Strain-rate based arclength model for nonlinear microscale analysis of unidirectional composites under off-axis loading

In this paper, a micromechanical framework for modeling the rate-dependent response of unidirectional composites subjected to off-axis loading is introduced. The model intended thin slice representative volume element that oriented perpendicular reinforcement composite material. testing conditions from uniaxial test are achieved by dedicated strain-rate based arclength formulation. constraint equation constructed such deformation state micromodel, as imposed in its local coordinate system, corresponds applied on material global frame reference. kinematic description allows finite strains material, meaning micromodel changes orientation during process. This geometric nonlinear effect also included evaluation external loading, ensuring forces equivalent stress system. Several examples considered order show resolves rate-dependency accounts different and captures exactly. Additionally, small strain version derived general framework. Results obtained with simplified approach compared results large