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From: HVTBT.T<ong@zu...>  20020214 14:05:00

Sorry, i have made a mistake.. How do u create trapezium? thank you. ping2 
From: UE59264Osman F Buyukisik <absd00t@c1...>  20020214 13:39:05

Ping2, Just create your trapezoid with 4 corners as one quad element. Then use control_mesh_refine_globally command to do h_refinement a few times (to get the mesh density you want). There are examples in the test directory of doing similar meshes. Osman 
From: HVTBT.T<ong@zu...>  20020214 09:51:16

Hi! I am just learning to use tochnog. and is wondering if it is possible to generate a trapezoidal mesh without using Gid? Can I use control_mesh_adjust_geometry to convert a rectangular mesh to a trapezoidal one? If so, do I have to specify all the 4 sides that I am adjusting or just merely one side only? Thank you. Ping2 
From: <utc@in...>  20020213 09:43:18

Hi all, I have been doing some more tests on the Todd's cantilever beam. = Here's an abstract of what I have done and what I have been supossing = all over the process:  First, as it was a simmetric problem, I turned it into a = 2D one (I suposse no problem with that) Plane strain, by default, as = always in tochnog, but this affects just to sigzz an its corresponding = strain.  Just as a improve, I turned node 95 into a geometry_point, = to make refinements easier.  As a comment, the units are not relevant if you are = consistent. I have made my checks assuming I work on th IS of units. = Just pay attention to the gravity  Then, as I was obtaining results for the defection of the = beam as Todd was doing (very very small) I went on the dbs file, and = looked at the stresses... They were too small too!! So I think there may = be a problem in the way I define a force  I decided to apply self weigth then (g=3D9.81 m/s2), and = apply M=3DpL2/2 and v=3D5/384pL4/EI. I would be not surprised with a = desviation of + 1015% over the expected results, but the resuts in = tochnog are about 1/100 the expected ones. Now I have no doubt about the = impossed force (just self weight). I have tried different iteration = numbers (up to 100) and several timesteps, and nothing improves my = solution. Please, any idea? I attach here my file in 2D in the case you want to do some more = tests. Thank you very much in advance, Jes=FAs Torrecilla Pinero Universidad de Extremadura. Spain (By the way, I see the post in the sourceforge page, not via email, = and I suspect I am losing some of them, because I can't see the Osman = one about the cantilever) = =  ( Tochnog input file 3D Cantilevered beam, T.Doehring=20 Adapted to 2D by Jes=FAs Torrecilla) echo yes number_of_space_dimensions 2 (derivatives) materi_velocity (materi_velocity_integrated) materi_stress end_initia (options_convection no) (options_inertia no) (options_processors 2) options_mesh fixed_in_space fixed_in_space (left side) geometry_line 2 0. 0. 0. .1 0.001 (right side) geometry_line 3 6. 0. 6. .1 0.001 (middle points) geometry_point 1 0. 0.05 0.001 (left side) geometry_point 2 6. 0.05 0.001 (right side) (left side fixed. velx in all points. vely just in the middle  avoids = stress concentration) bounda_unknown 1 geometry_line 2 velx=20 bounda_time 1 0.0 0.0 100.00 0.0 bounda_unknown 2 geometry_point 1 vely bounda_time 2 0.0 0.0 100.00 0.0 (right hand side: concentrated force =3D 1 lb in zdirection at end of beam, which is geometry_point 2) (bounda_force 3 geometry_point 2 vely bounda_time 3 0. 1. 100.00 1.0) force_gravity 0. 10.0 (i tried this but it didn't work...) (force_element_edge_geometry 10 geometry_quadrilateral 3 force_element_edge 10 0 0 1) (***********************) ( material props ) group_type 0 materi (group_materi_memory 0 updated_without_rotation) (**note the following modulus is in psi  It's the same. No units are = used all over the problem. You have just to be coherent) group_materi_elasti_young 0 10e6 group_materi_elasti_poisson 0 0.3 group_materi_density 0 10.0 (Now, as a load, self weight is .0 N/m) (create the beam) control_mesh_macro 0 rectangle 0 11 3=20 control_mesh_macro_parameters 0 3 .05 6 .1 control_mesh_macro_element 0 quad4 control_timestep 10 1 1 control_timestep_iterations 10 100 (control_options_solver 10 matrix_superlu_mt) (i assume you have GiD) control_print_gid 10 yes end_data 
From: todd doehring <tcdoe@bm...>  20020212 16:29:55

Dear Tochhies, thank you to Jan and Osman for their suggestion. Good news, and bad news. > Jan wrote: > is it right that you use only 2 elements over the thickness? > This is too few, you should use at least 4 elements (with linear The bad news is that i tried that (up to 5 element thickness) and it didn't work. the solution was still way off. you can try it yourself. all you have to do is change the number of nodes in the control mesh brick. It did soften the beam somewhat, but not close to analytical solution. I also tried prefinement... still not close. Good news. If i use very small time increments, it works nicely! even with only two element thickness. The solution is not too bad even for only ONE element thickness. Once again, since I posted the input file, you can try it yourself if you want... you need about 50 iterations (.01 .5) to get accurate solution. This demonstrates the apparent "tradeoff" in tochnog between number of elements, and number of iterations. It appears that, to obtain an accurate solution, one must use a certain minimum number of iterations (that could be determined via a convergence test). Once again, thanks to those that replied. Todd CCF/NASA 
From: Jan.J<ansen@gm...>  20020212 07:39:39

