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Abhinav

Radioss Solid Prop 6

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Hello,

 

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

7mm.hm

7mm_0001.out

Solid_model_error_compression.jpg

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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.

 

 

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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

 

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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.

 

image.thumb.png.14dd4b881935f84e7a8bf64e82b81f6b.png

 

 

 

L_long_node.hm

 

w_single_outer_node.hm

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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.

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