Abstract
In this study, composite materials were tested in two different environments to determine the role of Fluid Structure Interaction with composites under a low velocity impact. This was done using a low velocity impact machine and polymer composite plates. The composite is made of laminated symmetrical plain weave E-glass fabrics. The test area of the composite plates is 30.5 cm by 30.5 cm with clamped boundary conditions. The testing was done using a drop weight system to impact the center of the test area. One testing was performed with composite plates in air, called dry impact. The other testing was conducted while composite plates were submerged in water, called wet impact. A Plexiglas box in conjunction with the impact machine was used to keep the top of the composite sample dry while it was submerged in an anechoic water tank, so called water-backed air impact. Output from the tests was recorded using strain gauges and a force impact sensor. The results show that an added mass effect from the water plays a large role in the Fluid Structure Interaction with composites due to the similar densities of water and the composites. The wet impact results in a larger impact force and damage than the dry impact under the same impact condition, i.e., the same impact mass and drop height.
Highlights
Composites are becoming more and more important in today’s world
This study was undertaken to pursue a better understanding of Fluid Structure Interaction (FSI) effects on composite materials made from a woven fabric E-glass cloth
In order to investigate the dynamic response of the composite materials with FSI effects under impact loading, two impact conditions were considered
Summary
Composites are becoming more and more important in today’s world They have been popular in the aircraft industry for many years, and are currently attempting to make their way into the maritime industry as well. The application of these composites to the marine military environment is very appealing because of the high corrosion resistance offered by the composite. Another main reason for the use of composites is the very high strength to weight ratio. Other marine military applications include the use of composites to build ship’s rudders. It has been estimated that the cost of corrosion and corrosion related maintenance cost the U.S Navy approximately $22 billion annually [4]
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