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10-24-2016 08:40 AM

Hi,

I'll performed a non linear analysis with beam model. I would obtain in advanced post a non linear stress distribution of stress (using equivalent stress plot).

How can I obtain it?

Best regards

Stefano

11 REPLIES

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10-24-2016 03:46 PM - edited 10-24-2016 03:50 PM

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10-24-2016 06:05 PM

equivalent plot stress I obtain a coherent result. But I'll evaluate the

non linear stress in cross section.

S.Milani

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10-25-2016 04:33 AM - edited 10-25-2016 04:36 AM

I don't beleive this is true, because I recently had a convergence issue involving nonlinear material on a beam element in v11.3.0. And nonlinear output for the beam element is still available.

To answer OP's question, I don't think FEMAP supports an advanced display of nonlinear beam stresses on a 3D view of the beam element. Strand7 does this well: http://www.strand7.com/webnotes/search/?q=nonlinear+beam&all=

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10-25-2016 05:14 AM

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10-25-2016 06:18 AM

Hah, welp, I was using elastic-perfectly-plastic.

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10-25-2016 06:45 AM

**Kava**

Please indicate your settings for the calculation of non-linear material beam elements.

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10-25-2016 08:52 AM

Ah, I had no problem with it, I was just chiming in to try to help. I defined a plastic cutoff of 355 MPa in the Nonlinear tab of my material, which was applied to both plates and beams.

I ended up taking more nonlinear steps and that cured the problem. The strain increment was too large.

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10-25-2016 09:03 AM

Which of these materials allows to obtain a non-linear material for the analysis of beams?

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10-25-2016 09:21 AM - edited 10-25-2016 09:27 AM

It was the middle one. I got nonlinear beam output, but the nonlinear beam plastic strain was always zero. I assumed it was because it did not yield. ~~However, ~~**3930..Nonlinear Beam EndB Pt4 Eqv Stress **was just at the yield point (355 MPa), indicating yielding.

My mistake. It was at 35.5 MPa. Although I did get a divergence error on a nonlinear beam at one point, I corrected the model in the meantime to have higher yield strength and finer timesteps and that solved the problem. So I'm not sure what the whole story was honestly, but it's solved.

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