Deformation-activated polarization-selective negative group velocity in rectangularly-arranged fiber-reinforced soft composite
Yao, Qi Rudykh, Stephan
Yao, Qi
Rudykh, Stephan
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Publication Date
2025-11-25
Type
journal article
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Citation
Yao, Qi, & Rudykh, Stephan. (2026). Deformation-activated polarization-selective negative group velocity in rectangularly-arranged fiber-reinforced soft composite. International Journal of Solids and Structures, 326, 113785. https://doi.org/10.1016/j.ijsolstr.2025.113785
Abstract
This paper demonstrates the deformation-activated negative group velocity (NGV) state in soft fiber-reinforced composites (soft FCs). We exhibit the mechanism of inducing the NGV state in the vicinity of buckling. Based on extensive simulations, we construct a map of NGV intervals versus deformation level and fiber spacing ratio, revealing clear trends and tunable behavior. In the transition region of buckling direction, NGV states can be selectively activated for shear waves with different polarizations. The presence and order of NGV polarizations are found to correlate with the direction of post-buckling fiber morphology. NGV states in both polarizations indicate non-principal, helical buckling patterns and complex evolutions. The relative width of NGV intervals of two polarizations mirrors the magnitude of helical deformation in each direction. These findings suggest NGV behavior as a predictive indicator for post-buckling configurations. This work offers a new pathway for understanding NGV states in soft FCs, with potential applications in reconfigurable materials.
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Publisher
Elsevier
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CC BY