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Help with a LS DYNA compression test model

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Hi

I amtrying to model a simple compression test om a foam cube with LS DYNA. I have tried a lot of different approaches but there is always something wrong in the model :(. I have managed to get on model up and running, but i am having problems with excessive penetrations! Do anyone have any idea how to fix this?

I have includef the .k file as a text file to this post.

LS DYNA ADDING A BEAM

How do i add a reinforcement beam to a door of a car at the front using the ls dyna contact card CONSTRAINED_RIGID_BODY ?

LS DYNA ADDING A BEAM

How do i add a reinforcement beam to a door of a car at the front using the ls dyna contact card CONSTRAINED_RIGID_BODY ?

Crash Test Bench

Hi I am working on the designing of a crash test bench to measure vehicle door intrusions ?

Could some one provide me basic ideas on the test bench set up and how to mout the door on the test rig and which degrees of freedom to lock ?.

Crash Test Bench

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Hi I am working on the designing of a crash test bench to measure vehicle door intrusions ?

Could some one provide me basic ideas on the test bench set up and how to mout the door on the test rig and which degrees of freedom to lock ?.

Viscoelastic model parameters in LS-Dyna

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I'm using elastic solid elements to model wave propagation in an
structure in LS-DYNA. I need to add the effect of dissipation in the
system by using viscoelastic material model (MAT_006). All I know from
my material is storage & loss modulus (E=E'+E"*i). I was wondering
how can I transform these parameters into G0, GI and BETA needed by
MAT_006 (G=Gi+(G0-Gi)*exp(-beta*t))?

How to model spring damper system in ls dyna 12.1

hi how r u im doing a project based on landing gear struts system . i want to replace hydralic landing gear system by spring damper system in ls dyna . plz guys i need urgent help i m short ov time plzzz help me out

SPH modelling with LS-Dyna

Dear all,

I'm using LS-Dyna and I would like to model the interaction between a viscous fluid  and metallic substrates.

If everything is working in 3D, it's not the same with the 2D...

Indeed I've used each contact algorithm (I think) in LS-Dyna and each time the contact between my 2D elements and the sph is not initiated.

Does anyone has an explanation to this curious problem ?

Maybe I'm not using the good contact setting.

Or contact between sph and 2D elements is not available in LS-Dyna.

Can you help me ? 

Number of elements in a vectorized subroutine into LS DYNA

Dear all,

I'm writting an usermat into a vectorized subroutine in LS DYNA. The implementation is a non-local model based on an avarage of the strains.

For the implementation I need to know the strains for all the elements at each iteration to compute the non-local strains of all the elements.

Venkat Bharath's picture

Distributed Coupling in Abaqus

Hi all,

I am trying to replicate an analysis done in Abaqus by using LS Dyna. I've an input(inp) file of the abaqus model on which the analysis has been performed.

nazmtech's picture

orientations of plies of composite plate in LS DYNA

hello im a M-Tech student..i need  help regaring LS DYNA.i want to model a composite plate with the orientations[0/45/-45/90] i want apply the orientations and how to view the orientations of the plies. and i want know how to predict delaminations when it is impacted by a rigid ball...in LS DYNA..plz help me out

LS DYNA User Defined Failure Criterion

Hi:

 I am simulating a projectile impact on a plate and using LS - DYNA for the same. 

I have to use Barlat's anistropic plasticity model with the Johnson Cook Failure Criterion.

Now, Although Barlat's Model is in built into LS DYNA, how do I implement JC Failure criterion ? Is there a feature of User defined failure criterion in DYNA ?

If not, Is implementing a UMAT consisting of Barlat's consitutive eqn and JC failure criterion the only other option ?

 

Thank You,

  

 

 

 

 

rahul1986's picture

HELP LS DYNA

i need a big help. . .im having problems . . .in my problem there is a stationary block at origin . . .  a prisim is falling from some height . . . the problem is its workin fine . ..EXCEPT. . the prism is going through the block . . . i REALLY need help

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