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ABAQUS

what is the reason for Large element deformation?

Submitted by Dincoz on

Hi my Friends,

I am doing abaqus run for a copper specimen under hydrostatic pressure. The magnetude of pressure is in order of several Giga Pascals. In my material definition, I have defined stress-strain flow up to strain of 0.4. But as you can see in attached photo, some elements show very large deformation (considerably larger than 0.4). Knowing that I have not defined stress strain behaviour for srain greater than 0.4, how this can be occure? Unfortunately, niether adaptive meshing nor element deletation were not eliminate this issue!!

 

Best Thanks

Subroutine DFLUX in ABAQUS

Submitted by Frank Richter on


Dear Mechanicians,


time and again the question of modeling moving heat sources pops up, often in the context of laser heating.

One can achieve this using the subroutine DFLUX in ABAQUS.

I decided to post some links here to avoid responding with a longer explanation to every individual seeking assistance.

Please note that I have never worked with any one of these codes and have no access to ABAQUS at present.

No warranty is given by me.

"ELEMENT DELETION" is available in Abaqus Explicit:

ABAQUS built-in SMA model

Submitted by Frank Richter on


Dear Mechanicians,


time and again the question of SMA (shape memory alloy) modeling pops up.

In ABAQUS, you can achieve this only by (V)UMAT coding or by using the little-known built-in SMA model.

In the past I have frequently responded to queries on SMA modeling and could refer to a customer help site of SIMULIA. That site is down, regrettably.

I decided to post the files here to avoid responding with a longer explanation to every individual seeking assistance and uploading the files as E-mail attachment every time.

Finding element number corresponding to Fastener in a set in Abaqus

Submitted by pradeeprk on

Hi,
I have a model in which I used fasteners to find bolt forces. I created fastener sets and requested output by changing Domain to "Fastener" and selecting the set that contains Fasteners.
The problem now is, I'm not sure which force corresponds to particular bolt.


Options>Common>show Labels for elements only shows element numbers of remaining model but not Fasteners.

Characteristic length in ductile damage model in ABAQUS

Submitted by dithoap on
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Hi All,

 

I want to model a dogbone specimen made from polycarbonate.

I model it using linear elastic plasticity coupled with ductile damage model.

For the damage, we are going to use the tabular form to described the damage evolution d with respect to equivalent plastic strain epsilon_p.

In abaqus, it is written that we need to input the d with respect of equivalent plastic displacement (u_p) instead of epsilon_p via equation u_p = epsilon_p \times L; where L is the characteristic length.

 

Z-mat files in ABAQUS

Submitted by mithil on
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Hello,

I am trying to figure out how to incorporate Z-mat files in ABAQUS to simulate complex constitutuve models of polymers. While I have worked with UMAT subroutines before Z-mat is something new. Can somebody explain why Z-mat is necessary and are there any differences between conventional UMAT/VUMAT and Z-mat files?

Thanks.

-Mithil