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A flexible concentric coupled re-entrant-star composite structure with enhancing negative Poisson's ratio and
Mengting Zhao1, Junli Chen2, Xiaojing Wen2
1School of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306, China.
None:
A flexible concentric coupled re-entrant-star (CCRS) composite structure is proposed to address the premature instability of a re-entrant honeycomb (RH) structure and the limited load-bearing capacity of a flexible star-shaped honeycomb (SH) structure. To elucidate deformation mechanisms, mechanical performance, and Poisson's ratio response, systematic comparative studies between the CCRS and conventional RH and SH were conducted, including uniaxial tension and cyclic loading. CCRS simultaneously exhibits a pronounced negative Poisson's ratio of -0.7 and markedly enhanced mechanical performance, outperforming RH by approximately 1.5 times and SH by about 3 times, while maintaining high deformability with fracture elongation exceeding 1060% and a stable cyclic recovery of about 96% even at a strain of 180%. These performance enhancements arise from an inner star-shaped unit that drives lateral expansion at low strain and an outer re-entrant hexagonal unit that provides load-bearing constraint at high strain, thereby producing more uniform stress distribution and suppressing local buckling. Consequently, CCRS offers an effective design strategy for architected soft matter systems requiring large deformation and enhanced load-bearing capacity.
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