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[FEM] How we are using shell geometry properties in time of calculation?

Submitted by IvanKushnarenko on
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Shell
Geometry
quadratic forms

Hello.

I'm interested in methods and approaches for FEM, that are used for taking into account the shell geometry properties (curvatures, quadratic forms) in time of calculation. I'm not telling about NURBS, the shells are defyned by analytical expressions: sphere, Monge surfaces, Joachimstahl surface. In Zienkewich book they are use the flat elements, but in time of calculation they don't use the shell geometry, only for mesh generation. Maybe someone somehow have used in shape functions the coefficients of quadratic forms...

FINITE ELEMENT WEAR SIMULATION

Submitted by phanikumar376 on
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ABAQUS
user subroutines

hi all,

        i am very new to abaqus and i want to simualte sliding wear between a pin and a disc. i found from the literature that by using user subroutines we can calculate the wear. i am not getting how to use a user subroutine , can any one expain how to use user subroutines in the CAE. is there any simple example problems in understanding this user subroutine functions. thanks in advance. 

apply a seismic load in abaqus

Submitted by mohamadzare on
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i want to model a single pile whith surrounding soil in abaqus. my problem is about:

1)step mudulus: how i must define step mudulus to obtain a time history and spectral(frequency) displacement response.

2)how i can apply elcentro spectrum in abaqus. i dont know nothing about this.

thanks

 

I need some guidance on writing USDFLD subroutine on Abaqus

Submitted by itay on
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User subroutines in ABAQUS

Hey everyone,

I'm very new on Abaqus, and what I'm trying to do is to assign to a model a changing E modulo as a linear function of Z coordinate ( E(Z)=-33936.651*Z+25e06 ).

I tried to gather some knowledge over the web on how to do so, and I found out that It can be done by writing a USDFLD subroutine, I managed to pick of some exapmles the following code:

   SUBROUTINE USDFLD(FIELD,STATEV,PNEWDT,DIRECT,T,CELENT,

  1 TIME,DTIME,CMNAME,ORNAME,NFIELD,NSTATV,NOEL,NPT,LAYER,

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