Fluid-structure interaction of metallic and composite plates subjected to dynamic loading

Hampson, PR 2008, Fluid-structure interaction of metallic and composite plates subjected to dynamic loading , PhD thesis, University of Salford.

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An important consideration when designing structures from composite materials is their susceptibility to impact damage. Even under relatively low velocity impact, composites are vulnerable to internal damage caused by transverse loads, but unlike metallic structures, material damage can be hidden within the material and show no form of external damage. In some cases, barely visible impact damage (BVID) may occur, which even if detected by visual inspection would give no true indication to the severity of the internal material degradation. Since many composites are being utilised in high performance applications, it is important that the response of composites under impact loading is fully understood. This research examines the transient dynamic response of metallic and composite plates subjected to low velocity impact loading for conditions in both air and underwater by conducting a series of experiments and non-linear numerical analysis using the finite element technique. To verify the accuracy of this method for investigating impact problems, several numerical validation studies have been conducted using published results. An instrumented low velocity impact rig was used to acquire experimental data for impacts in air and underwater for both aluminium and composite plates. Experimental results were compared with numerical and theoretical solutions and found to be in good agreement. For underwater impact, the numerical modelling incorporated the use of Arbitrary Lagrange Euler (ALE) methodology, therefore, analysing the problem with coupled fluidstructure interaction. The effect of the water surrounding the target plates was found to reduce the peak accelerations and also reduce the overall impact duration. X-Ray imagery of the composite plates also showed visibly reduced damage for the submerged test specimens. This research provides data on the impact response of metallic and composite materials, and validates numerical methodologies for use in future work on fluid-structure interactions which show strong potential for relevant industrial applications.

Item Type: Thesis (PhD)
Contributors: Moatamedi, M (Supervisor)
Schools: Schools > School of Computing, Science and Engineering
Depositing User: Institutional Repository
Date Deposited: 18 Aug 2021 10:51
Last Modified: 04 Aug 2022 11:21
URI: https://usir.salford.ac.uk/id/eprint/61607

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