31 Laminate Plasticity
Crystalline materials deform by a process of crystalline slip, whereby material is transported via shear across distinct crystal planes and only in certain distinct crystallographic directions in those planes. This process imparts a strong directionality to the plastic flow process and specifies a clear kinematic definition to the plastic spin. In what follows the theory is developed around a model for a laminated material; this is done to demonstrate the generality of the approach to a broader range of materials where slip is kinematically mediated by fixed directions.
31.1 Laminate Model
We consider the fiber reinforced plastic (FRP) material to be composed of an essentially orthotropic laminate, which contains a sufficient ...