Hajjaji}, title = {\'Etude du comportement m\'ecanique d'un mat\'eriau \`a structure duplex par la m\'ethode des \'el\'ements finis}, journal = {Comptes Rendus. M\'ecanique}, pages = {35--41}, publisher = {Elsevier}, volume = {339}, number = {1}, year = {2011}, doi = {10.1016/j.crme.2010.11.008}, language = {fr}, }
TY - JOUR AU - Said Laasri AU - M. Taha AU - E.K. Hlil AU - A. Hajjaji TI - Étude du comportement mécanique d'un matériau à structure duplex par la méthode des éléments finis JO - Comptes Rendus. Mécanique PY - 2011 SP - 35 EP - 41 VL - 339 IS - 1 PB - Elsevier DO - 10.1016/j.crme.2010.11.008 LA - fr ID - CRMECA_2011__339_1_35_0 ER -
%0 Journal Article %A Said Laasri %A M. Taha %A E.K. Hlil %A A. Hajjaji %T Étude du comportement mécanique d'un matériau à structure duplex par la méthode des éléments finis %J Comptes Rendus. Mécanique %D 2011 %P 35-41 %V 339 %N 1 %I Elsevier %R 10.1016/j.crme.2010.11.008 %G fr %F CRMECA_2011__339_1_35_0
Said Laasri; M. Taha; E.K. Hlil; A. Hajjaji. Étude du comportement mécanique d'un matériau à structure duplex par la méthode des éléments finis. Comptes Rendus. Mécanique, Volume 339 (2011) no. 1, pp. 35-41. doi : 10.1016/j.crme.2010.11.008. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2010.11.008/
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