CHARACTERIZATION OF POROUS MEDIA BY A SIZE SENSITIVE HOMOGENIZATION APPROACH
Ludmila Parashkevova · Journal of theoretical and applied mechanics · 2020
The present study concerns the mechanical properties assessment of porous media with a moderate porosity of a closed-cells type.On the base of the generalized mixture rule coupled with a size-sensitive variant of Mori-Tanaka theory the new explicit formulae are obtained.The elastic characteristics and the initial yield stress of a porous composite are calculated by two models, accounting for pore sizes.In both model variants the matrix is considered as a micropolar centrosymmetric medium.The size effect predicted depends on the ratio between the mean pore size/ the matrix intrinsic length.It is stronger if the pores are very small, but always remains limited.