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Homework Help: What is Incompressible material?

  1. Oct 28, 2015 #1
    I sent a summary about ultrasound elastography to my teacher and somehow I wrote incompressible material in my paper. now he wants me to really explain him what is Incompressible material.
    I looked at internet about compressibility and Poisson ratio but doesn't still give a good understanding of incompressibility . can any one give me a solid answer to this question.
  2. jcsd
  3. Oct 28, 2015 #2
    I realize you don't fully understand incompressibility, but please tell us your current understanding of this concept.

  4. Oct 28, 2015 #3
    this is what I have written so far and I have understood :

    I have actually understood it. the materials that can not be compresses under a stress like a rubber. but I can not give a scientific definition about it
  5. Oct 28, 2015 #4
    The definition is: the derivative of the specific volume (volume per unit mass) with respect to the sum of the three principal stresses is equal to zero.

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