Soil and Rotavator Blade analysis

Hi Paramveer,

in order to model soil material, consider using LAW20 (Bi-material).

hi,

IS LAW20 available in Hyperworks 11,

moreover I can not find it in RADIOSS theory manual

Regards:

Hi Paramveer,

Yes it is.

You can also consider LAWs 10 and 21.

Please refer to theory manual for more information on above two material models.

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Thankyou for your support as always.

HI prakash,

I am unable to understand the input parameters for LAW10

like.... A0,   A1,   A2......A max     etc.

as in my perspective these inputs are experimental data....

though the Theroy manual is informative

still I am unable to understand

if possible kindly provide the tutorial for the same....

or provide a set of diffrent type of soil material data/library.

thankyou.

Hi Paramveer, 

Please check the image below:

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Hi Prakash,

1) can you let me know what type of Property definition to be used for soil model.

2) while defining the MLAW 10 or MLAW 21, i need to define Amax......inorder to simulate failure criterion

so what could be the possible value. 

3) as per your previous thumbnail... for loose soil Tau0=0

what if the tau 0 is not equal to zero.

4) sending you few calculation thumbnail and model file(sent through secure dropbox)

for reference attached is the some materials data 

thanks

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Hi Paramveer,

LAW 10 is compatible with solid elements only.

See the plot image below on how to get Amax value.

If Tau0 is not equal to zero then there is a cohesive strength exits (as per your document)

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Hi prakash,

what type of interface is to be defined in this case....

moreover do i need to define contact surface??????

thanks??

Hi Prakash,

Can you please let me know the reference for the below mentioned image which contains the information on how to find the A0, A1 and A2 parameters for LAW10. 

Hi Paramveer, 

 

 

 

 

Please check the image below:

 

 

 

 

 

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Hi Sai,

That was published online, I think. I am not sure which website, though.

Hi Prakash,

I am trying to model soil in RADIOSS and I have used the equations as given above to find the yield coefficients A0, A1 and A2. The results I am getting are different from the actual properties. Can you give more insight on how J2 coefficients are calculated. I am unsure of the equation you have given for J2 because the curve given below (J2 vs P curve) can never occur for equation given by J2 = 1/3*(alpha^2*P^2- 2alpha^2*t0*P/tan(alpha) + alpha^2*t0^2/tan^2(alpha), since the P^2 coefficient is positive. Also, Is J2' the same as J2 in that text?

Also, Can you kindly guide what property to use for modeling soil in RADIOSS. I am currently using P14_SOLID with Isolid=24 and ismstr = 10. Please let me know if there is any better property. Further, is it advisable to have coarse mesh or fine mesh for modeling soil?

Hi Sai,

Can you check with this following Alpha?

Also, can you plot for (J2)^1/2 Vs Pressure instead and check if that fits?

You can use Brick, tetra, thick shell elements which are compatible with LAW 10.

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