Review of mechanical properties and impact response of PLA auxetic structures

Abstract

In this paper, mechanical properties under quasi-static loading conditions and low to high-velocity impact response of Poly-lactic acid (PLA) material produced by the Fused Deposition Modeling (FDM) 3D printing method, having auxetic and non-auxetic geometric structures are critically assessed. Specifically, the load–displacement curve under various loads and parameters, such as energy absorption and the existence of the NPR effect with varying applied loads, are investigated. The effect of a large collection of material parameters, process parameters, and geometrical effects on load–displacement curves, strength, stiffness, and energy absorption are discussed in detail. The in-depth studies on auxetic structures of PLA, for quasi-static compressive load and low to high-velocity impact load, have shown that its impact resistance is superior to that of its non-auxetic counterparts. Also, a method for predicting peak load and maximum displacement for low-velocity impact derived from quasi-static loading data is discussed.