Learning Forum

[Nabuzor]

Hello all,

I am facing a problem of obtaining good material data input for my simulations. I would like to work on calculating stresses and strains of elements made of forged brass. Unfortunately, no manufacturer provides mechanical data for forgings, only for brass bars in different delivery states. However, I have an access to data (force - elongation graphs) obtained in an experiment where the forging itself was subjected to tension.

Therefore I would like to ask if there is a way I could somehow replicate this test in simulation in order to retrieve an approximate stress - strain data for the material properties for future simulations? If yes, how should I proceed with material settings in such test replication?

I will be thankful for any answers.

All the best!

[Ashish Khemka]

You can try converting the force-elongation data to stress-strain data and then define the relevant material model.

Regards Ashish Khemka

[Nabuzor]

I am not sure how to do it excatly - as I wrote, I am dealing with forging and it has a non uniform shape with varying cross sectional area, far from being round. In such case I do not know how to convert force data into stresses - do you have any specific way of doing that on mind?

All the best!

[David Mercier]

To convert force data into stress data, you need to know the specimen section. The relationship is Stress = Force / Area. And for the strain it is the elongation over the initial specimen length: Strain = Elongation / Initial length

[jonsoln]

Hello!

I don't think you will be able to create stress-strain data more than in the elastic range from a general force-displacement experiment with an irregular specimen. You could estimate the young's modulus though.