How to model sand by ABAQUS/CAE?

[Chee Heong Tee]

Hi All,

Does anyone know how to model sand by ABAQUS/CAE?
Thanks a lot in advance.

-Chee Heong


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[Fernand A. Thomassy]

Post by Chee Heong Tee
Does anyone know how to model sand by ABAQUS/CAE?
Thanks a lot in advance.
-Chee Heong

Step 1: Hire an engineer.

===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================



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[See-Chew Soon]

1) Chee Heong, you need to know what is physical and what is
mathematical. In FEM everything is mathematical, we solve equations!
Soil can be model using elasticity, plasticity or viscoelasticity.
Depands on what analysis you want to do.

2) Mr. Thomassy, I think your reply is not helpful.

Good day.

SC


----- Original Message -----
From: Fernand A. Thomassy <***@swri.org>
Date: Fri, 16 Jul 2004 13:01:50 -0500
Subject: RE: [ABAQUS] How to model sand by ABAQUS/CAE?

Post by Chee Heong Tee
Does anyone know how to model sand by ABAQUS/CAE?
Thanks a lot in advance.
-Chee Heong

Step 1: Hire an engineer.

===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================

[Fernand A. Thomassy]

Post by See-Chew Soon
2) Mr. Thomassy, I think your reply is not helpful.

What made you think I was trying to help? This person posted one of the
worst questions you can imagine. He/she asked to have their thinking done
for them and did not even have the courtesy to define the problem. A
'stand' can mean many diverse applications and may have nothing to do with
soil.

Sure, we use ABAQUS to solve indeterminate equations but not to solve
undefined problems. If I were to ask "how do you solve an engine" you would
be correct in flaming me until I fled the list in shame. I don't really
mind "how to" questions but for goodness sake, be specific and show a little
effort in having researched the subject.

Goodbye . . . Fern
===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================



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[benjamin_hagege]

LOL !!! Agree with you Fern, heyhey ;)

BenZ.

Post by Fernand A. Thomassy

Post by See-Chew Soon
2) Mr. Thomassy, I think your reply is not helpful.

What made you think I was trying to help? This person posted one of the
worst questions you can imagine. He/she asked to have their

thinking done

Post by Fernand A. Thomassy
for them and did not even have the courtesy to define the problem.

A

Post by Fernand A. Thomassy
'stand' can mean many diverse applications and may have nothing to do with
soil.
Sure, we use ABAQUS to solve indeterminate equations but not to solve
undefined problems. If I were to ask "how do you solve an engine" you would
be correct in flaming me until I fled the list in shame. I don't really
mind "how to" questions but for goodness sake, be specific and show a little
effort in having researched the subject.
Goodbye . . . Fern
===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================

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[spacedude1423]

If you had read the original post, you would have seen this:

------------
Hi all,

I need helps with ABAQUS CAE. My model is 2-D axisymmetric. I would
like to set
the sand properties with only compressive stiffness, and no tensile
stiffness.
Is there any ways that I can set that up with ABAQUS CAE? I have been
trying
many ways, but it's not working. I would really appreciate it if
someone can
help me out.


Thanks a lot.


-Chee Heong
------------

However nobody replied to this, i know because i was tracking the
thread. The post you read which contained little information was
posted as a follow up because he received no answers.

So if you spent your time posting usefull replies, perhaps this
second post would never have been posted in the first place.

Post by Fernand A. Thomassy

Post by See-Chew Soon
2) Mr. Thomassy, I think your reply is not helpful.

What made you think I was trying to help? This person posted one of the
worst questions you can imagine. He/she asked to have their

thinking done

Post by Fernand A. Thomassy
for them and did not even have the courtesy to define the problem.

A

Post by Fernand A. Thomassy
'stand' can mean many diverse applications and may have nothing to do with
soil.
Sure, we use ABAQUS to solve indeterminate equations but not to solve
undefined problems. If I were to ask "how do you solve an engine" you would
be correct in flaming me until I fled the list in shame. I don't really
mind "how to" questions but for goodness sake, be specific and show a little
effort in having researched the subject.
Goodbye . . . Fern
===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================

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[Fernand A. Thomassy]

Anonymous spacedude1423,

I went back through the archives and the _original_ post of 16 July said
only "Does anyone know how to model sand by ABAQUS/CAE? Thanks a lot in
advance." You are referring to his post of 8 July which was a separate
thread with the title "Sand Properties." There is no reason to remember an
old post.

Chee got one answer to that post. Chee should have posted MORE information,
including a description of his failure with the original suggestion. His
complete lack of that kind of information is why I got whiny and sarcastic.

Regards . . . Fern
===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================



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[spacedude1423]

Post by Fernand A. Thomassy
Chee got one answer to that post. Chee should have posted MORE information,
including a description of his failure with the original suggestion.

That reply came AFTER starting the second thread, also after you
replied with sarcastic comments.

