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Non-linear response. Advance MUltiscale Strain-basED non-destructive evaluation of composite structures.

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Uk partners



Advance MUltiscale Strain-basED non-destructive evaluation of composite structures

The AMUSED project aims to combine the strengths of multiple full-field optical measurement techniques for inspection of high value composite structures. The challenge is to apply techniques, traditionally tethered to the laboratory, in-situ on structures that potentially contain defects or damage.

Figure 3

Coupon tests

Coupon tests where conducted to enable a correlation between surface response and underlying damage types to be assessed. This example shows a simulated fibre break.

Mode 1

Stinger & plate setupMode 2

Natural frequency loading

Natural frequency loading enables large strains to be achieved with minimal excitation energy. This has been tested initially on a fully clamped plate excited at its first 3 modes.

TSA data

X-ray CT slicePPT data

TSA (thermoelastic stress analysis) and PPT (pulsed phase thermography) have been used to inspect carbon fibre bridge repairs, based on the experience gained in the laboratory. The next phase is to test larger, representative aircraft components and to add DIC (digital image correlation) and ESPI (electronic speckle pattern interferometry) to the tool box, with the aim to develop a strategy for integrating the four techniques on a common platform.

Fluid Structure Interactions Research Group

Infrared sensing for materials characterisation and damage assessment

Dr. Richard Frühmann - [email protected] - School of Engineering Sciences

Supervisor – Prof. J. M. Dulieu-Barton

High Speed Material Characterisation

The mechanical response of a material to an applied load or strain is dependent on the rate at which a load or strain is applied. The behaviour of composite materials under high speed deformation, such as during collisions or foreign body impacts, is currently not well understood. IR thermography is being used to measure the heat generated during a high speed deformation to inform a full thermo-mechanical material characterisation.

Initial Composite Tests

  • Loading rate: 5 ms-1

  • Frame rate: 15000 Hz

  • IT: 60 μs

  • Window size: 64 x 12 pixels

The short exposure times required for the high speed imaging impose special calibration challenges because the detector operates in the non-linear response range. A pixel-wise detector calibration procedure has been developed to accommodate the non-linear detector response and implemented as a software module (shown right). In initial tests it has been possible to capture both the thermoelastic temperature decrease and the heat released at failure.

thermoelastic effect

  • Loading rate: 10 ms-1

  • Frame rate: 15000 Hz

  • IT: 60 μs

  • Window size: 64 x 12 pixels

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