| Summary: | Approved for public release; distribution is unlimited === This paper presents a comparison of the dynamic response of composite structures that are subjected to low velocity impacts while being suspended both in air, and submerged in water. As the U.S. Navy continues to use larger composite components in the construction of their ships, an understanding of the effect of submergence in water (i.e., fluid-structure interaction) on various locations of the structures can be instrumental in the design process of ship components. To better understand the responses at varying locations due to fluid-structure interaction, a composite plate was made with several strain gages affixed in one quadrant. The plate was then subjected to increasing impact forces while suspended in air, as well as being submerged in water. Additionally, a beam sample was also tested under the same conditions, with strain gages being affixed in-line with the impact rod. By comparing the strain gage responses between the open air and submerged samples, a better understanding of the magnitude of the fluid structure interaction is achieved, identifying critical locations in the samples that are most likely to fail.
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