Single spring damage elastoplastic with a hemivariational approach

The examination of stress transfer phenomena at the interphase of composite materials has long been a focal point in mechanical engineering. This investigation involves an in-depth study at these interfaces, aiming at exploring the mechanisms governing stress distribution and exchange across the distinct phases. In order to exploit the interaction between diverse materials within each phase, leveraging their complementary attributes, the bond behaviour analysis would help to optimize the overall performance and functionality of the composite material. Many documents are available in literature providing efficient computational simulations, reproducing the non-linear behaviour of the interface contact. Nevertheless, much models have appeared dependent on the grid-mesh, on the step interaction and other factors. Therefore, this research aims to provide an interface modelling, based on the elastoplastic response for a single spring [1]. The damage formulation has developed considering the following contributions: irreversible damage, plastic kinematic descriptors, and a hemivariational approach [2]. Karush-Kuhn-Tucker conditions are derived to govern the evolution of descriptors, damage, and plastic variables. The suitability and the reliability of this model has verified comparing the numerical results to the experimental ones of the pull-out tests [3] carried out for different systems of a single steel cord embedded in an inorganic mortar matrix. Likewise, the evolution of damage and plasticity is demonstrated.