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03-11-2014 02:11 PM

Is it possible to solve in Femap NX Nastran problem of loading concrete structure with opening cracks? If possible, you can get a simple example of such a decision.

11 REPLIES

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03-18-2014 03:04 PM

In addition to the previous question here, such a calculation is made with NX Nastran?

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03-20-2014 05:00 AM - edited 03-20-2014 05:02 AM

Hello!,

The basic nonlinear static module of NX Nastran (SOL106) supports the following types of yield criteria:

von Mises (ductile materials)

Tresca (brittle and some ductile materials)

Drucker-Prager (sand and

**concrete**)Mohr-Coulomb (rock material)

Regarding the "element rupture" feature, you have it under Advanced NonLinear Solver (SOL601/701), take a look to the following post:

Also, here you are an animation of this feature:

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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03-20-2014 11:12 AM

**Blas_Molero, **thank you for your response.

As I understand it, you solved the problem SOL701, but to search for a solution takes a very long time. Decision SOL601 also have the opportunity accounting "Allow Element Rupture",

but in excess of the maximum level of strain no gap grid.

In help have such an item:

"Allow Element Rupture - Checking this option indicates the table in the TABLES1 entry (created using Model, Function in FEMAP) will NOT be extended by linear extrapolation of the two last points, which may be used to allow element rupture at the last specified strain value. Creates XTCURVE field on NXSTRAT entry. When unchecked, the table is extended (Default=1,

unchecked) "

how to carry it out?

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03-23-2014 07:07 AM - edited 03-23-2014 07:12 AM

Hello!,

You can use SOL601 of course, it depends of the complexity of the problem, SOL601 allows to run both nonlinear advanced static SOL601,101 and advanced dynamics SOL601,129, when SOL701 is only explicit dynamics analysis.

Regarding the problem with strain, without the model in hand not easy answer, check with SIEMENS GTAC at http://www.siemens.com/gtac and send them the model for inspection, they will take care of the problem and will tell you what is wrong.

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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08-11-2015 06:10 AM

Good day,

I would like to find out how to setup contact between solid tet elements (representing concrete) and beam elements (representing rebar) in FEMAP.

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08-11-2015 06:18 AM

Hello!,

**Contact "no penetration" (ie, sliding) between line slements & surface or solid elements is not allowed (supported) by current NX NASTRAN solver V10.1**. You need to mesh the rope (or rebar) with solid elements to define a surface-to-surface contact "no penetration". Then the computational cost you can imagine will be enormous, not possible with current hardware resources.

In real life the less complex problem is the contact, but rupture of the concrete material upon reaching a stress level. This is a nonlinear problem, where you need to have a rupture nonlineal material model for the concrete.

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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08-11-2015 06:37 AM

Good day Blas,

thank you so much for your prompt response.

"**Contact "no penetration" (ie, sliding) between line slements & surface or solid elements is not allowed (supported) by current NX NASTRAN solver V10.1**."

Is the "**Glue Contact**" between line elements & surface or solid elements possible? If so, how to setup in FEMAP?

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08-11-2015 07:37 AM

Hello!,

**EDGE-TO-FACE GLUE** is available between edges of shells and faces of solids or Shell elements, but not at all between line elements and surface or solid elements (also edge-to-edge between edges of shell elements).

The best method is simply **MERGE** nodes between CBEAM elements and solid CHEXA/CTETRA elements, this way you fully transmit displacements with success!!.

Take a look to this video in YOUTUBE:

https://www.youtube.com/watch?v=kvbD6VAyg3c

Best regards,

Blas.

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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08-12-2015 04:23 AM

Good day,

I have modelled the concrete & curves/lines representing reinforcement in Solid Edge.

I converted the model to Step File Format and exported to FEMAP.

In FEMAP, the solid & curves/lines are visble except the original curves that I used to pattern the other curves. This makes my model incomplete, what setting shall I activate in order to see all the curves representing my rebar in FEMAP? I checked everything under options both in Solid Edge and FEMAP.

Im planning to create two groups consisting of a solid and the rebar lines then mesh the curves seperately all at ones with beam elements, is this possible?

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