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Difference between force-elongation and stress - strain diagram?

  1. Aug 14, 2006 #1
    what is the difference between force-elongation and stress - strain diagram??

    pls show some example such as diagrams for future reference

    thanx
     
  2. jcsd
  3. Aug 14, 2006 #2

    Astronuc

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    Staff: Mentor

    Well, stress is derived from force. Stress is the force divided by cross-sectional area.

    By elongation, does one mean displacement? Strain is derived from elongation or displacement, and is the ratio of the change in elongation (displacement) to the intial elongation (displacement).

    I believe that the term "force-elongation" is more commonly known as "load-displacement", and load and displacement are 'directly measured', and from these the corresponding stress and strain are calculated. Nowadays, tensile test machines have digital instrumentation and software to automatically calculate stress and strain from measured load and displacement.
     
  4. Aug 15, 2006 #3
    may i have some diagrams for the two cases above??

    thanx
     
  5. Aug 16, 2006 #4

    Astronuc

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    Staff: Mentor

    http://www-ec.njit.edu/civil/som/define.html - find the entry for Stress - Strain Diagram. This page is useful for definitions.

    Also see this discussion - http://www.ae.msstate.edu/vlsm/materials/stress_strain_diagrams/stress_strain_diagrams.htm

    http://www.ni.com/pdf/academic/us/me105_lab3_2003.pdf (save target as) - useful discussion of engineering vs true stress-strain.

    http://www.tpub.com/content/doe/h1017v1/css/h1017v1_69.htm

    http://physics.uwstout.edu/Statstr/statics/Stress/strs32.htm

    http://web.mit.edu/course/3/3.11/www/pset03/Definitions.pdf - (save target as)

    Here is an image of a load-displacement curve, however the person placed stress and strain titles next to it and describes the image as a stress-strain curve. The title of the abscissa is "Deflection (in)", which indicates elongation or displacement.
    http://invsee.asu.edu/srinivas/stress-strain/phase.html

    This might be useful - http://scholar.lib.vt.edu/theses/available/etd-6197-6556/unrestricted/ch3.PDF (use save target as)

    I am unable to find an example of a load-displacement curve and the derived stress-strain curve.
     
  6. Aug 16, 2006 #5
    thanx.........
     
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