Question about Rp... 2

[Airman23]

Dear cybermen and cyberwomen,
I wish want ask a very simple question to you , I hope that someone answer me as soon as possible!!
Is there one formula that it converts Rp(0,2)t into Rp(1,0)t for austenitic steels, for example?
If it thereisn't, how I do to obtain the value of Rp(1,0)t of these materials?
Thanks to everybody that I will answer me.

---------------------------------------------------
---------------------------------------------------
Eng. Antonino Nicosia

my website: web.tiscali.it/aeronavigandosulweb

 

[metengr]

23021972;
The terms Rp (1.0) and Rp(0.2) refer to proof (tensile yield) stress values at 1% and 0.2% permanent deformation, respectively. These values are determined from standard tensile tests, and there is no conversion formula.

 

[Airman23]

Thanks metengr
but I know it, I ask you if there was some particular formula to compute this conversion...do you know Roark's formulas for structural field? I searched something of similar...

 

[metengr]

To obtain Rp(1.0) values, you need to coduct tensile tests and obtain this data at 1% strain.

 

[CoryPad]

There is no specific formula to convert among proof stresses at varying strain levels.

If the material follows a hardening law (like Holloman), then you may be able to use that.

Use an Internet search engine and look for Holloman, strain, hardening.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[Airman23]

thanks!

Eng. Antonino Nicosia
Aeronautical Engineer specialized in Fluid Power field.

my website: web.tiscali.it/aeronavigandosulweb
(in the future there will be many programs about fluid power problems, thermal and structural problems)