Strength Testing Carbon Fiber Nylon - 3d printed hinge was stronger than the steel test jig!
I did some strength testing of Carbon Fiber Nylon to see if temperature affected the layer bonding, and also to see the difference between Z and XY directions. The Z direction strength was pathetic - just 10% compared to the XY print. I tested the Matterhackers NylonX and Taulman CF Nylon. Their tensile strengths are 100 MPa and 140 MPa respectively. The Taulman was considerably stronger in the XY direction, but no difference in Z direction.
Temperature did improve the strength. I printed them at 245, 265, and 285. 285 was best.
Why was it so weak in the Z direction? What good is it if the layer bonding is so weak?
I also tested a dual axis hinge that I'm developing for a product. It withstood 1700 pounds (770 Kg) of force before the steel test jig failed! So it is sufficiently strong enough..,.
RE: Strength Testing Carbon Fiber Nylon - 3d printed hinge was stronger than the steel test jig!
Layer adhesion is usually better when you use an enclosure. The first photo looks like you printed the parts without one.
RE: Strength Testing Carbon Fiber Nylon - 3d printed hinge was stronger than the steel test jig!
I have an enclosure but wasn't using it because I just got the MMU. I'm going to mount the MMU on the side to fit it in the enclosure. I'll try that.
I did an earlier round of stress testing with smaller hooks and found that the ratio between Z and XY was 20% (with the enclosure) which is better, but not great. I guess I need to plug the holes in my enclosure to trap more heat.
Print settings:
15% infill for the big hooks, 50% infill for the small hooks, 100% infill for the hinge. Maybe the infill improved the layer adhesion..
And the hinge was printed tilted up 45 degrees so the layer lines were distributed between X and Z.