# Proof stress of Tool Steel

1. Apr 10, 2010

### aussiebeef

Hi people
need help on finding the proof stress of tool steel after heat treatment can't seem to get it
thanks

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• ###### PTE_Silver_STEEL_After_HT.is_tens.pdf
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2. Apr 10, 2010

### aussiebeef

Please guys struggling on were the .2% proof stress goes

3. Apr 10, 2010

### Astronuc

Staff Emeritus
Is this homework?

One has a load-extension or rather a load-displacement curve, and one needs to plot a stress (a function of load/force and cross-sectional area) and strain (related to the extension/displacement).

What does one know about the definition of proof stress?

4. Apr 10, 2010

### aussiebeef

Proof stress is .2% of the original cross sectional area, then measure line out of the 0.2% strain parallel to the stress/strain line until it hits the stress/strain curve. I think thats what it means but I can't see a curve on the stress/strain line I don't what really to do.

Yeah its homework lol

5. Apr 11, 2010

### Astronuc

Staff Emeritus
One has to transform the load to stress, and the extension to strain.

What is the significance of the specimen showing extension without load increase?

6. Apr 13, 2010

### aussiebeef

i figure it out there is no proof stress due to no curve to you just use the UTS thanks for the help

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