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Experimental Mechanics @
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Research
Applications: Aerospace |
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Much
of the research pursued by Dr Patterson’s research group has been sponsored
by or motivated by the aerospace industry.
Some of these connections are highlighted here. |
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Two and three dimensional
photoelasticity has been used to examine the stress associated with
disc/blade contact and the development of cracks from this interface. Developments in digital transmission
photoelasticity have been motivated by these problems. KENNY, B., PATTERSON,
E.A., SAID, M., ARADHYA, K.S.S., 1991., 'Contact stress distributions in a
turbine disc dovetail type joint - a comparison of photoelastic and finite
element results', Strain, 27(1): 21 - 24. NURSE, A.D., PATTERSON,
E.A., 1993, 'Experimental determination of stress intensity factor for cracks
in turbine disc', Fatigue Fract. Engng.,
Mater. & Struct., 16(3): 315-325. BURGUETE, R.L., PATTERSON,
E.A., 1997, ‘The effect of friction on crack propagation in the dovetail
fixings of compressor discs’, Proc. Institution of Mechanical Engineering,
Part C, 212: 171-181. |
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Fan blade modal
stresses The
use of high-frequency digital reflection photoelasticity has been pioneered
for the evaluation of modal stresses in large fan blades. Recently, the use of thermoelasticity at
high frequencies has been explored successfully and projection moiré or
fringe projection has been employed to determine modal shapes. PATTERSON, E.A., &
TARONI, M., 2003, High frequency quantitative
photoelasticity applied to jet engine components’, Proc. SEM Annual Conf.
Experimental and Applied Mechanics, Charlotte, NC., paper no.5. ESTRADA
ESTRADA, J.R., PATTERSON, E.A., 2004, ‘Path
dependency in thermoelastic stress analysis’, Experimental Mechanics,
44(6):567-574. |
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Airframe stresses in joints & stringers Early work focused on
transmission photoelasticity using two-dimensional and later
three-dimensional models. The
influence of cracks and their propagation paths have also been examined. NURSE, A.D., O'BRIEN,
E.W., PATTERSON, E.A., 1994, 'Stress intensity factors for cracks at fastener
holes', Fatigue Fract. Engng., Mater. & Struct.,
17(7): 791-799. NURSE, A.D., GUNGOR, S., PATTERSON,
E.A., 1995, 'Experimental stress intensity factors for cracks in a thin plate
with stiffeners', Jnl. Strain Analysis, 30(3):
235-240. GUNGOR, S., NURSE, A.D.,
PATTERSON, E.A., 1996, 'Experimental determination of stress intensity
factors of cracks in sheet structures in bolted stiffeners', Engng. Fract. Mech., 53(4):
561-569. |
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NDE
in composites The use of
fringe projection and thermoelasticity the quantification of damage in
composite aircraft panels has been explored successfully. These techniques are non-contacting as
well non-destructive. Whilst fringe
projection offers a viable, exploitable procedure further work is needed on
thermoelasticity. HEREDIA-ORTIZ, M., PATTERSON, E.A., 2003, ‘On the
industrial applications of moiré and fringe projection techniques’, Strain,
39:1-6. HEREDIA ORTIZ, M, PATTERSON, E.A., 2005, ‘Location
and shape measurement using a portable fringe projection system’,
Experimental Mechanics, 45(3):197-204. |
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Aircraft stresses Digital
reflection photoelasticity has been used successful to quantify stresses in
full-scale tests on landing gear and aircraft bulkheads. SIEGMANN,
P., BACKMAN, D., PATTERSON, E.A., 2005, ‘A robust demodulation and
unwrapping approach for phase-stepped photoelastic data’, Experimental
Mechanics, 45(3):278-289. BRAILLY, P., PATTERSON,
E.A., 2004, Stress analysis by digital photoelasticity of a nose landing
gear, Proc. 12th Int. Conf. Exptl.
Mechanics, Advances in Experimental Mechanics edited by C. Pappalettere, McGraw-Hill, Milano,
pp.203-4. |
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