I'm trying to solve this problem which is to find the total deformation of the bar.

I'm trying to implement the finite element approach, but I am getting way too large of numbers. Here is what I did in Excel.

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I thought my units were wrong, but they seem to be fine. The only difference from the other problem I solved was that the second boundary condition was supported; this one has a free end.

Thanks for any help.

  • 2
    $\begingroup$ If looks like you made a typo entering some of the numbers in the spreadsheet. (We don't do your homework here, so find it yourself!) $\endgroup$ – alephzero Mar 26 '19 at 0:08
  • $\begingroup$ Note that while excel is probably worlds most used programming environment, its also the hardest to debug in. $\endgroup$ – joojaa Mar 26 '19 at 6:37
  • 1
    $\begingroup$ @joojaa Well, debugging this particular error is trivial for anyone with normal vision. Neither the question nor the answer has anything much to do with finite element analysis though. $\endgroup$ – alephzero Mar 26 '19 at 9:54
  • $\begingroup$ Look for a place where you have used a negative sign instead of a positive sign. Also, keep in mind that the stiffness has a physical meaning and should have values which are reasonable. $\endgroup$ – Biswajit Banerjee Mar 27 '19 at 0:01

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