Testing

Types of testing

• Carbon fiber testing for I shaped panels:

  • Goal: to find the best way to reinforce the joint

  • Experimental and Finite Element Investigations of Damage Resistance in Biomimetic Composite Sandwich T-Joints

• 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’s width 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