Unfolding process of coiling fibers made by instability-assisted fused deposition modeling

Abstract eng:
Microstructured fibers with sacrificial bonds fabricated by instability-assisted fused deposition modeling (IFDM) exhibit high toughness and stretchability. However, early breakage of backbone hinders the fiber from achieving higher toughness. Finite element analysis using ANSYS was performed to analyse the unfolding process of a single coiling loop under uniaxial force. Results show that maximum von Mises stress is found at the inner side of the previous top loop, which corresponds with the location of fiber breakage from experiments. Bending continues to be the dominant factor for maximum stress during the unfolding process. Torsion contributes more to maximum stress with decreasing fiber slenderness. The stress analysis of the unfolding process would help to optimize the fiber production by reducing maximum von Mises stress to avoid early breakage of backbone. We hope that microstructured fibers made with IFDM could one day be used for safety-critical applications, such as safety harness or bulletproof vests.

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