Any body working on Crack Opening Displacement or Crack Tip Opening
Displacement. Please let me know i am want more information on this
topic specifically, suggetions are welcome.
"Borra" wrote .
It was more than 30 years ago that I came across COD and CTOD, and I am by
now retired. I faintly remember that measuring COD is not as good as CTOD
for ductile materials as the plastic yield zone is around the crack tip.
The material with the crack is placed under increasing tensile load opening
the crack. They insert a clever little devise (like a tiny screwdriver)
deep into tip of the crack and measure how much this devise can rotate to
see what is the crack tip displacement. I think at a certain threshold
displacement the crack would propagate (or something like that).
As I said, this was more than 30 years ago, and I am sure there should be a
lot more research and advances on this.
Anyway, nowadays (unlike the slow moving old days), the quickest way to find
out more is through a Google search,
Just now I have just
typed in CTOD and have got many hits with useful write-ups, including the
theory and the relation of CTOD with fracture toughness.