CTOD or COD

Hi Friends,
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.
thanks
Borra
Reply to
Borra
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"Borra" wrote .
Perhaps you could look for books related to fracture mechanics. I remember these are parameters being measured in some experimental fracture mechanics techniques.
John
Reply to
John C
could you please suggest me something to work on this area. i want to do some research work in fracture mechanics and in that CTOD. thanks
Reply to
Borra
"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,
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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.
John

Reply to
John C

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