#1 2012-06-26 16:56:58

toltec

Member

Registered: 2009-01-04

Posts: 94

PESANTEUR and STAT_NON_LINE

Hello,

I want to run a non-linear analysis (COQUE_3D, contact is necessary) of a structure under self weight. I'm using V10.6.  I was hoping to ramp up the gravity load using DEFI_FONCTION to allow the contacts to resolve properly, but I see that PESANTEUR cannot be used with AFFE_CHAR_MECA_F. I checked U4.44.01 and the forum, but I'm not clear on how to proceed. Can someone point me in the right direction? I have a feeling the solution is staring me in the face!

Thank you... any help would be appreciated.

Gary

Last edited by toltec (2012-06-26 17:18:10)

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Ubuntu 12.04
Intel(R) Core(TM)2 Quad CPU    Q9400  @ 2.66GHz

delmas

Administrator

From: EDF R&D

Registered: 2007-12-12

Posts: 837

Re: PESANTEUR and STAT_NON_LINE

Maybe with AFFE_CHAR_MECA_F / FORCE_INTERNE.

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Code_Aster release : unstable on (Ubuntu Precise Pangolin 12.04 64 bits) - GNU + Intel

Code_Aster. What else ?

jeanpierreaubry

Guru

From: nantes (france)

Registered: 2009-03-12

Posts: 3,930

Re: PESANTEUR and STAT_NON_LINE

hello

i do it without using AFFE_CHAR_MECA_F, like this

selfwght=AFFE_CHAR_MECA(
  MODELE=model,
  PESANTEUR=_F(
	GRAVITE=10000,DIRECTION=(0,0,-1),
	..................
  ),
);

selfw_m=DEFI_FONCTION(NOM_PARA='INST',VALE=(0,0, 1,1, 2,1.35,),PROL_DROITE='CONSTANT',);

listnl=DEFI_LIST_REEL(
  DEBUT=0.0,
  INTERVALLE=(
	_F(JUSQU_A=1.2,PAS=0.1,),
	_F(JUSQU_A=2,PAS=0.1,),
  ),
);

statnl=STAT_NON_LINE(
  MODELE=model,CHAM_MATER=material,CARA_ELEM=elemcar,
  EXCIT=(
	_F(CHARGE=ground,),
	_F(CHARGE=selfwght,TYPE_CHARGE='FIXE_CSTE',FONC_MULT=selfw_m,),
	........................
  ),
.......................
);

jean pierre aubry

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freely available here https://framabook.org/beginning-with-code_aster/

cacciatorino

Member

From: Porto Recanati, Italy

Registered: 2008-11-05

Posts: 752

Re: PESANTEUR and STAT_NON_LINE

hello

i do it without using AFFE_CHAR_MECA_F, like this

I do the same, and it works.

@ toltec:

Most likely you will need to stabilize the model by the use of soft springs. At least, this is my experience.

toltec

Member

Registered: 2009-01-04

Posts: 94

Re: PESANTEUR and STAT_NON_LINE

Thank you all for the suggestions! You saved me lots of time.

Cheers

Gary

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Ubuntu 12.04
Intel(R) Core(TM)2 Quad CPU    Q9400  @ 2.66GHz