I will be presenting at MS&T 2018, Ohio

Özgür Keleş, Eric Anderson, Jimmy Huynh, Jeff Gelb, Jouni Freund, Alk Karakoc

 

 

Consumer level fused deposition modeling (FDM) systems have been used for production of open-source free designs that contain intentional porosity. Despite the increasing use of FDM, the effect of porosity on the mechanical behavior of FDMed short-carbon-fiber-reinforced composites are unclear. In this talk, we will discuss the effect of internal porosity and extrusion tip vibrations on the mechanical properties and mechanical reliability of the FDMed composites containing up to 50 vol. % porosity.  Seven batches of thirty specimens were tensile tested at different porosity levels, a total of ~210 tests.  Weibull statistics was used to quantify variations in the mechanical properties. A novel and inexpensive extrusion tip vibration technique was used eliminate road-to-road porosity, which resulted in an increase in both fracture strength and its Weibull modulus from 23 to 54 for dense samples. The resulting microstructures were investigated using X-ray computed tomography and scanning electron microscope.