Styrkan av 3D-utskrivna kompositer

Abstract

Additive manufacturing has become very popular in the past decades. Both for companies that work with product development to streamline agile prototyping and for people that 3D-print at home. The scope of 3D printing is not just for rapid prototyping anymore, but also for end products. This has put a higher demand on materials and material data for end user products. This study follows the work done on testing and analyzing 3D-printed composites. The material investigated in this report is polyamide 66 with 20% chopped carbon fiber reinforcement. All specimens were printed on a ZYYX Pro 3D-printer. ZYYX has a set of standard settings for their 3D-printers that were tested in different orientations on the print bed for test specimens to be close to final 3D-printed models for end use. 10 test specimens in 4 different X, Y orientation and 5 test specimens in Z direction were tested. With a tensile test machine Young’s modulus and ultimate strength could be determined. The test results showed that there is a difference in properties related to print orientation where printing with longitudinal and transverse mesh over the test specimens gives the possibility to reache highest Young’s modulus and ultimate strength values. During the testing a difference in material data was noted for identical print specimens. This was investigated and proved to be related to ageing of the material after printing. In fact, in this project up to 50% decrease in Young’s modulus from 3 weeks of ageing was shown