Material Models Database?

[qwicker]

Hi,

I was wondering if anyone knew any places to get raw data for standard materials. For example, I am trying to investigate contact deformation of Steel 4340 (standard material) but the stresses get way to high for the linear models that Ansys accepts. I have used the TB command before and this is what I want to do now.

I just dont want to have to run tests to get material stress/strain data. It seems like there should be a relatively easy place to get this data on the web!

Thanks!!!

 

[Stringmaker]

Mil-HDBK-5 would be a good start. Most companies have proprietary databases of material properties so I doubt this info will be easy to come by. Depending on your application it may pay to invest in some testing!

 

[qwicker]

Hmm, OK. I was hoping stress/strain data was available somewhere so I could create my own curve. Data for a common steel shouldnt be so difficult to come by I would think.

I prefer to always use a detailed nonlinear model when I am expecting higher deformations.

 

[Struct71]

What is your "normal steel"?

You can use theoretical ramberg-osgood or practical stress-strain curves from literature.

 

[qwicker]

Anything like Steel 4340... Any kind of industrty "standard" metals. I think I may do some of my own tensile testing and make my own database.

Is it always better to use a nonlinear model in conjunction with the linear model (such as multilinear kinematic or bilinear hardening)? Will this always yield better results, especially when large deformation is expected?

 

[Transient1]

What is better results? If you mean more realistic results, then you must account for plasticity if you exceed the yield point. Things get tricky around stress discontinuities, they sometimes exceed the yield point but in reality the FEA model is over predicting the stress. As always in FEA you have to understand the theory behind the "magic black box".