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I am currently performing tensile tests on the Instron 6800 Series single column system at the Engineering Design Lab. I am using the ASTM D638 specimen for my tests, and each is printed out of PLA on the Bambu Lab X1E 3D printer. The software for the Instron has a bit of a learning curve that I am trying to figure out.
For this first round of testing, I printed the specimens with infill percentages in increments of 10%.
I wanted to determine how much the infill percentage correlated with the tensile strength of these dogbones.
I am planning to use an extensometer to determine stress and strain relationships of FDM 3D printed parts. Stress-strain curves results are theoretically identical for a material and independent of the specimen, but since FDM 3D prints are highly anisotropic and nonuniform, the printing parameters and orientations will vastly affect the stress strain curve.
100% infill vs 10% infill
100% infill vs 10% infill
Report.pdfThis is my first test using different infill percentages. The specimen number corresponds to the infill percentage, where specimen 7 has 70% infill. Looking at the results, there is a general trend in both of the charts, that conflict with each other.
The first graph shows that increasing the infill increases the force and the displacement, where specimen 5 is most likely a fluke.
The second graph shows that increasing the infill increases the maximum force but decreases the displacement. There is a notable exception for 100% infill, where it has the high displacement and the highest maximum force. I believe this is due to the nature of 100% infill. The other infill patters use an alternating pattern to support the model from many directions, while the 100% infill has a uniform direction for the infill. The slicer even told me this; it said that the grid infill is not compatible with 100% and that I needed to switch to rectilinear infill.
To fully determine these possibilities, I will be testing many more of these samples to find the general curve for each infill.
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