Abstract
Abstract The effect of underwater shock loading on an E-Glass/Epoxy composite material has been studied. The work consists of experimental testing, utilizing a water filled conical shock tube and computational simulations, utilizing the commercially available LS-DYNA finite element code. Two test series have been performed and simulated: (1) a reduced energy series which allowed for the use of strain gages and (2) a series with increased energy which imparted material damage. The strain gage data and the computational results show a high level of correlation using the Russell error measure. The finite element models are also shown to be able to simulate the onset of material damage by both in-plane and delamination mechanisms.
Highlights
A conical shock tube has been used to study the response of an E-Glass / Epoxy composite material subjected to underwater shock loading
This work has served to show that computational tools can serve to support experimental test results and show promise for use as an alternative to testing to support structural designs utilizing composite materials
A conical shock tube has been used to study the response of curved E-Glass / Vinyl ester composite panels subjected to underwater shock loading
Summary
In a military environment these structures must be designed in a manner in which they will be able to survive an underwater explosion (UNDEX) event This results in a need to understand the behavior of these materials at strain rates associated with static load levels (10-4 – 10-3) and at loading rates many orders of magnitude higher (101 - 103). The response at the high strain rates that UNDEX/shock events can induce is not well understood This typically results in composite structures being conservatively designed with large safety factors to ensure that damage will not occur. Composite materials have been widely used in a variety of applications in the marine, automotive, and transportation industries These materials offer the advantages of high strength to weight ratios, reduced maintenance costs, and improved corrosion resistance. The focus of the current research is on the response of composite materials subjected to underwater explosions, UNDEX
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