The applicability of Electro-Mechanical Impedance (EMI) approach to damage detection, localization and quantification
in a mobile bridge structure is investigated in this paper. The developments in this paper focus on assessing the health of
Armored Vehicle Launched Bridges (AVLBs). Specifically, two key failure mechanisms of the AVLB to be monitored
were fatigue crack growth and damaged (loose) rivets (bolts) were identified.
It was shown through experiment that bolt damage (defined here as different torque levels applied to bolts) can be
detected, quantified and located using a network of lead zirconate titanate (PZT) transducers distributed on the structure.
It was also shown that cracks of various sizes can be detected and quantified using the EMI approach. The experiments
were performed on smaller laboratory specimens as well as full size bridge-like components that were built as part of
this research. The effects of various parameters such as transducer type and size on the performance of the proposed
health assessment approach were also investigated.