Tensile Strength Test Specimens

thingiverse

UPDATE 2: New models are posted!http://www.thingiverse.com/thing:1993441 UPDATE: I am designing a newer, much better testing machine and will be designing all new test pieces to go with it. I'll post those also, but will leave this here in case anyone wants to compare against my earlier videos. ORIGINAL: In case anyone wants to reproduce my tests on their own machines, here are the specimens I’ve been using for my videos where I've tested the tensile strength of different filaments. If you do some testing, please let me know how it goes! There are two designs here: (1) To be printed standing up tall for testing the bonding strength of the layers. It’s the bigger piece with the wider bottom so that it has an easier time sticking to your bed. You’ll also notice the piece is just bulkier all around, because occasionally I would have odd failure at the holes rather than the center, where it’s meant to break. (2) To be printed flat against the table to test more directly the extruded tensile strength of the filaments. The center cross section is meant to be 0.2” x 0.2”, but you’ll want to measure it with a pair of calipers first before breaking. Divide the breaking strength measured by your scale to get the tensile strength (in psi or MPa). Here are the videos that they were used in: Nylon 910https://youtu.be/48NC0KDmcBo ABShttps://youtu.be/JXeeRhoriIo PLAhttps://youtu.be/cOW34xhtNM8 PETGhttps://youtu.be/z7rTwPCygtM