| Popis: |
Characterization of delamination fields in 3D for impact damaged composites is necessary to achieve the USAF objective of damage tolerance for polymer matrix composites [1, 2]. In order to characterize the hidden region of delamination fields, oblique angle ultrasound inspection is being investigated [3]. Benchmark studies with side-drilled hole (SDH) specimens are presented for model verification. The results from CIVA FIDEL 2D are compared to results from PZFlex, and experimental data. CIVA FIDEL 2D offers a computationally faster model using a semi-analytical beam model to reduce the finite difference time domain (FDTD) size and thus reduce the simulation run time. This modeling approach contrasts with the expense of the accuracy that a full finite element model (FEM) such as PZFlex provides. It is shown that a large number of lower fidelity models can be run and evaluated in an expedient manner with CIVA FIDEL to efficiently reduce the possible design space. Key cases can then be simulated with more computationally expensive, but highly accurate models, followed by experiments for verification. Model results showing the possibility of oblique angle ultrasonic detection of shadowed delaminations is presented.Characterization of delamination fields in 3D for impact damaged composites is necessary to achieve the USAF objective of damage tolerance for polymer matrix composites [1, 2]. In order to characterize the hidden region of delamination fields, oblique angle ultrasound inspection is being investigated [3]. Benchmark studies with side-drilled hole (SDH) specimens are presented for model verification. The results from CIVA FIDEL 2D are compared to results from PZFlex, and experimental data. CIVA FIDEL 2D offers a computationally faster model using a semi-analytical beam model to reduce the finite difference time domain (FDTD) size and thus reduce the simulation run time. This modeling approach contrasts with the expense of the accuracy that a full finite element model (FEM) such as PZFlex provides. It is shown that a large number of lower fidelity models can be run and evaluated in an expedient manner with CIVA FIDEL to efficiently reduce the possible design space. Key cases can then be simulated with more c... |
