9/9/2015 Convergence problems with ANSYS's SOLID 65 finite element - can anyone help? - ResearchGate

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ALL ANSWERS (11)

K V Arun · Government Engineering College, Haveri

Clearly state your problem, how you have made crack in your model, how

the crushing data is given ?

Oct 3, 2013

Tanya Chardakova · University of Architecture, Civil Engineering and

Geodesy

Trough CivilFEM new concrete material is added and Solid65 behavior is

activated. The result in ANSYS Material models - concrete is in the

attached file.

Oct 3, 2013

Rena C. Yu · University of Castilla-La Mancha

SOLID65 only predicts the initiation of the cracks, not the cohesive

behavir in concrete. That is to say, when the cracks initiates, the solid

elements loses its resistence. That's why you have convergence

problem. Try Contact/Target 173/170 if you know the crack path.

Oct 4, 2013

K V Arun · Government Engineering College, Haveri

Better to try with contact elements

Tanya Chardakova

University of Architecture, Civil Engineering and Geodesy

1 / 0

Convergence problems with ANSYS's SOLID 65 finite

element - can anyone help?

When I use the SOLID 65 concrete finite element, my models lose convergence

too early. If I remove cracking and crushing capability, there are no convergence

problems. Why does this happen and how can I avoid it (I need cracking and

crushing)?

TOPICS

Oct 3, 2013

Finite Element Analysis ANSYS Finite Element Modeling Finite Element Method

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9/9/2015 Convergence problems with ANSYS's SOLID 65 finite element - can anyone help? - ResearchGate

http://www.researchgate.net/post/Convergence_problems_with_ANSYSs_SOLID_65_finite_element-can_anyone_help 2/3

Oct 4, 2013

Tanya Chardakova · University of Architecture, Civil Engineering and

Geodesy

Thank you for the advice, but I am not solving fracture mechanics

problem, I solve global behavior problem and I need an exact prediction

of the deflections of the structure. I am just trying single beams and

columns for now. but I want to solve a whole building eventually.

I think I need to adjust some of the nonlinear analysis options. Some

suggestions?

Oct 4, 2013

Himayat Ullah · Loughborough University

Check what constitutive material model you are using? If for example, it is

elastic-fully-plastic, then there will be convergence issues. Such issues

can be resolved by applying load in small increments. Further, ramp

loading will result in easier convergence than suddenly applied Step

loads. Also check other nonlinear options and give attention to error

/warning messages at the end of solution termination. Also check the

boundary conditions of your model.

Oct 7, 2013

Gabriel De Oliveira Ribeiro Ribeiro · Federal University of Minas

Gerais

I ve sent some files with examples we have processed using element

Solid 65. Hope they can be useful.

Oct 7, 2013

Tanya Chardakova · University of Architecture, Civil Engineering and

Geodesy

Thank you, Himayat Ullah and Gabriel Ribeiro, you have been very

helpfull! I will check all these and I hope I will get better results.

The material model I use is parabolic, as per Eurocode 2, so I don't think

that is the problem. I will try to solve it with more substeps, so the load

increment get smaller.

The boundary conditions are ok I think, because I solved my model

without cracking and crushing, and there are no problems there.

Oct 8, 2013

Ernst Aschmann · IT Sligo

Hi Tanya, did you have any luck with your convergence issues? I am

having similar issues with my models too, but my convergence values are

increasing and decreasing with in a substep.

Nov 6, 2013

Mahmud M.S. Dwaikat · An-Najah National University

Try using non-zero value for Tensile Crack Factor ( say 0.5) and the

crushing stress should be negative in compared to the positive cracking

stress). Also, if you want to get the full response, even post-failure, try

using Arc-length method, for displacement controlled analysis.

Jan 9, 2014

Beam Files.zip

9/9/2015 Convergence problems with ANSYS's SOLID 65 finite element - can anyone help? - ResearchGate

http://www.researchgate.net/post/Convergence_problems_with_ANSYSs_SOLID_65_finite_element-can_anyone_help 3/3

Mahmood Tavallaee · Kingston University London

Hi Tanya,

did you manage to fix the convergence issues? I am having the same

problem when I try to model RC slabs.

Jan 27, 2014

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