Re: dependency diagram for druckprag

[email protected] Sat, 25 Feb 2012 16:05:24 +0800
Newsgroups gmane.comp.mathematics.tochnog.user
Organization HKUST
Message-ID <[email protected]>
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On Saturday, February 25, 2012 01:54 AM,=20
[email protected] wrote:

Hi Fernando,

Thanks for your reply. I know the use of dependency_diagram. But the=20
number of dependency_item for group_materi_plasti_druckprag is THREE:=20
phi, c and phiflow, while I only want to set c dependent on kap. In=20
tochnog pro, there is a dependency_number to set which item, but there=20
is no such option in tochnog free. So I write all three parameters for=20
each kap (I have 2 values for kap 0 and 0.1). There is no error message=20
for the input file. Just the result seems unreasonable.

Ning


> Message did not come well but I was able to read it and reply:
> "...
> Hi all, I'm testing the Drucker-Prager plasticity model. To enforce an =
isotropic softening behavior, I use dependency_item and dependency_diagra=
m. I want to change `c` value (in group_materi_plasti_druckprag) accordin=
g to `kap` so as to decrease the yield strength `K`. In tochnog pro, ther=
e is dependency_number option. But there is no such option in the free ve=
rsion. So I write like this: dependency_item 1 -group_materi_plasti_druck=
prag 1 -kap 2 dependency_diagram 1 0. 0.1 0.611 1.5e6 0.175 0.611 5246.89=
 0.175 Here `phi` and `phiflow` are kept unchanged and only `c` is decrea=
sing. But I find I cannot get a reasonable solution. I get a inhomogeneou=
s field which I expect not. Also if I delete this two lines (no hardening=
/softening behavior), the result seems correct. Could anyone tell me what=
 causes this problem? Or how to enforce the softening behavior for d-p mo=
del? -- Geotechnical Group Department of Civil and Environmental Engineer=
ing Hong Kong University of Science and Te!
>   chnology Clear Water Bay, Kowloon, Hong Kong --------------0009050001=
03040008020104 Content-Type: text/html; charset=3DISO-8859-1 Content-Tran=
sfer-Encoding: 7bit Hi all,
>
> I'm testing the Drucker-Prager plasticity model. To enforce an isotropi=
c softening behavior, I use dependency_item and dependency_diagram. I wan=
t to change `c` value (in group_materi_plasti_druckprag) according to `ka=
p` so as to decrease the yield strength `K`. In tochnog pro, there is dep=
endency_number option. But there is no such option in the free version. S=
o I write like this:
>
> dependency_item 1 -group_materi_plasti_druckprag 1 -kap 2
> dependency_diagram 1 0. 0.1 0.611 1.5e6 0.175 0.611 5246.89 0.175
>
> Here `phi` and `phiflow` are kept unchanged and only `c` is decreasing.=
 But I find I cannot get a reasonable solution. I get a inhomogeneous fie=
ld which I expect not. Also if I delete this two lines (no hardening/soft=
ening behavior), the result seems correct. Could anyone tell me what caus=
es this problem? Or how to enforce the softening behavior for d-p model?
>


--=20
Geotechnical Group
Department of Civil and Environmental Engineering
Hong Kong University of Science and Technology
Clear Water Bay, Kowloon, Hong Kong


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    On Saturday, February 25, 2012 01:54 AM,
    <a class="moz-txt-link-abbreviated" href="mailto:[email protected]">[email protected]</a> wrote:<br>
    <br>
    Hi Fernando,<br>
    <br>
    Thanks for your reply. I know the use of dependency_diagram. But the
    number of dependency_item for group_materi_plasti_druckprag is <font
      color="#990000">THREE</font>: phi, c and phiflow, while I only
    want to set c dependent on kap. In tochnog pro, there is a
    dependency_number to set which item, but there is no such option in
    tochnog free. So I write all three parameters for each kap (I have 2
    values for kap 0 and 0.1). There is no error message for the input
    file. Just the result seems unreasonable.<br>
    <br>
    Ning<br>
    <br>
    <br>
    <blockquote
      cite="mid:[email protected]"
      type="cite">
      <pre wrap="">Message did not come well but I was able to read it and reply:
"...
Hi all, I'm testing the Drucker-Prager plasticity model. To enforce an isotropic softening behavior, I use dependency_item and dependency_diagram. I want to change `c` value (in group_materi_plasti_druckprag) according to `kap` so as to decrease the yield strength `K`. In tochnog pro, there is dependency_number option. But there is no such option in the free version. So I write like this: dependency_item 1 -group_materi_plasti_druckprag 1 -kap 2 dependency_diagram 1 0. 0.1 0.611 1.5e6 0.175 0.611 5246.89 0.175 Here `phi` and `phiflow` are kept unchanged and only `c` is decreasing. But I find I cannot get a reasonable solution. I get a inhomogeneous field which I expect not. Also if I delete this two lines (no hardening/softening behavior), the result seems correct. Could anyone tell me wha
 t causes this problem? Or how to enforce the softening behavior for d-p model? -- Geotechnical Group Department of Civil and Environmental Engineering Hong Kong University of Science and Te!

 chnology Clear Water Bay, Kowloon, Hong Kong --------------000905000103040008020104 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi all,

I'm testing the Drucker-Prager plasticity model. To enforce an isotropic softening behavior, I use dependency_item and dependency_diagram. I want to change `c` value (in group_materi_plasti_druckprag) according to `kap` so as to decrease the yield strength `K`. In tochnog pro, there is dependency_number option. But there is no such option in the free version. So I write like this:

dependency_item 1 -group_materi_plasti_druckprag 1 -kap 2
dependency_diagram 1 0. 0.1 0.611 1.5e6 0.175 0.611 5246.89 0.175

Here `phi` and `phiflow` are kept unchanged and only `c` is decreasing. But I find I cannot get a reasonable solution. I get a inhomogeneous field which I expect not. Also if I delete this two lines (no hardening/softening behavior), the result seems correct. Could anyone tell me what causes this problem? Or how to enforce the softening behavior for d-p model?

</pre>
    </blockquote>
    <br>
    <br>
    <pre class="moz-signature" cols="72">-- 
Geotechnical Group
Department of Civil and Environmental Engineering
Hong Kong University of Science and Technology
Clear Water Bay, Kowloon, Hong Kong</pre>
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