R. Ahmadian et Pr. Mantena, MODAL CHARACTERISTICS OF STRUCTURAL PORTAL FRAMES MADE OF MECHANICALLY JOINED PULTRUDED FLAT HYBRID COMPOSITES, Composites. Part B, Engineering, 27(3-4), 1996, pp. 319-328
The primary objective of this investigation is to analyze and compare
the dynamic behavior of framed structures made of orthotropic material
s manufactured by the pultrusion process. Pultruded flat beams made of
glass/epoxy, graphite/epoxy and various lay-up combinations of hybrid
glass-graphile/epoxy are used to produce high-modulus and lightweight
, L-shaped, portal frame and other composite material structures. The
dynamic properties of the decoupled and mechanically fastened coupled
structures were obtained by the experimental modal analysis technique.
The structural properties identification process for each of the beam
and lumped systems consists of generating the frequency response func
tions (FRF), estimation of natural frequencies, damping, and the assoc
iated mode shapes. A measurement chain comprising a dual-channel dynam
ic signal analyzer, corresponding instruments and a modal analysis sof
tware package has been used for identifying the modal parameters. The
experimental results demonstrate the applicability and dynamic superio
rity of structures made with pultruded hybrid composite materials.