ABAQUS

Dear iMechanica Community,

I'd like to ask for advice on modelling reflection and transmission coefficients when two bars with different cross-sectional areas contact each other and are exposed to pulse loading.

I have modelled this process in Abaqus/Explicit as a two-dimensional simulation. The investigation was conveniently done as a parametric study, defining the lateral dimension as parameter. Both bars are slim (length 2 m, diameter 2 cm) and elastic.

Dear Abaqus users,

I intend to plot the true distance of a path over all the steps of my simulation. 

One way is to create xy-data of an arbitrary output field over the true distance of the path, for each step.  Do you have any suggestion how I can get (true distance vs time) straightforwardly and faster?  

Thank you for your time and consideration 

Best regards,

jferreira

Hi all,

I'm using ABAQUS and UMAT for structural simulation. I used quadratic element (CPS4) with 4 integration points (IP).

During the calculation (which calling my UMAT), at each time step, for each element, I need to calculate the average stress of these IPs and produce a state variable for these IPs from this average stress. Then, I would need to update this state variable back to these IPs in that element. But as far as I know, the ABAQUS call UMAT for every IP and calculate everything within this current IP.

A new piece of software has been presented that connects the well-known FE code Abaqus with Matlab. The source code, detailed documentation and a large number of tutorials can be freely downloaded from www.abaqus2matlab.com 

Some interesting applications are addressed in the associated journal article:

Dear Mechanics community,

My current research work is focused on simulation of NiTi stents.

I need to benchmark my UMAT subroutine against inbuilt VUMAT subroutine for SMA in Abaqus.

It would be great to have suggestions on how can I go ahead on this task (like typical benchmark analysis, simulation of CAD models etc.,).

The basic idea is to analyse the limits of both the subroutines.

Warm Regards,

CompMech enthusiast...

Hello everyone, 

I found that there is no comprehensive topic about how to calculate material jacobian matrix for UMAT while it's one of the most complicated and important parts of writing a subroutine and a lot of the researchers deal with it. 

I think it would be great if experts share their sources and experiences here for all. I personally, try to provide the basics and essential materials as well. 

Here is an essential available PDF on Imechanica: