Abstract
The uniaxial tensile stress-strain behavior of three porous ceramic materials was
determined at ambient conditions. Test specimens in the form of thin beams were
obtained from the walls of diesel particulate filter honeycombs and tested using a
microtesting system. A digital image correlation technique was used to obtain full-field
2D in-plane surface displacement maps during tensile loading, and in turn, the 2D strains
obtained from displacement fields were used to determine the Secant modulus, Young’s
modulus and initial Poisson’s ratio of the three porous ceramic materials. Successive
unloading-reloading experiments were performed at different levels of stress to decouple
the linear elastic, anelastic and inelastic response in these materials. It was found that the
stress-strain response of these materials was non-linear and that the degree of nonlinearity
is related to the initial microcrack density and evolution of damage in the
material.
