Impact determination and assessment of acoustic windows
Structural testing on acoustic windows has been performed to determine how an impact load would alter the integrity of acoustic panels. In performing the structural testing three pairs of panels were used. Each pair consisted of two panels of the same composition. One of the panels from each pair was subjected to a quasi-static vacuum load applied to the bottom of the panels and the remaining panels were subjected first to an impact load followed by the same quasi-static testing. The deflection and strain of each of the panels were measured on the top surface of the panels during the quasi-static testing. It was determined that those panels subjected to the impact load deflected less than those subjected only to the quasi-static load. This is likely due to delamination between the layers in the damaged panels and the fact that the load and deflection were measured on opposite surfaces of the panels. The results do not indicate that the damaged panels have increased stiffness. The strain in the panel increased for all three pairs along the weave direction but decreased along the warp direction for the panels subjected to impact. Changes in the bias direction were inconclusive. © 2011, Society for Experimental Mechanics.
Digital Object Identifier (DOI)
Parkhurst, Nguyen, T., Ferguson, M., & Schonning, A. (2012). Impact Determination and Assessment of Acoustic Windows. Experimental Techniques (Westport, Conn.), 36(6), 48–57. https://doi.org/10.1111/j.1747-1567.2011.00767.x