The distribution features of local-stress for ceramic composites reinforced by the whiskers and particle with different mechanical properties are simulated by the 3-dimensional finite element method (FEM) (MSC-MARC), and the phase average stresses are calculated. For the purpose of comparison, a theoretical formula (effective Mori-Tanaka theory, EMT) combining the Eshelby's theory with Mori-Tanaka method is derived to calculate the phase average stress. The results show that the phase average stresses obtained by EMT are in good agreement with those by FEM, and there is an obvious difference to share the average stress among reinforcements with different shapes and different mechanical properties. The whiskers are prior to the spherical particles to bear high stress, and to decrease the stress in the matrix, and to improve the strength of multi-phase hybrid ceramic composites. The results from FEM also show the influences of the change of positions, and the change of elastic modulus for whiskers on the distribution features of local stress, and it is beneficial to make a failure analysis for multi-phase hybrid ceramic composites. The spherical particles are effective to improve the distribution of local stress by adjusting the positions of the whiskers.
|ジャーナル||Jixie Qiangdu/Journal of Mechanical Strength|
|出版ステータス||出版済み - 4月 1 2013|
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