Explicit

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:

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.

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!

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.

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@strath.ac.uk.

Any help would be much appreciated and thanks all for your time to look at this post :) 

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.    

Hi...

Hi everyone!

I need advice, I have to carry out a bridge-truck interaction analysis in ABAQUS FOR CATIA. I don´t know where I can start, the thing is that now I´m going to try doing it, in a simplified model in order to don´t loose time.

Can you help me? Can you give me some advices? how to model de truck? I need more or less precission on the bridge not in the truck. I know how to modelice the bridge, the type of element, the meshing, the connectors... but what I don´t know is how to manage Explicit,

Dear Sir,

             1.  In FEM, I have not understood the exact difference between Implicit and Explicit techniques, though I have used both type of solvers.... Can u pls help me out in this?