We propose a method to characterize an undeformed double-layer strand with residual stress by considering the deviation from the self-equilibrium configurationwhere torque is balanced without any external forces.We first derive the residual twist defined as the deviation of internal twisting moment in the strand from the self-equilibrium configuration. The residual twist gives a measure of the effective torsional rigidity of the strand, determined by the geometrical, material, and mechanical parameters from the microstructural viewpoint. Then, we correlate the residual twist with the fatigue life of (3+8)-glass strands embedded in a rubber matrix under cyclic bending. We show that the residual twist correlates with the number of cycles to failure for specific (3+8)-glass strands having the identical twist direction.
Acta Mechanica – Springer Journals
Published: Dec 26, 2015
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