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Long term behaviour of FRP structural foam cored sandwich beams

Long term behaviour of FRP structural foam cored sandwich beams
Long term behaviour of FRP structural foam cored sandwich beams

The work is concerned with the investigation of the long term flexural behaviour of structural FRP foam cored sandwich beams due to sustained constant (creep) and cyclic (fatigue) loads. An extensive review of both experimental and theoretical aspects has highlighted many uncertainties in long term behaviour that need to quantified for sandwich structure design to be further optimised. An extensive testing programme has been carried out and two main failure modes, core shear and skin tensile/compressive failure have been identified. It has been demonstrated that the fatigue performance of sandwich beams can be characterised in terms of the component skin and core behaviour. Using this approach, an S-N 'master' curve for sandwich core shear failures can be created, whilst skin failures can be characterised from raw skin coupon fatigue tests.

Under creep loads, global beam behaviour can be attributed purely to core shear mechanisms. A compatible modulus (stiffness) degradation approach for both creep and fatigue has been proposed which allows the separation of creep and fatigue components from a waveform where the elements of creep and fatigue are intimately mixed. By separating these components, a better understanding of how 'pure' fatigue damage accumulates is gained. A study of creep-fatigue interaction is also outlined. The sandwiched beam data have finally been used in context of the design of a lifeboat with particular reference to the fatigue limit-state.

University of Southampton
Clark, Simon Daniel
01c86770-2c87-4201-b200-a0ee00e2a1b7
Clark, Simon Daniel
01c86770-2c87-4201-b200-a0ee00e2a1b7

Clark, Simon Daniel (1997) Long term behaviour of FRP structural foam cored sandwich beams. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

The work is concerned with the investigation of the long term flexural behaviour of structural FRP foam cored sandwich beams due to sustained constant (creep) and cyclic (fatigue) loads. An extensive review of both experimental and theoretical aspects has highlighted many uncertainties in long term behaviour that need to quantified for sandwich structure design to be further optimised. An extensive testing programme has been carried out and two main failure modes, core shear and skin tensile/compressive failure have been identified. It has been demonstrated that the fatigue performance of sandwich beams can be characterised in terms of the component skin and core behaviour. Using this approach, an S-N 'master' curve for sandwich core shear failures can be created, whilst skin failures can be characterised from raw skin coupon fatigue tests.

Under creep loads, global beam behaviour can be attributed purely to core shear mechanisms. A compatible modulus (stiffness) degradation approach for both creep and fatigue has been proposed which allows the separation of creep and fatigue components from a waveform where the elements of creep and fatigue are intimately mixed. By separating these components, a better understanding of how 'pure' fatigue damage accumulates is gained. A study of creep-fatigue interaction is also outlined. The sandwiched beam data have finally been used in context of the design of a lifeboat with particular reference to the fatigue limit-state.

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Published date: 1997

Identifiers

Local EPrints ID: 463047
URI: http://eprints.soton.ac.uk/id/eprint/463047
PURE UUID: d00fb654-eb67-463e-bec0-a142d612165b

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Date deposited: 04 Jul 2022 20:41
Last modified: 16 Mar 2024 19:00

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Contributors

Author: Simon Daniel Clark

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