Radioss Solid Prop 6
Altair EmployeeHello,
I am doing a flatwise compression simulation for a honeycomb core with solid modeling(LAW 28/Honeycomb). The solid property 6 says, it has fully compressible elements. Unfortunately in my simulation the elements do not compress fully and show unwanted stiffness at unexpected time/ displacement. Could you please help me out in this regard?
I am sharing the model file, output file and the curve plot. It is modelled with 7mm element size.
Looking forward to the reply.
With Regards
Abhinav
<?xml version="1.0" encoding="UTF-8"?>
Answers
-
Hi @Abhinav
I think this is because of the E33 curve. Is it possible to refine them a little bit and check if that helps?
0 -
Hi Prakash,
The E33 curve is from experimental testing. I can put more points in between the curve but the curve shape would not change. If that is what you mean with refining.
0 -
0 -
0
-
Thanks Prakash.
I would be looking forward to your reply.
With Regards
Abhinav
0 -
Hi,
Could you pelase check with the units that are used in the model? I may assume that these are g, mm, ms. Please confirm.
Also please check the stress-strain curves: the curve 8 used for direction 33 is 1000 times higher than the curves 12, 13 used for direction 1 and 2
In model definition: what are the direction of orthotropy, it is not specified in the property. I assume that this direction is aligned with global z-direction? Please confirm
0 -
Hello,
the units are g, mm, s.
the values of stress strain curves were derived through simulation of the model in these two directions (11 & 22). I am attaching the file alongwith.
how do you define the direction of orthotropy in property? i have defined through skew in new model. But it doesn't bring any changes.
<?xml version="1.0" encoding="UTF-8"?>
0 -
0
-
yes, 33 is from lab experiment testing.
SInce we dont have all the testing machines the E11 & E22, G12 had to be done through simulations.
0
