Three blade-stiffened CFRP panels with co-cured stiffener webs,
manufactured by means of an elastomeric mould, have been tested under
compressive load. Several Bragg grating sensors have been surface bonded on
two of the stiffened panels and have been embedded into the stiffener webs
of the third panel. The Bragg grating sensors measured the strain
distribution in the stiffener web and in the skin panels. The bucking onset
was clearly detected in every case, the post-buckling behaviour can be
tracked, but the information is heavily dependent on the right choice of
the sensor position and the buckling mode. To calibrate the system, and to
evaluate the influence of different curing pressures, and the use of
unidirectional or fabric prepreg material, tensile test specimens were made
on flat panels. The strain measurements provided by the optical fibre
sensors in tensile tests were compared with the strain measurements
provided by conventional clamp extensometers.
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