- This journal paper is about the results from testing of poly carbonate that was printed using a Fused Deposition Modeling printer. The team tested several orientations of print pattern in order to map the failure modes in the sample through each orientation. Tension, hardness, and density measurements were taken and from this the yield strength, tensile strength, percent elongation, elastic modulus, hardness and density were measured as a function of raster angle. The team found that the properties of the material were highly dependent on the raster angle. In addition, they also found that testing and analysis methods used for composites also apply to FDM materials and that the failure modes found in the printed material are similar to those found in fiber reinforced composites. Another finding of the paper was that a raster angle of 90 degrees provides for the highest possible tensile strength. This strength was over 4 times that of a raster angle of 0 degrees. In fact, the 90 degree raster angle was the best from every metric.
Citation:
Nevin Hill , Mehrdad Haghi , (2014) "Deposition direction-dependent failure criteria for fused deposition modeling polycarbonate", Rapid Prototyping Journal, Vol. 20 Iss: 3, pp.221 – 227
- Similar to the previous journal article, this one also examines the effect of the orientation a part printed using the FDM printing process. In this case, the orientations tested related to the build path of the test samples. Samples were built in the X, Y, and Z planes and tested against one another. The tests used were compression and tensile tests. The researchers found that in the build path does affect the properties of the samples and also found that the software used by the machine was not perfect at rendering an object. In addition, they found that the tests were fairly consistent as long as the tip of the printer was changed frequently
Citation:
http://www.stratasys.com/~/media/Main/Files/FDM%20Test%20Reports/FDM%20Part%20Quality%20Manufactured%20with%20Ultem.pdf