Mrt

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Posts posted by Mrt


ok=)
thank a lot.
interesting, but i have different result from abaqus. ) the rate is 2.

perfect!=)
it works!
my mistake was that i had used static nonlingeom.)
where did you find in UsGuide part about it feature?

I've just tried to open file.
Sorry, could you resave file on HM 2017, or just send .fem file?

Wow!
Thank a lot, Guys!:)
I'll read and look at your attached files!


Hello all!
i have one question!
is it possible in Optstrct to do these thing?
i want to use nonlinear analysis (preload by weight) for linear buckling analysis/
any idea?
thank a lot, Guys!

you can try to use radioss quasistatic. to my mind radioss is better for contact ussues;)

do you want connect "node to node"?
or "node to node set"?


15 hours ago, Ekaterina said:What is the physical difference between element densities as 0.8 instead of 1?
The penalization technique used is the “power law representation of elasticity properties,” which can be expressed for any solid 3D or 2D element as follows:
K(r) = K*ρ^p
where K and K represent the penalized and the real stiffness matrix of an element, respectively, ρ is the density and p the penalization factor which is always greater than 1.
In OptiStruct, the DISCRETE parameter corresponds to (p  1). DISCRETE can be defined on the DOPTPRM bulk data entry. P usually takes a value between 2.0 and 4.0. For example, compared to the nonpenalized formulation (which is equivalent to p=1) at ρ=0.3, p=2 reduces the stiffness of the element from 0.3 to 0.09 times the stiffness of the fully dense element. The default DISCRETE is 1.0 for shell dominant structures, and 2.0 for solids dominant structures (the dominance is defined by the proportion of number of elements) 
On 11/6/2018 at 1:35 AM, JFormiga14 said:The problem is when i run i have a displacement of 1e+10 and i don't understand why
use nonlinear solver.

28 minutes ago, nvn said:i used on hypermesh at 2DMesh min/max. mesh size , but i can define by AcuSolve a global mesh size, because i have one volume, or not ? Additionally i can define curvature parameters, but my question is, is 0,02 m suitable for this model?
i haven't done mesh fo cfd, i haven't ever worked in acusolve.
as for me the best way to try=) do cube, and do diffrent approach/mesh size.=)



1 minute ago, nvn said:which global mesh size (absolute) is suitable for this model ?
you can't use one size fo all model.
as i know you should use min/max and grow rate parameters.
and my question to @acuprowhy can't i use several volumes separated by wall?


what solver do you use?
in optistruct is possible to do tie contact automatic=)
tools>contact brouser>entities field mouse right button>autocontact>property type "freeze" for tie

37 minutes ago, Chethan Y C said:Current Memory (RAM) : 19617 MB
(Note: MUMPS Solver Allocates Memory Separately.)
Estimated Minimum Memory (RAM) for Minimum Core Solution: 51571 MBtry to solve reduced model/part of model.
it's difficult to search mistake in large model. 
have you tried to solve part of model? Has it gone?
maybe it's so large for your computer?

could you show .out file?

clear all previous files in work folder (close hyperview if it is opened).
check penetration.

it's interesting phenomena=)
looks like scale factor 6 on OY=)


2 hours ago, LOKESH KATARI said:do we have any control card for model reduction in Optistruct
=) i think so if @Prakash Pagadala say that it wasn't possible you can't do it.
using nonlinear subcase for linear buckling
in Altair OptiStruct
Posted · Report reply
at first i'll try to check units=)
i think the same, results should be similar.
linear buckling (without nnl step) results are the same.