Hello, everyone!
I am a graduate student in Hunan Univ, my research field is meshless method. Instead of using codes to calculate, I find EFG has been well developed in ls-dyna, and using software may be more convienient for me.
But I can only find some introductional information, so I want to find some useful material in iMechnica.com!
THX!
As you may know wave propagation in circular cylinders is dispersive. As shown by Pochhammer, there
could be several different modes propagating in an infinite cylinder with
different wave speeds. I'm modeling wave propagation in a finite 3D circular cylinder in
Hi all,
I wanted to simulate fatigue crack growth in ls-dyna, obtain dK, crack tip stress fields. But I wanted to start from a simple model. I can't find any examples online, tutorial...
Dear friends,
I am using LS-Dyna for my master's thesis. I am now using 'LS-Prepost 3.1' for my post processing. I am doing explicit time integration based contact modelling. Is Prepost is the best post processing tool for such modelling or is there any other better software. Of course Prepost is free, but i wanna know if there is any other free and more powerful post processor.
Lamboram
Hello everyone,
I am curretly working on predicting the failure in thin loaded plates. The plates are impacted by a hemispherical rigid cylinders at a low speed (4.53 m/s <--> Free fall from 1.05 meter) and are perforated experimentally at their center.
I tried to simulate failure with ls-dyna on a shell based model ( the sheet is very thin : 1 mm thickness Vs 130 x 130 mm ), but it seems that the failure strain measured on the tensile tests is underestimated ( the curves after the begining if necking are false).
Dear all,
I would like to run a tensile test under ls-dyna of a mild steel and
apply a 7000 N load to the dog bone specimen on a explicite scheme.
Unfortunately, I
have wild deformations ( and an error) on the nodes on edges where the
load is applied, so can you please tell me what are the importants
constants (like time termination, mass scale,...) and how to perform a
perfect run?
Have a good day,
Thank you
M.
I hope this is the correct forum to post this in ...
Hi,
I am solving an implicit non-linear problem in LS-DYNA. I was not able to achieve convergence. I changed the default displacement andenergy norm (which are 0.001 and 0.01 respectively) to 0.009 and 0.05respectively, the solution converged. My question is, is it advisable to changethe default norms to achieve convergence?
Hello!
The model I'm working on in LS-DYNA is a simple pyramid-shaped shell constrained along the bottom edges with all DOF taken. The material used is MAT_PIECEWISE_LINEAR_PLASTICITY. Above the model there's a LOAD_BLAST (Air burst) placed, which deforms the model after the explosion.
The issue is that the model seems to vibrate ininitely after the explosion, what can be seen on the attached images (first one shows the graph of "Rigid Body Displacement", second one shows close-up of the line within the yellow rectangle).
