FRP laminated structures enjoy the advantages of a low mass and high specific strength. However, the utilization of laminated forming methods causes these structures to become susceptible to phenomena such as delamination and fiber breakage, which lead to strength deficiencies, when they sustain low-velocity impact. In light of this, increasing the low-velocity impact strength of FRP laminated structures has been a major direction. This study utilizes Constrained Layered Damping (CLD) to enhance the low-velocity impact strength of FRP laminated structures, and assesses the efficiency of attaching CLD to laminated materials in increasing low-velocity impact strength. The results provide a reference for the design and construction of relevant structures in the future. Low-velocity impact failure in FRP laminated structures commonly includes fiber breakage and delamination. Delamination is particularly apparent when laminated curved shells bear external loading. We will attach CLD to the rear of FRP laminated structures to appropriately absorb impact energy, increasing the low-velocity impact strength of the structures. Results showed that the existence of CLD effectively delayed the occurrence of delamination, increasing the post-failure strength of laminated structures and alleviating structural failure. Finally, the energy perspective is used to assess the efficiency of increasing the low-velocity impact strength of FRP structures after attaching CLD.
A transmission silica phase mask grating was used to fabricate LiNbO3 wafer phase gratings by a single excimer pulse at 248 nm. The morphologies of the LiNbO3 wafer gratings were studied with an atomic force microscope as well as an optical microscope. The crystal structures of the gratings were characterized by x-ray diffraction and three new crystal phases were found at the gratings’ surface besides the substrate phase of LN (110).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.