Listen, I understand why you have that attitude. But i also
understand Chee's attitude, if you post a question and get no
replies, you don't feel like explaining the problem again. I was just
pointing out that this wasn't the first thread on the sand topic. No
offence intended.




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[Fernand A. Thomassy]

Post by spacedude1423
That reply came AFTER starting the second thread, also after you
replied with sarcastic comments.

Good point.

Post by spacedude1423
But i also understand Chee's attitude, if you post a
question and get no replies, you don't feel like
explaining the problem again.

That makes no sense to me. If you get no reply then you must assume that
your question was not clear and/or lacked sufficient detail to get an answer
OR that no one had an answer. I thought his first post was clear. My
recommendation would have been to re-post the same information with an added
plea indicating a second try.

I'll stop whining now . . . Fern
===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================



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[Maziar Mahzari]

1-Open the abaqus documentation, search for the "sand" and you'll find a couple of matches. In the benchmarks manual there is an example for estimation of the limit load of a surface foundation on sand. You can use CAE/Viewer to see the results.

2- I recommend following readings for you:

-abaqus theory manual

-soil plasticity by W.F. Chen

-Finite element analysis in geotechnical engineering by D.M. Potts and L. Zdravkovic

You'd better use abaqus with full understanding of its theoritical basis.

3-To me it seems that you are gonna simulate a triaxial test (am I right?). There is an example in the verification manual for the triaxial test simulation.

4-I wouldn't post a message to the list before searching the abaqus manuals!

M. Mahzari

FDAC Marine/Coastal Consulting Engineers




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[Amir Tabakovic]

If you check ABAQUS help, example problems manual there is an example on soil analysis check it out, that should give you an idea.
Amir

Post by Chee Heong Tee
Does anyone know how to model sand by ABAQUS/CAE?
Thanks a lot in advance.
-Chee Heong

Step 1: Hire an engineer.

===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================

[v***@netscape.net]

I think the guys are being a bit rude. Either way...

ABAQUS has a big material library, which is able to model numerous materials. Now, it depends on the behaviour of your sand and the parameters that u have which model will choose. Most common case is that u have basic properties - internal friction angle and cohesion. Than u should be able to model sth like linear Drucker Prager plasticity, and that should work just fine. Porous elasticity might also be a solution. Try, I am not sure what exactly is the best way.

Post by See-Chew Soon
2) Mr. Thomassy, I think your reply is not helpful.

What made you think I was trying to help?  This person posted one of the
worst questions you can imagine.  He/she asked to have their thinking done
for them and did not even have the courtesy to define the problem.  A
'stand' can mean many diverse applications and may have nothing to do with
soil.
Sure, we use ABAQUS to solve indeterminate equations but not to solve
undefined problems.  If I were to ask "how do you solve an engine" you would
be correct in flaming me until I fled the list in shame.  I don't really
mind "how to" questions but for goodness sake, be specific and show a little
effort in having researched the subject.
Goodbye . . . Fern
===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================

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[Chee Heong Tee]

Thanks, guys. I apologize for the 2nd email I posted. For Mahzari, I did read the ABAQUS manual before I asked for help. But I only have ABAQUS/STANDARD and ABAQUS/CAE manuals, and the online documention I have is 2002 version. The 2002 version benchmarks manual doesn't have what I want.

There is no way I could choose no tension in elastic with ABAQUS CAE. The only way I could choose no tension is in porous elastic, and I tried it. But it showed error. It said, "Porous elasticity is specified, but the initial void ratio has not been define. Use *initial conditions to precribe the value." And I tried the initial condition, I couldn't figure it out.

I checked the porous elasticity from the website of www.hks.com. There is one example in the Benchmarks Manual, but it's 2004 version.

For Fern and Ben, I am sorry about that. I will be more specific next time.

Again, thanks a lot.

-Chee Heong



***@netscape.net wrote:
I think the guys are being a bit rude. Either way...

ABAQUS has a big material library, which is able to model numerous materials. Now, it depends on the behaviour of your sand and the parameters that u have which model will choose. Most common case is that u have basic properties - internal friction angle and cohesion. Than u should be able to model sth like linear Drucker Prager plasticity, and that should work just fine. Porous elasticity might also be a solution. Try, I am not sure what exactly is the best way.

Post by See-Chew Soon
2) Mr. Thomassy, I think your reply is not helpful.

What made you think I was trying to help?  This person posted one of the
worst questions you can imagine.  He/she asked to have their thinking done
for them and did not even have the courtesy to define the problem.  A
'stand' can mean many diverse applications and may have nothing to do with
soil.
Sure, we use ABAQUS to solve indeterminate equations but not to solve
undefined problems.  If I were to ask "how do you solve an engine" you would
be correct in flaming me until I fled the list in shame.  I don't really
mind "how to" questions but for goodness sake, be specific and show a little
effort in having researched the subject.
Goodbye . . . Fern
===============================
Fernand A. Thomassy, P.E.
Principal Engineer
Engine Design Section
Southwest Research Institute
===============================

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