ABAQUS

Hello everyone,

I'm currently doing an analysis on the convergence rate of an incremental model that I have implemented in ABAQUS using a UMAT. Here's the BIG lines of the problem:

1) In UMAT : Solution of a differential equation using explicit Runge-Kutta 4 (RK4), which has a 4th order convergence rate, yields the stress state "S". (In my problem, stresses are applied)

Hi,



i need some help in writing the surface mesh in abaqus. i have a wing model, meshed using hexahedral mesh. now what i want is to write the surface element detail on a file, containing the element number and its neighbouring four nodes. for example



12, 2 3 5 6



here 12 is the element number and 2,3,5 & 6 are the corresponding nodes.

Dear friends,



I used *map solution a lot and it works fine in my modelling. Recently, I
came across a problem with "predefined fields". The ABAQUS's
documentation explicitly states "temperature and field variables are
mapped from the old mesh to the new mesh". According to my experience,
temperature is fine and it can be correctly mapped. Unfortunately, the
predefined fields can not be mapped.



I am not sure this is a bug of ABAQUS (slight likeliness) or something

I want to model a concrete slab with a void inside the concrete. It is a thermal analyse where I apply a heat flux to the bottom surface. Within the void heat is transferred by radiation and convection. For simulating heat convection within the void, I use the surface film condition function in interaction module. I have to define the film coefficient and sink temperature. I decided to use the average temperature of the void surface for sink temperature. I don’t know how to define the average surface temperature. I think I have to use Abaqus Subroutine.

Hello,

I'm trying create a bridge between scales using Abaqus, UMAT subroutine.

On macro scale I call UMAT, which calls other abaqus inp. with this example code

call SYSTEM('abaqus cae script=C:\Temp\mixUMAT\simpleModel.py -- A 2 5.3')

And my "simpleModel" receives all arguments properly.

However, I need some values which are calculcated on "simpleModel", to UMAT continues the executation.

Anyone knows  how can I do it?

Thank you! 

Dear all,



I am currently perform a curve fitting for material coefficient determination.

In my hand, i have a set of stress strain data from the shear test.

I try to import the data as planar test data in ABAQUS.

However, when i try to evaluate the material to get two term moooney rivlin coefficient out, it shows the following message.

"Material evaluation cannot be carried out with planar test data alone unless Reduced Polynomial, Arruda-Boyce or Marlow potentials only are used."