首页|Bending and Contact Strength of a Ceramic Nanocomposite
Bending and Contact Strength of a Ceramic Nanocomposite
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The paper deals with the determination of the characteristic strength δ_(0,bend) and δ_(0,cont) as well as the Weibull moduli m_(bend) and m_(cont) of the Si_3N_4+SiC micro/nanocomposite determined by the four-point bending test and the contact test using opposite spheres both applied to specimens of different size, respectively. Material failure in the bending and contact modes is caused by the presence of processing defects as fracture origins, and by the formation of cone cracks, respectively, where a stable growth of the cone cracks initiated during contact loading is assumed to be a reason of δ_(0,cont) >>δ_(0,bend), m_(cont)>>m_(bend). A microstructural analysis of the processing flaws, and a mathematical analysis of the propagation of the cone cracks regarding different dimensions of a specimen are also presented.
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NSTL
