Abstract
Based on the theory of modal acoustic emission, this paper describes a new method to determine whether a plate made of a composite material has been damaged following external impact. Using modal acoustic emission theory, the relationship between the Lamb-wave mode of acoustic emission and the force direction in the plate was analyzed. This relationship was then verified using a lead-break experiment. The Lamb-wave mode of the acoustic emission signals produced by the damage in the plate was investigated, and the criterion for assessing the impact damage was proposed. During the impact experiments, the proposed criterion was employed to monitor the impact damage of the plate. The results indicate that it is feasible to use acoustic emission signals to directly determine whether an impact had caused damage to the plate.
Highlights
Due to their excellent mechanical properties, composite materials have been widely used in aircraft structures, pressure vessel shells, and pressure piping
This paper considers mainly the impact vertical to the plate surface, if there is a certain angle between the impact direction and the vertical direction, the acoustic emission produced by the force parallel to the direction of the plate surface belongs to the mode of the Lamb-wave
Since this article uses mainly the impact acoustic emission signals to determine whether a composite plate has been damaged after impact, it is necessary to conduct relevant experiments to study the acoustic emission Lamb-wave mode produced by the damage in the plate
Summary
Due to their excellent mechanical properties, composite materials have been widely used in aircraft structures, pressure vessel shells, and pressure piping. Davide Nardi et al used the vibration signal of carbon-fiber reinforced composite plates to monitor impact damage. They obtained different output parameters for undamaged and damaged plate structures using the optimized auto-regression-model algorithm [7]. STUDY OF MODAL ACOUSTIC EMISSION TO MONITOR THE IMPACT DAMAGE IN A COMPOSITE PLATE. It can be seen that there are various methods to monitor the impact damage of composite material plate structures. Research to determine impact damage by directly using the impact acoustic emission (AE) of composite plates has rarely been reported. A method that can directly determine the impact damage of the composite plate structure, using impact acoustic emission, is put forward. The acoustic emission source, which was located by the damage signal geometric method, was compared with the real damage location
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