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Comparison of Charpy's at different energies and temperatures

Comparison of Charpy's at different energies and temperatures

Comparison of Charpy's at different energies and temperatures

(OP)
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.

RE: Comparison of Charpy's at different energies and temperatures

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

RE: Comparison of Charpy's at different energies and temperatures

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

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

RE: Comparison of Charpy's at different energies and temperatures

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.

RE: Comparison of Charpy's at different energies and temperatures

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

RE: Comparison of Charpy's at different energies and temperatures

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

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