Comparison of Charpy's at different energies and temperatures

[Ussuri]

Is there any way to compare V Notch Charpy tests?

The commonly available steel (to BS EN 10025) is tested at 27J at -20 degrees. The design code requires 35J at -5 degrees. Is there an approximation which would allow you to say that a 27J impact at -20 deg would similar to a ??J at -5 deg?

We have a materials department who will ultimately resolve this and probably get it tested but I wondered if there was a go by which is used as an indication. This is for my own benefit more than anything else.

 

[metengr]

No, you need to compare either full Charpy V impact curves or actual test data points.

 

[EdStainless]

Doesn't work that way.
Now if it met 35J at -20 you would be home free.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[SJones]

The only standard that I have seen that would allow you to do this for those energy and temperature requirements is BSI PD 5500 for pressure vessels.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[Ussuri]

OK, thanks for your help. I'll just leave to the professionals to deal with.

 

[Guest102023]

Off the record I would say probably, but legally I would say you have no hope of making that claim.