Effect of Chiral Arm Angle on the Stiffness, Auxeticity and Energy Absorption of Polyamide-12 Tetra-Chiral Lattices Under Quasi-Static Compression: A Numerical Baseline Study
- 1Department of Mechanical Engineering, Osmaniye Korkut Ata University, 80000 Osmaniye, Türkiye
- 2Department of Mechanical Engineering, Faculty of Engineering, Firat University, 23119 Elazığ, Türkiye
Abstract
Chiral auxetic lattices convert axial loading into node rotation, producing negative Poisson’s ratios and high energy absorption. This purely numerical study establishes a quasi-static baseline for additively manufacturable polyamide-12 (PA12) tetra-chiral lattices in which the chiral arm angle (0–90°) is treated as a design variable; no experiments were performed, and the model is verified rather than validated. Geometrically non-linear elastoplastic finite element analyses with a data-sheet-derived bilinear PA12 card and frictional self-contact were carried to 20% nominal strain and supported by mesh convergence, seeded-imperfection and friction sensitivity studies, a full-field lateral-strain measure and a refined sweep at 5° resolution. The arm angle switches the response between a stretch-dominated non-auxetic regime (0°, 50–90°) and a rotation-dominated auxetic regime (15–45°) whose lateral kinematics are not sensitive to mesh density, friction and seeded imperfections. The 15° lattice maximizes stiffness and peak force but is an isolated spike in the refined sweep, exhibits a collapse-mode bifurcation whose branch is selected by the discretization, and reaches the PA12 ductility limit after 3.5 mm of stroke. The 30° architecture sustains 9.4 mm before fracture onset and delivers the highest damage-bounded specific energy absorption of the auxetic window (820 J/kg on the baseline mesh), emerging as the design optimum.
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BibTeX
@article{arıkan2026effect,
title = {{Effect of Chiral Arm Angle on the Stiffness, Auxeticity and Energy Absorption of Polyamide-12 Tetra-Chiral Lattices Under Quasi-Static Compression: A Numerical Baseline Study}},
author = {Volkan Arıkan and Cenk Yanen},
journal = {Polymers},
year = {2026},
month = oct,
doi = {10.3390/polym18192427},
url = {https://europepmc.org/article/PMC/PMC13666711},
note = {CC BY},
}
RIS
TY - JOUR
TI - Effect of Chiral Arm Angle on the Stiffness, Auxeticity and Energy Absorption of Polyamide-12 Tetra-Chiral Lattices Under Quasi-Static Compression: A Numerical Baseline Study
AU - Volkan Arıkan
AU - Cenk Yanen
PY - 2026
DA - 2026/10/01
JO - Polymers
DO - 10.3390/polym18192427
UR - https://europepmc.org/article/PMC/PMC13666711
AB - Chiral auxetic lattices convert axial loading into node rotation, producing negative Poisson’s ratios and high energy absorption. This purely numerical study establishes a quasi-static baseline for additively manufacturable polyamide-12 (PA12) tetra-chiral lattices in which the chiral arm angle (0–90°) is treated as a design variable; no experiments were performed, and the model is verified rather than validated. Geometrically non-linear elastoplastic finite element analyses with a data-sheet-derived bilinear PA12 card and frictional self-contact were carried to 20% nominal strain and supported by mesh convergence, seeded-imperfection and friction sensitivity studies, a full-field lateral-strain measure and a refined sweep at 5° resolution. The arm angle switches the response between a stretch-dominated non-auxetic regime (0°, 50–90°) and a rotation-dominated auxetic regime (15–45°) whose lateral kinematics are not sensitive to mesh density, friction and seeded imperfections. The 15° lattice maximizes stiffness and peak force but is an isolated spike in the refined sweep, exhibits a collapse-mode bifurcation whose branch is selected by the discretization, and reaches the PA12 ductility limit after 3.5 mm of stroke. The 30° architecture sustains 9.4 mm before fracture onset and delivers the highest damage-bounded specific energy absorption of the auxetic window (820 J/kg on the baseline mesh), emerging as the design optimum.
SN - 2073-4360
ER -