Hi Todd, is it right that you use only 2 elements over the thickness? This is too few, you should use at least 4 elements (with linear shapefunctions) or elements with a higher order shape function. The solution should converge to the analytical result with an increaing number of elements over the beam´s thickness. Greetings Jan  GMX  Die Kommunikationsplattform im Internet. http://www.gmx.net 
From: todd doehring <tcdoe@bm...>  20020212 02:15:09

Hi Tochnoggers, I have been working with tochnog for a little while now, and like it, but am having a serious problem validating a simple cantilevered beam. tochnog seems to drastically underestimate the known solution for endofbeam deflection. it is easy to solve analytically for beam deflection using the standard equation for rectangular beam... zmax = (load)(length)^3 / 3 EI where E = 10e6 psi (yes, 10e6, which is also 1e7) I = 1/12 base*height^3 = 1/12 (.2)(.1)^3 = 1.66667e5 load = 1 lb length = 6 in then zmax = 216/500.001 = .432 inches no doubt about it. the analytical solution should be about 0.43 inches deflection for 1 lb load (at end of beam). i am absolutely sure about this. with tochnog i am getting beam deflection of about 0.01 inches. here is my input file. i have agonized over this with no success, and i hope someone can help me out. i am hoping that it has something to do with the way i am specifying load... or the modulus, that is not correct for tochnog. perhaps some lack of understanding of the units on my part. one thing i noticed is that if i use "32 lbs" for the force, i get nearly the exact answer (not quite though). so perhaps it is no coincidence that the accelleration of gravity is 32 feet/second? thanks in advance. todd doehring cleveland clinic and NASA ( Tochnog input file 3D Cantilevered beam, T.Doehring ) echo no number_of_space_dimensions 3 derivatives materi_velocity materi_velocity_integrated materi_stress end_initia options_convection no options_inertia no options_processors 2 (options_mesh fixed_in_space fixed_in_space fixed_in_space) (left side) geometry_quadrilateral 2 0. 0. .1 0. 0. 0. 0. .2 .1 0. .2 0. 0.001 (right side) geometry_quadrilateral 3 6. 0. .1 6. 0. 0. 6. .2 .1 6. .2 0. 0.001 (left side fixed) bounda_unknown 1 geometry_quadrilateral 2 velx vely velz bounda_time 1 0.0 0.0 100.00 0.0 (right hand side: concentrated force = 1 lb in zdirection at end of beam, which is node 95) bounda_force 2 95 velz bounda_time 2 0 1 1 1 (i tried this but it didn't work...) (force_element_edge_geometry 10 geometry_quadrilateral 3 force_element_edge 10 0 0 1) (***********************) ( material props ) group_type 0 materi group_materi_memory 0 updated (**note the following modulus is in psi) group_materi_elasti_young 0 10e6 group_materi_elasti_poisson 0 0.3 (create the beam) control_mesh_macro 0 brick 0 11 3 3 control_mesh_macro_parameters 0 3 .1 .05 6 .2 .1 control_mesh_macro_element 0 hex8 control_timestep 10 1 1 control_timestep_iterations 10 5 (control_options_solver 10 matrix_superlu_mt) (i assume you have GiD) control_print_gid 10 yes end_data 
From: <pachevalier@ne...>  20020205 20:32:34

Hello Jos, I had the same problem as you. Tochnog is too difficult for complex geometry. I have study many *.bas Gid files and many *.dat tochnog files t= o understand these softwares. Finally, i write a problem type with name tn= =5Fmeca.bas and some script with gawk ( automatic invoke ) to apply condit= ions. I don't have any documentation, but that's easy to use if you have l= earned Gid and tochnog. Capabilities are: on points, block, displacement, forces (vector global and local), temperat= ure. on points, contact with plane (quadrilateral), cylinder, sph=E8re, polynom= ial surfaces. on lines, block , displacement in global axes, forces (vector global and l= ocal) transfert directly at the mesh or distribute on the line, temperatur= e. on surfaces, block , displacement in global axes, forces (vector global an= d local) transfert directly at the mesh or distribute on the line, tempera= ture. on volume, temperature. material, all tochnog group types. interval, all tochnog control. I tested these script with Gid 6.1.5.b (that doesn't work with 6.1.5c and = 6.2.0b, this is not a problem of my script) and it's work good if setup of= mesh is reasonable. The problem is how can i diffuse these scripts, with what license ? GNU ? ( my script need some old tochog tcl script and gawk for windows ). Patrick Chevalier.  Original Message  From: =22Jos Mauritius Runarka=22 <josrdbbb=40cetus.zrz.TUBerlin.DE> To: <tochnogusers=40lists.sourceforge.net> Sent: Sunday, January 06, 2002 7:41 AM Subject: =5BTochnogusers=5D HowTO GID>Tochnog Input? > Hi, > can somebody give me a hint how to define boundary conditions for a complex > geometry in GID and let GID write the definitions for the tochnog input file. > Which GID version should I use? > > I thank all of you in advance. > > > best regards, > > > > jos runarko > .. > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F > Tochnogusers mailing list > Tochnogusers=40lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/tochnogusers >  NetCourrier, votre bureau virtuel sur Internet : Mail, Agenda, Clubs, Tool= bar... Web/Wap : http://www.netcourrier.com T=E9l=E9phone/Fax : 08 92 69 00 21 (0,34 E TTC/min  2,21 F TTC/min) Minitel: 3615 NETCOURRIER (0,15 E TTC/min  1,00 F TTC/min) 