Force graphs and stress-strain graphs

  1. I know what a force-extension graph looks like.

    DOes a force-compression graph look the same just with different axis?
    (compression on the x axis NOT extension)

    DOes a compressive-strain graph (Young Modulus) look the same as a tensile stress-strain graph?

    if not what do they look like

    thanks
     
  2. jcsd
  3. Dadface

    Dadface 2,084
    Gold Member

    What do you think?
     
  4. I think that they would be the same but I was just clarifying

    Am I correct?
     
    Last edited: Nov 8, 2010
  5. Dadface

    Dadface 2,084
    Gold Member

    Can you think of any sample of any material which when compressed acts in a similar way to when stretched?
     
  6. A slinky spring?
     
  7. Dadface

    Dadface 2,084
    Gold Member

    I am now imagining a spring where the loops are not touching.When compressed the spring may display a Hooke's law type of behaviour but only until the loops actually make contact in which case any further compressive force tends to laterally distort the spring and or compress the material from which the spring is made from.Any resulting compression will be extremely (possibly immeasurably) small.Depending on the exact structure of the spring the Hooke's law type extension can be much greater than the compression and exceeding the elastic limit can result in the spring displaying increasing extensions similar to those displayed by ductile materials going into plastic regions.In short,with this example and others I can think of I can see some similarities between stretching and compressing but only for a narrow region surrounding the unstretched/uncompressed length.
     
  8. For compression stress-strain graphs it would be the same then? or not?
     
    Last edited: Nov 8, 2010
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