COUPLING OF ZONES WITH DIFFERENT RESOLUTION CAPABILITIES IN DYNAMIC FINITE ELEMENT MODELS OF WOVEM COMPOSITES
Keywords:Finite elements, woven structures, model reduction, parameter identification
AbstractAn approach for creating a reduced cost-effective dynamic finite element computational model of the missile impact upon the woven textile target is presented. The model of a woven patch developed in LS-DYNA finite element environment, the internal structure of which was based on the mathematical representation of all contact interactions among the yarns of the woven structure has been employed as a reference model. The equivalent membrane model served for the computationally cheaper representation of the farther zones of the woven structure. They farther zones surround the patch of the woven structure, which is in immediate contact with the missile. The synthesis of the membrane model is based on the adjustment of in-plane and out-of-plane waves propagation velocities in both woven and membrane zones. The reduced model of the woven structure is based on the girder structure, the links between nodal points of which were expressed by using elastic and viscous elements. Only contact interactions of the surface of the missile against the girder needed to be determined during each time integration step. The task of the synthesis of the reduced model has been presented in the form of the optimization problem, where the cumulative displacement error has been used as the target function. The physical meaning of the target function is the mismatch between the displacements of the two models end. Alternatively, the artificial neural network approach has been employed for obtaining the physical parameters of the reduced model.
DYNAMICS OF MECHANICAL SYSTEMS