Abstract
Tensile and four-point bending tests on porous ceramics are carried out and their fracture properties are investigated. A formula model was devised and FEM model analysis was carried out in order to simulate the fracture properties. The results obtained are summarized as follows. (1) Experimental results show non.liner deformation during the loading process that is not observed in monolithic ceramics. (2) The fracture model in which porous ceramics is regarded as mixture elements of ceramics and pores is proposed, and this model can simulate well experimental results. (3) FEM models show that the nominal fracture stress for a model with small cross sectional area is smaller than that with larger one. (4) FEM models using pore elements could simulate dispersion of strength that is strongly affected by distribution of pore elements.
