Jh. Yim et Bz. Jang, Prediction and experimental verification of damping in 3-D braided textilestructural composites, POLYM COMP, 20(5), 1999, pp. 664-674
The material damping characteristics of 3-D braided textile structural comp
osites were investigated in this paper. A model for predicting damping in t
hese materials was developed based upon the classical laminated plate theor
y. The model modified the existing models for predicting the static moduli
of 3-D textile structural composites by using the elastic-viscoelastic corr
espondence principle. The basic engineering constants were replaced with th
eir corresponding complex forms by applying the elastic-viscoelastic corres
pondence principle to them. In this study, the basic damping loss factors (
i.e. eta(L), eta(T), eta(LT) and eta(upsilon LT)) were obtained by a modifi
ed Hashin's theory, Rule-of-Mixture Laws, and an indirect method on the bas
is of empirical works. From complex numerical results, we concluded that ax
ial damping, flexural damping, coupling damping, and in-plane shear damping
coefficients were all functions of the yarn orientation angle and fiber vo
lume fraction in 3-D braided textile structural composites. Experimental da
ta supported theoretically predicted results.