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Carbon fiber testing for I shaped panels: Goal: to find the best way to reinforce the joint
Fastener pull through strength
https://scholarsmine.mst.edu/cgi/viewcontent.cgi?article=1393&context=isccss
there is a super hacky way of testing pull through strength in this document, basically testing out washer, grommet, big head fastener, etc. that can be used to help
Adhesive
DP-420 Black, honestly check if it even works
Get experimental values for the following material properties of the adhesive (in order of priority): Tensile Strength, Shear Strength
Tensile Strength: Butt Joint
Link: http://www.adhesivestoolkit.com/Docu-Data/NPLDocuments/P A J/Measurement Notes/CMMT(MN)9 butt-joint.pdf
Shear Strength: Single Lap Shear Test following ASTM D5868
Link to ASTM D5868 document: http://composites.ir/wp-content/uploads/2017/11/D5868_01.pdf
Ideally this would be done on Carbon Fibre substrates to get the most accurate values for our application
Potentially could use the test coupons from the resin infusion process - that way they can have dual use for us
if there is any other alternatives for cf to cf panels that would be nice
Shear out
see how much force it takes to completely shear/slightly damage out of the carbon fiber panel
In-Plane (Edgewise) Compressive Composite Failure Modes
Panel Shear Crimping
Face Wrinkling
Ideally this would be done on a test piece that has a hole for a bolted joint (in hand calculations it’s been assumed the test piece is only the diameter of the hole for the bolted joint)
Then can more accurately determine how much loading will cause those two failure modes to occur