Material Property: Fracture Toughness

[interface222]

Could anyone point me to a formula or other relation that specifically relates Notched Izod Impact Strength [J/cm] to Fracture Toughness [MPA-m^1/2]. If it also relates Charpy I'd consider it a bonus.

Is this a direct relation? Is fracture Toughness derived from the Izod or Charpy testing methods?

I've done some online and offline searches but no formulas are presenting themselves.

Thanks in advance.

 

[henri2]

You are dealing with stress intensity factors here...fracture mechanics. No direct relationship.

Do a search in eng-tips. This has been discussed in several threads.

http://www.google.com/custom?domain...000000;GFNT:0000FF;GIMP:0000FF;FORID:1;&hl=en