| Popis: |
The behaviour of composite structures at high strain rates differs considerably from the behaviour in static conditions. This is most evident in the mechanical properties which are determined by the matrix behaviour. Therefore, a numerical methodology for laminated CFRP structures has been developed in this work to include these high strain rate effects into the impact damage simulations. The failure criteria that have been developed for impact damage modelling in laminated composite structures have been implemented into Abaqus/Explicit using the VUMAT subroutine. The methodology follows the approaches in [1, 2], where the failure mode-based criteria have been modified to account for the strain rate effects by using scaling functions to model the effects at various impact velocities. Furthermore, the effects of various parameters that affect the damage initiation process have been analysed in this work. The methodology is based on the latest experimental knowledge of the composite materials behaviour at high strain rates while all relevant failure modes have been considered. The methodology has been applied and validated in the simulation of a drop weight impact test at CFRP structures. |
