抄録
The piezoelectric thin film (PVDF: polyvinylidene fluoride) sensors with good dynamic sensing characteristics can be used to monitor low velocity impacts on composite structures. The relation between the impact forces and the signals of the PVDF sensor for a composite sandwich beam was derived. Impact tests at low energy without inducing damage were performed on an instrumented drop weight impact tester. The measured signals of the PVDF sensors attached on the surface of the beam agreed well with the simulated signals in the forward problem. In the inverse problem, the iterated Tikhonov regularization method was used to reconstruct the impact forces from the PVDF sensor signals. Most of the reconstructed impact forces showed good agreement with the measured forces. The comparison results showed that the piezoelectric thin film sensor could be used to monitor low velocity impacts on composite sandwich structures.
