General Mechanical

General Mechanical

Endplate Steel Connection – Experimental X Ansys Analysis

    • Fabricio.Urquhart


      I am trying to do a benchmark, analysing to add in my master thesis. But I am in front of some problems. The epxerimental analysis shows higher stiffness than the FEA Analysis.

      I think that I am doing something wrong, about the value of stiffness factor. I think that is necessary to calibrate this coefficient.

      What do you think about? See the graph below.

    • peteroznewman

      Hello Fabrico,

      Please explain what you mean by stiffness factor.  Is that in the contact definition?

      What is   LIMITE P/ RIGIDA?

      Please insert an image of the model showing loads and boundary conditions.

      Was the material used in the experiment tested to obtain stress-strain data?

      What was the measured thickness of the parts in the experiment?

      Please show an overlay of the experimental material stress-strain curve and the FEA material stress-strain curves.

      I assume the experimental data actually measured force and deflection. If you plot what was measured and overlay the same measurement from the FEA, that is one less source of error.


    • Fabricio.Urquhart

      Hello Peter.

      Yes the stiffness factor in the contact definition. "LIMITE P/RIGIDA" is the graph plotte by Eurocode-3 (2010), I showed it, only to  have the idea, if the connection is rigid or flexible.

      The load applied and the boundary condition you can see in the pictures below:


      The experiment/PHD thesis and the previous work (master thesis) are attached. The material stress-strain curve you can see in page 187 of PHD thesis. The comparation you can see in the master thesis page 172.

    • peteroznewman

      I recommend you perform sensitivity studies on all the factors that you believe have an effect on the curves.

      For example, solve a model with a 20% change in:

      • Normal Stiffness Factor in the Contact definitions

      • Stress values in the Mulitlinear material table

      I anticipate the curve will move very little for the 20% change in Normal Stiffness Factor and it will move much more for the 20% change in the material stress.

    • Fabricio.Urquhart

      Thank you Peter, I will do it.

      I tried to use the values below, recommended ofr Maggi,2004. But with these values, the model does not converge.


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