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Study on a Chiral Structure with Tunable Poisson's Ratio
Yanming Fu1,2, Tianbiao Yu2, Xin Wang3
1Laboratory Management Center, Shenyang Sport University, Shenyang 110102, China.
Abstract:
A chiral structure with a negative Poisson's ratio containing a hollow circle with varying diameters was designed, and the finite element method was used to investigate the variation in the Poisson's ratio when the hollow circle diameter was varied (d = 0, 1, 2, 3, and 4 mm). The simulation results showed that the Poisson's ratio was sensitive to the hollow circle diameter, and the minimum Poisson's ratio was -0.43. Three specimens with different hollow circle diameters (d' = 0, 1, and 3 mm) were 3D-printed from thermoplastic polyurethane, and the Poisson's ratio and equivalent elastic modulus were measured. In the elastic range, the Poisson's ratio increased and the equivalent elastic modulus decreased as the hollow circle diameter increased. The simulation and experimental results showed good agreement. The proposed structure is expected to be applicable to protective sports gear owing to its high energy absorption and the fact that its properties can be modified as required by adjusting the geometric parameters of the unit cell.
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