Revolutionary advances have been observed in lattice structure fabrication, which is a unique capability of additive manufacturing. In particular, lattice structures have been employed to regulate the mechanical properties of metals and polymers. In this work, the true impact of lattice structures on superelastic behavior was experimentally investigated. Finite element analysis was also used to evaluate the stress and displacement of lattice structures. Nylon-12 is an elastic polymer that does not typically demonstrate superelastic behavior. The HP Multi Jet Fusion method was used to fabricate three different lattice structures: a soft box (BSL), X shape, and rhombic dodecahedron (RDL). Mechanical tests showed that BSL was able to recover 30.697% of the strain in the first compression cycle and 66.233% in the fifth compression cycle, which is impressive for a non-superelastic material. The reduced possibility of yield failure, lower Young’s modulus, and low stiffness of SBL increased its strength. SBL displayed better superelastic behavior with the lowest Young’s modulus among the three lattice structures. This study not only designed and tested lattice structures but also compared the superelastic performances of selected lattice structures.
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Kankanamge, U.M.H.U., Mohamed, O.A. & Xu, W. Superelastic Behavior of Additively Manufactured Nylon-12 Lattice Structures. J. of Materi Eng and Perform 30, 9352–9358 (2021). https://doi.org/10.1007/s11665-021-06086-4