Re: dependency diagram for druckprag

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 Technology 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?

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

>>>"

It will work well but you have to give it the data in the proper waY: Let's say that your property -group_materi_druckprag depends on the equivalent plastic strain -kap and that the data points are as follows:

-group_materi_druckprag   	      -kap
		 8.0						0.0
		10.0					0.05
		45.0					0.10
		100.0					0.20	
		130.0					0.25

Then, the way to specify the diagram is as follows:

dependency_item 1 -group_materi_plasti_druckprag 1 -kap 5    (The number 5 indicates the number of data pairs to read)
dependency_diagram 1 0.0 0.05  0.10  0.20 0.25  8.0 10.0 45.0 100.0 130.0 (note that ALL the values for kap are entered first
then the values for group_materi_druckprag are entered)

I hope this helps!

Best Regards,

Fernando Lorenzo




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