Of 0.04 s-1. Figure 6 shows applying a universal uniaxial compression tester having a strain

Of 0.04 s-1. Figure 6 shows applying a universal uniaxial compression tester having a strain price of 0.04 s-1 . Figure six shows the experimental setup for the compression testing. The force response for the duration of compresthe experimental setup for the compression testing. The force response during compression sion was captured having a force sensor as a function in the displacement with the hydraulic was captured using a force sensor as a function of your displacement in the hydraulic pressing pressing punch, which was measured with a linear potentiometer. The Goralatide Autophagy measurements punch, which was measured having a linear potentiometer. The measurements have been captured had been captured by signifies of a data acquisition system, and the experiment was repeated by signifies of a information acquisition program, as well as the experiment was repeated 3 times for three times for every single auxetic sample sort to ensure the repeatability in the recorded measeach auxetic sample sort to make sure the repeatability in the recorded measurements. urements.Figure six. Experimental setup for compression testing of auxetic samples. Figure 6. Experimental setup for compression testing of auxetic samples.4.two. Experimental Final results Figure 7 illustrates the force-displacement measurements for PLA, PET, TPU supplies created by FDM and PA12 material by signifies of PBF. All four components JNJ-42253432 site showed strongAppl. Sci. 2021, 11, x FOR PEER REVIEW9 ofAppl. Sci. 2021, 11,four.two. Experimental Results9 ofFigure 7 illustrates the force-displacement measurements for PLA, PET, TPU supplies produced by FDM and PA12 material by means of PBF. All 4 materials showed powerful reproducibility. The Duraform Flex rubber 3D sample produced by SLS demonstrated only reproducibility. The Duraform Flex rubber 3D sample made by SLS demonstrated only minor force response (much less than 22N) because of extremely low all round stiffness. Because the measuring response (much less than N) as a result of incredibly low all round stiffness. Since the measuring accuracy on the available force sensor was unable to capture forces of that range, the results the accessible force sensor was unable to capture forces of that range, the refor this material are omitted. sults for this material are omitted.600 PLA1 500Force, F [N]Force, F [N]350 PET1 300 250 200 150 one hundred 50 0 PET2 PETPLA2 PLA300 200 100 0 0 10 20 Displacement, [mm] 3020 30 Displacement, [mm]80 TPU1 70 60 TPU2 TPUForce, F [N]45 40 35 30 25 20 15 10 5 0 PA12_1 PA12_2 PA12_Force, F [N]50 40 30 20 10 0 0 20 40 Displacement, [mm]20 30 Displacement, [mm]Figure 7. Experimental measurements of force vs. displacements on auxetic samples. Figure 7. Experimental measurements of force vs. displacements on auxetic samples.The experimental study for the 2D auxetic geometries has shown that PLA samples The experimental study for the 2D auxetic geometries has shown that PLA samples deliver the highest stiffness and force response, due toto their high elastic modulus, comprovide the highest stiffness and force response, due their higher elastic modulus, when compared with the other supplies tested in in this experiment. The experiments showed that pared to the other supplies tested this experiment. The experiments showed that bebetween 15 mm andmmmm of travelled compression distance of punch, the FDM 2D tween 15 mm and 20 20 of travelled compression distance of punch, the FDM 2D samsamples (PLA, PET, and TPU) developed a rise ingradient. This This elevated stiffness ples (PLA, PET, and TPU) developed a rise within the the gradient. elevated stiffness in in samples was.