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  1. mhn10624

    what is plastic strain??!!! elasto-plastic modeling problem...

    Hi. In elasto-plastic modeling , we need data like this : yield stress(or strenght.any difference?) plastic strain temperature . . . what is plastic strain?at yield plastic deformation begins so at yield plastic strain is zero (Abaqus ask to set the first plastic strain to...
  2. mhn10624

    Total heat flux or temperature gradient of plate in welding

    no answer any solution ??
  3. mhn10624

    Total heat flux or temperature gradient of plate in welding

    Hi. Is it possible to find the total temperature gradient of plate after welding? i want to find entropy generation of plate versus time and then integrating on total time,finding total entropy of plate. entropy is (heat flux/temp.) but abaqus output is nodal or element temp. or heat flux. what...
  4. mhn10624

    experts help please

    is it possible to solve quasi-steady state problem with abaqus? if i solve the problem in steady-state manner( in "step" , mark "steady state" instead of "transient"), density and Cp are ignored and it soves it as a complete steady problem([k]{T}=0) how is it possible to solve this form ...
  5. mhn10624

    experts help please

    yes i checked that steady-state has no problem (effect of density and Cp is ignored and everything will be ok-heat is conducted through plate with no resistanse) thanks a lot again i will check this topic if you found something, i will be glad (so glad! :)) to know ...
  6. mhn10624

    experts help please

    i used data for steel 304l from an article. temperature variation at points 3mm , 8mm , ... , 23 mm was checked in that article for plat 200mm*200mm*3mm . i validated the method in this points by changing a,b,cr,cf of heat source (which are near weld line) but when i check temp at points more...
  7. mhn10624

    experts help please

    thanks a lot corus for your responses the dimension .12 m is correct ... did you checked the dflux code? was any problems there? if we make a,b,cr,cf so small,temp. on weldline goes up (700 or more). it is more than melting point.but just centerline senses this variation.temp. on weldline goes...
  8. mhn10624

    experts help please

    to mrgolthrope : thanks for your suggestion. I have 3D model and all dimensions in m . 0.5*0.5*.005 m plate to corus : i have read many papers (steel and aluminium).you are right.some of them report conciderable temperature drop from weld line.but we are engineers.we cant tell lie to...
  9. mhn10624

    experts help please

    question 1 : make the parameters a,b,cf,cr so small (concentrating the heat source)- the temperature of weld line raise to 2500c.but no change to the temperature of the points near the side or in the middle of semi-plate. why? question 2 : make the input power 10times greater (for example...
  10. mhn10624

    experts help please

    dear corus i did what you said (as you have done) and as you said there is no difference. i called one of my friends who worked weld modeling by Ansys. he said he had some problems like this in points near the sides (far from weld line). but not such an error ! it is really unacceptable for...
  11. mhn10624

    experts help please

    it is about 10 days that i am checking different possibilities ... i used finer mesh and submmit i deactivated radiation and submit i used less 'h' = about 2.5-9 and submmit but just temperature along weld line changes max temperature of nodes in transverse direction dont increase as much as it...
  12. mhn10624

    experts help please

    yes excatly this is the problem ! on the weld line and distanses about .05 m from it (transverse direction), temperature is sensed and it is ok . but as you see nodes further from this distance dont sense any temp change. as an example : from an experimental work , temp. of point...
  13. mhn10624

    experts help please

    i changed it to 1 no difference load is user defined - dflux - i am realy confused - when i change k from 222 to 2220 , or changing density from 2710 to 2.7 , heat transfers to the further elements and they sense the moving heat source but with real data of aluminium 1100 , no conduction to...
  14. mhn10624

    experts help please

    note : in dflux v=24 (voltag) is missed ... it should be added please
  15. mhn10624

    experts help please

    and this is .cae i will check what you said .... i will become thankful of you so much if you check these files best regards sirhttp://files.engineering.com/getfile.aspx?folder=75cd4bbc-8396-435a-969f-78f15f581000&file=model_1_-_temperature.cae
  16. mhn10624

    experts help please

    this is fortran codehttp://files.engineering.com/getfile.aspx?folder=87c3377c-6e13-4ffa-ac03-bc3df189aa7f&file=dflux1.for
  17. mhn10624

    experts help please

    i checked units many times aluminium 1100 : density = 2710 kg/m3 k= 220 w/m.c (varies with temp) h = 25 w/m2.c Cp= order 900 j/kg.c dimensions : .5 m * .5 m * .005 m Q= n VI w it is about 10 days that i am checking units and values !!! please help what is happening that i cant find it...
  18. mhn10624

    experts help please

    hi i am working on modeling tig arc welding of thin aluminum plate (simple but weld). i have done this : 1.writing fortran code -dflux- for moving double ellipsoid heat source 2.create part (a .5 m *.5 m square with thickness .005 m) 3. define material (temperature dependent k,density,Cp,...)...

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