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An analytical approach has been adopted to predict the amount of bulk that would develop in a hicomponent fiber having particular geometric distribution of the components of known physical properties. Theoretical expressions have been developed to predict the geometry and mechanical properties of bicomponent struc tures. In particular, an analytical relation has been developed for the radius of the loop of such a structure in terms of strains in the components and their physical dimensions and elastic moduli. The radius of the loop has been related to the bulk ratio. Expressions have also been derived to predict the load elongation relation for the coiled bicomponent structure
El-Shiekh et al. (Thu,) studied this question.