Is it common to assume load distributes evenly amongst all fasteners for a multi row, single shear joint where one plate is carbon fiber and the other plate is a ductile metal? Is this a valid assumption if the metal plate thickness is sized such that bearing yield in the metal plate has the...
I've typically used 4D fastener pitch for single row CFRP joints. The following reference discusses 3D pitch as optimal to maximize the joint strength.
"Critical Joints in Large Composite Aircraft Structure"
https://ntrs.nasa.gov/api/citations/19870001540/downloads/19870001540.pdf
What is...
Hey All,
Is there a good way to increase the bearing capability local to a few fasteners for a single row (double shear)joint with many bolts? The applied line load is concentrated at a few fastener locations, causing them to transfer additional load than the rest.
Current ideas:
1) Use bigger...
What is the typical % difference between tensile/compressive modulus for the widely used carbon fiber material systems?
I've seen values ranging from 0 to 30% from literature and internal M&P test efforts. I understand it can be a difficult parameter to measure and want to understand what is...
Hey all,
Does anyone have a literature source discussing how rapidly composite (carbon fiber) joint capability deteriorates as a function of edge distance? I understand anything less than 2.5D runs the risk of undesirable failure modes occurring. I'm being asked to look at joint with e/D = 1.75...
Are there situations where it is acceptable to forgo a BVID knockdown when calculating ply strength or laminate strength margins? The startup I am employed at (expendable launch vehicle industry) has historically not accounted for a strength knockdown due to impact damage. I understand it is...
