3D Printing of Automobile Power Transmission System Using Tough PLA
Thapa, Suman (2020)
Lataukset:
Thapa, Suman
2020
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2020061618869
https://urn.fi/URN:NBN:fi:amk-2020061618869
Tiivistelmä
The objective of this thesis project is to design and 3D print a functional automobile power transmission system using a relatively new material called Tough PLA. For simplicity, only spur gears and bevel gears are used in the design. All the parts are designed using SolidWorks 2019 and printed using MakerBot Replicator 5th generation printers. SolidWorks animation and motion analysis are used to create animation and analyse the the torque and angular velocity of each gears. For energy source, a DC motor is used that transfers the rotational motion to all the gears. The results obtained form the motion analysis are very accurate to theoretical calculations. But, the experimental angular velocities are a bit lower. This might be due to uneven cooling of the printed parts that led to lack of clearance and friction between some gears. Experimental verification of angular velocies are done using iPhone slow motion camera.
For testing of material properties, tensile test and flexural test are conducted. The tensile test result shows, the ultimate tensile strength of normal PLA and tough PLA are 55 MPa and 30 MPa respectively and the Young’s modulus are 1.69 GPa and 1.23 GPa respectively. The flexural test result shows, the ultimate flexural strength of normal PLA and tough PLA are 95 MPa and 52 MPa respectively and the flexural modulus are 2.97 GPa and 2.07 GPa respectively. It is clear that normal PLA can handle large amount of load before break compared to tough PLA. But when it fails, it breaks completely, without significant plastic deformation, showing characteristic brittle nature. Whereas, tough PLA undergoes a very long plastic deformation before it breaks. Both the tests suggest that tough PLA has suitable combination of ultimate tensile strength and ductility and can absorb much more amount energy before failure. So, tough PLA can be a material of choice for printing gears.
For testing of material properties, tensile test and flexural test are conducted. The tensile test result shows, the ultimate tensile strength of normal PLA and tough PLA are 55 MPa and 30 MPa respectively and the Young’s modulus are 1.69 GPa and 1.23 GPa respectively. The flexural test result shows, the ultimate flexural strength of normal PLA and tough PLA are 95 MPa and 52 MPa respectively and the flexural modulus are 2.97 GPa and 2.07 GPa respectively. It is clear that normal PLA can handle large amount of load before break compared to tough PLA. But when it fails, it breaks completely, without significant plastic deformation, showing characteristic brittle nature. Whereas, tough PLA undergoes a very long plastic deformation before it breaks. Both the tests suggest that tough PLA has suitable combination of ultimate tensile strength and ductility and can absorb much more amount energy before failure. So, tough PLA can be a material of choice for printing gears.