EFFECT OF CRYOGENIC TREATMENT ON STRENGTH AND WEAR BEHAVIOR OF 3D PRINTED SAMPLES

This study investigates the effect of Deep Cryogenic Treatment (DCT) on 3D printed standard tensile test (ASTMD638) and wear test (ASTM G99) samples of Polylactic Acid (PLA). The parameters considered in this study areRaster Angles (RA) of 0°, 90°, 0°&90° with constant layer thickness of 0.3mm, a line pattern with 100% infill density.The cryogenic treated (CT) and untreated (RT) 3D printed PLA tensile test samples are tested on Instron UniversalTesting Machine and the wear responses of the same thermoplastic are performed on Pin on Disc wear testing machineat a constant load of 20N and disc speed of 700rpm. The test results showed that the CT samples with an RA of 90°exhibited 85% more tensile strength and the samples with RA 0°&90° showed 83% reduction in wear than untreatedsamples. It is also observed that the magnitude of coefficient of friction and frictional force of CT samples issignificantly less as compared to untreated samples.