Abstract
In this study, a new experimental device of rotary bending test for filaments was proposed, and the mechanical behaviors of the contact, movement, and release of filaments under rotary bending were investigated. According to the experimental results, the maximum load of a bundle of filaments could be estimated by considering the geometry interaction of filaments. The cumulative energy based on load and rotation angle was calculated, and the correlation between the energy and the number of filaments in the case of various filament diameters and pushing length was estimated. Furthermore, the energy was divided into two energies (EI, EII). The energy EI is dominated by the effect of impact and decomposition, and the energy EII is influenced by the sweeping phenomena. It is obvious that EI and EII have trade-off relationship due to effects of pushing length. From the results, we believe that the proposed method is useful for design of the products composed of filaments because effects of design parameters of filaments on mechanical characterization can be estimated conveniently.
