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Explicit

New publication for UMAT and VUMAT in ABAQUS

Submitted by safaei on
UMAT
VUMAT
ABAQUS
flow rule
Explicit
Abaqus implicit

We performed a comprehensive study of a large class of Implicit and Explicit integration algorithms for Elastic-Plastic behaviors in Finite Element Analysis (FEA) developed in UMAT and VUMAT for ABAQUS and presented various unique results. We also showed detailed integration algorithms for both Associated and Non-Associated Flow Rules with mixed isotropic and kimenatic hardening with expandable number of internal variables (damage and etc).

Full bibliographic details:

User subroutine for Calculix explicit

Submitted by prammod on
Forums
Computational Mechanics Forum
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research
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calculix
Explicit
User Subroutine

Hello,

I want to use Calculix explicit for large deformation problem. I want to use a user subroutine similar to vuhard (in ABAQUS) to model the material behaviour. Calculix documentation metions uhardening, but there is nothing similiar to vuhard.

Is there a way to do this?

explicit analysis critical time-step Ansys

Submitted by tejas.ruparel on
Explicit
ansys
explicit dynamic
critical time-step

hello,

 I am trying to solve a simple cantilever beam (2D)  in ansys.

I wish to find out the critical time-step that can be used to explicitly solve a transient problem. 

 

I started with modal analysis to determine the maximum natural frequency of the model. I then computed dt < 2/Wmax.

I use this dt with beta = 0.0 and gamma = 0.25 (Newmark parameters). However the solution is unstable.

I am including my apdl script with this post.

Electric Potential B.C. in the Dynamic/Explicit Step

Submitted by mhdiab on
ABAQUS
Explicit
dynamic
Electric Potential
B.C.
Hey all,

I am trying to apply an Electric Potential B.C. to a surface. I want to use the dynamic/explicit analysis type, however, when I select that as my step type, the Electric Potential B.C. option disappears from the edit B.C. window! Is that due to a license limitation or an error I might have made in one of the definitions?

Thank you!

Newmark scheme beta and gamma parameters

Submitted by iLoic on
Explicit
Newmark
RADIOSS

Hi,
Concerning the Newmark method with central difference for an explicit resolution I want to know where the parameters beta and gamma come from ?

I have found this :

http://www.stanford.edu/group/frg/course_work/AA242B/CA-AA242B-Ch7.pdf
but how do these parameters appear ?

Using RADIOSS, the theory manual says the remainder of the taylor's series is computed using numerical integration but I don't know which rule is used.

Cylinder inflation using Abaqus

Submitted by manz_0 on
research
Explicit
membrane structure
elastic-hyperelastic

Hi All,

 I am trying to model the inflation of an enclosed elastic cylinder. The only example I have came close to in the Abaqus support documentation is the air bag inflation test. However, even reading the documentation, I am still unsure on how to model the airbag before an inflation force is applied. Can someone help me with this? You can also e-mail directly: manpreet.puri [at] strath.ac.uk.

Plywood box under pressure on ABAqus

Submitted by Manaliac on
ABAQUS
Explicit
Shell
pressure

 

Hello everyone,

 

I am working right now on a plywood box simply supported by wedges under a uniform pressure of 1 MPa.

The pressure is applicated through a rigid shell part layed on the top of the box ( a surface to surface contact). The bottom of the box is on contact (surface to surface) with the rigid shell wedges (2 on the corner of the box and 1 on the middle).  

As a boundary condition, all the DOF's of the wedges are constrained.    

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