Comparison between 3D Printed Auxetic and Non-Auxetic Structures: Simulation and Experimental Validation

Authors : Josewin Lawrensen; Aamer Nazir; Chi-Pin Hsu

Volume/Issue : Volume 6 - 2021, Issue 9 - September

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In this study, five different auxetic structures were designed into dog bone specimens and printed with approximated similar masses, intended as the constant parameter. These specimens were then simulated by Finite Element Analysis before being subjected to tensile testing. In the simulation, yield stress comparisons between auxetic structures and non-auxetic were analyzed. UTS (Ultimate Tensile Stress) and maximum strain from tensile test results were compared with 3D printed non-auxetic with concentric infill. The results showed agreement between simulation and testing in terms of deformations and failure spots. In the end, simulated auxetic structures showed extensions in yielding limit at a range of 5-20% compared to control. Meanwhile, four out of five tested auxetics were proved to gain increment in UTS value at a range of 25.14%- 160.9% and additional maximum strain percentage by 4.1-31.49% compared to non-auxetic with 10.1 MPa and 2.48%, UTS and maximum strain Respectively.

Keywords : Additive Manufacturing; Auxetic Structure; Finite Element Analysis; Tensile Test; Polylactic Acid.


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