engineering stress-strain --> true stress-strain? 3

[salmon2]

Hi experts,

I am wondering if I can interpret engineering stress-strain data to get true stress-strain curve? It seems possible but I haven't got everything clear in my head. Wondering if anyone can educate me a little or point me to any available standard or practice?

I am not looking for a full true stress strain curve, a bilinear curve is fine - meaning two linear sections with only one yield point and one frature point. For steel or metal. Assume I have ys,uts, e and RA.

Thanks,

Salmon2

 

[arunmrao]

Do you have "Mechanical Metallurgy" by Dietert? Reading the first few pages,will clear most of the confusions that you have.

 

[salmon2]

Arun, thanks a lot for the pointing. Unfortunately, I don't have that. But I just read online a bit, seems like it is possible to get true stress strain curve up to necking begins if know ys, uts and the elongation uts. Seems like final elongation and RA are not helpful at all in this practice. My problem right now is that I don't know the elongation for uts point.

Is my understanding correct?

 

[salmon2]

Any discussion or experience are welcome.

Happy holidays to everyone. I don't have time to be here a lot, but I think this is the best engineering forum. Hats off to all the experts.

 

[arunmrao]

salmon2 wish you the same. Come back as often as you want. But please get hold of the book by Dieter,it is not an expensive one and will remain your companion for life.

 

[hydtools]

This may help:

http://web.mit.edu/course/3/3.11/

http://www/modules/ss.pdf

Ted

 

[salmon2]

Thanks arunmrao, I have checked it out online. Thinking to get a used one or papercover one. The brandnew hardcover one is a bit steep for me.

My problem is to design a tool --> I wrote a material Spec
for it where I can only define minimum ys, uts, e, RA in a tranditional way --> then I want to run some FE stress analysis to verify if it will work --> FEA asks for true stress strain curve to get more reliable results (I do have several localized high stress beyond yield point). So I need to translate my material Spec to a true stress strain curve if possible.

 

[salmon2]

hydtools, thanks for the pointer. I was reading the exact paper last night, very carefully. Thanks a lot.

 

[mcguire]

You can find Dieter on Google Books.

http://books.google.com/books?id=Hs...=metal fracture under combined stress&f=false

Michael McGuire

http://stainlesssteelforengineers.blogspot.com/

 

[salmon2]

mcjuire, thanks a lot, I will take a look at this one. You guys are best.