Author(s)

I. Kozar & J. Ozbolt

Abstract

: Authors discuss the reasons for unrealistic Poisson's coefficient expansion present in the kinematic constraint type of microplane model used for soft- ening type of materials. In order to gain a better insight into the problem a simple two parameter scalar damage model has been built. It is shown that arbitrary combination of damage parameters, although mathematically allowable, can lead to physically unacceptable Poisson's ratio values. Care- fully chosen functional dependence between damage parameters in a two parameter model gives us any in advance defined Poisson's ratio. However, for more damage parameter models, such as microplane, this is not possi- ble. The main idea of the microplane model has been used as a basis for a tensor damage formulation in which are damage tensors obtained through the integration over microplanes, separatel

Keywords