About use of command "strain"

[xuehanbing]

Dear all,
    I can get stress  nephogram by feap,but when I check strain of user-defined material modle by command "stain",the feap abruptly terminate its work.Who can explain this situation.
   Best wishes.

[Yaakov]

Hi,

could you check "elseif(isw.eq.4)" loops or the value of "istv"?

Regards, Yaakov

[Prof. R.L. Taylor]

It is not clear what our problem is.  If you give the command

STREss  in feap during a solution then you receive the output from information in the isw.eq.4 part of your element module.  If you also want strains you output them at the same time. You test this with a standard FEAP  solid element.

There is no STRAin command in feap

If you use the command PLOT STREss get stress contour plots in the qraphics screen.  These are prepared in the isw.eq.8 part of your element (look at the elements in any of the solid modules to see how we do the projections).  You can also project the strains, in fact they are done in the same part under different numbers.  You can use the PLOT STRAin command to display but in fact it is just using different numbers from the PLOT STREss projections.

[xuehanbing]

Dear taylor:
       tayor,Thanks for your explaination,I have a little confusion for your reply.  I want to get strain  nephogram based on Hill modle by feap, Plastic deformation of the user-defined modle coours by check mises stress  nephogram(pstr 6),that is to say,I want to get modle which is deformed by feap,or what I want is displaying on screen.

[xuehanbing]

Dear Yaakon:
What does "elseif(isw.eq.4)"  and "istv" denote?
 Regard.

[Yaakov]

Hi,

1.)  "elseif(isw.eq.4)" loops mean:  " the isw.eq.4 part "

2.) check the value of istv, did you use "istv" in your user element (isw.eq.1)? if not, maybe you find the reason that we should give a value of "ISTV" at first.

Kind Regards, Yaakov