I need help on finding sources on a research paper.

The subject is(strain hardning test).

saif, hi... strain what? Can you please clarify what your subject is? Does it have to do with physics or chemistry?

Thanks for your asking

It is about physics

Stress-strain curve , steel hardning and machines used for that test.

Hi wrong subject wrong moment

I don't have any research paper on strain hardening, but I can give you the procedure how to find out the strain hardening exponent from your load-displacement data. If you are loking for one of the research papers, I think it should be from 50's or 60's. If you need the procedure, let me know.
Good luck