• Registered: 2016-10-26
  • Posts: 8

Topic: Boundary condition for a 4 point test

Hello,
I'm modelling a 4-point test. For me, It's important to model the full beam in order to compare between the cracks from the experiments and from the model.
The thing is, I don't know what boundary conditions should be applied.
Since I've to supports, I modelled one with constrains in x,y,z " to resemble a hinge support" and the other with constraints in y,z " to resemble a roller support". I put the constraints in the y direction in order to prevent in deflections in the out of plane.
From the model results, I see that the supports at the two reactions seems reasonable and the curves are coincide, but after a specific time the curves tend to diverge from each other and the results are completely un realistic.

What do you think about this modelling?
Thanks.

Quote Post 1

  • dpryl
  • CC software developer
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  • Registered: 2007-07-13
  • Posts: 1,107

Re: Boundary condition for a 4 point test

Dear karim.attia.1,
if you wish advice on modelling your boundary conditions, please send us sketches/photos explaining the real setup (see also Troubleshooting, 2.1.1).

Just guessing: We recommend setting the Conditional Break Criteria such that the analysis stops when the errors are large at the end of a step, see also Troubleshooting, 2.4.2.1 Recommended settings.

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Quote Post 2