Porous materials are widely used as structural materials of low specific weight or for purification of liquids, gas transfer in fuel cells etc. They may be considered as a kind of composites where pores play as a second phase. As to their mechanical behavior these materials may fail like dense non-porous ones with a few fracture mechanisms, mainly as follows: cleavage, brittle intergranular (interphase) fracture, and pores coalescence. In contrast to accepted point of view that pores influence negatively on strength and fracture toughness of different materials it was found that the dependence of fracture toughness on porosity itself depends on fracture mechanism as it was published for the first time in [1].
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