Abstract
Presented paper deals with experimental study on compressive properties of auxetics with controlled stiffness of strut joints. The variable strut joints properties were simulated by adding extra amount of material in the struts’ intersection regions. Four groups of inverted honeycomb structures were prepared by multi-jet 3D printing and tested in quasi-static compression. The structure collapsed gradually, however after the first collapse, failure in entire cross-section occurred due to the brittle nature of the base material. The behavior up to the first collapse was consistent among the specimens within each group, while differed slightly subsequently. With higher reinforcement in the joints, results showed increasing stress at the first collapse (ultimate compressive stress) while the strain at the first collapse remained unchanged. The auxetic behaviour became less significant with increasing joints’ reinforcement.
Highlights
It has been already shown that cellular solids are able to absorb tremendous amounts of deformation energy [1, 2] during impacts with the possibility to introduce strain-rate dependent characteristics into their deformation response [3]
Certain applications, such as blast and flying debris protection systems, may require material with relatively high strength in addition to excellent deformation absorption capabilities. Such complex mechanical characteristics can be achieved without alteration of the existing lightweight alloys used for the material’s production when the microstructure is constructed in such a way to exhibit negative Poisson’s ratio [4]
Design of the tested auxetic structure was based on our previous study [6], in which first preliminary results were presented
Summary
It has been already shown that cellular solids are able to absorb tremendous amounts of deformation energy [1, 2] during impacts with the possibility to introduce strain-rate dependent characteristics into their deformation response [3] Certain applications, such as blast and flying debris protection systems, may require material with relatively high strength in addition to excellent deformation absorption capabilities. Such complex mechanical characteristics can be achieved without alteration of the existing lightweight alloys (such as aluminium based materials) used for the material’s production when the microstructure is constructed in such a way to exhibit negative Poisson’s ratio [4]. In this paper a parametric study on influence of the strut joint stiffness on the effective deformation response of various auxetic lattices is presented
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