This paper proposes a semi-numerical model providing accurate estimates for the mechanical behaviour of viscoelastic microcracked masonry. It relies on two steps. The first one approximates creep mortar by coupling - in Laplace-Carson symbolic space Griffith's theory to Ponte-Castañeda & Willis (PCW) micromechanical scheme accounting microcracks interactions and spatial distribution. PCW is an ...

The nonlinear mechanical behavior of viscoelastic materials is modeled based on the Schapery integral model containing internal variables. In this context, a new approach for strain-dependent material properties introduced considering one-dimensional formulation with functions an oscillatory load case. addition to storage and loss modulus, higher order harmonic oscillations in stress response a...

Finite Element (FE) head models are often used to understand mechanical response of the head and its contents during impact loading in the head. Current FE models do not account for non-linear viscoelastic material behavior of brain tissue. We developed a new non-linear viscoelastic material model for brain tissue and implemented it in an explicit FE code. To obtain sufficient numerical accurac...