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Tensile Strain

  1. Jul 30, 2009 #1
    1. The problem statement, all variables and given/known data

    If a glass rod of diameter 1cm is loaded with a 1kN tensile load and has a young's modulus of 70 GPa, what is the tensile strain?

    2. Relevant equations



    3. The attempt at a solution

    Im sure if somebody could tell me the formula for this i could work it out easily
     
  2. jcsd
  3. Jul 30, 2009 #2

    alphysicist

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    Homework Helper

    Hi tone999,

    Young's modulus is an example of a modulus of elasticity. What is the mathematical definition of a modulus of elasticity?
     
  4. Aug 3, 2009 #3
    elastic modulus = stress/strain

    70,000 = 0.01/1000

    Answer in pascal units

    Is this anywhere near the correct method?
     
  5. Aug 3, 2009 #4
    Strain = 1kN / ((pi*1^2)/4 * 70GPa) = 1kN / (.7854cm^3 * 70GPa)

    Strain = 1000N / (785mm^2 * 70000 N/mm^2) = 0.000182

    Is this correct now?
     
  6. Aug 5, 2009 #5

    alphysicist

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    Yes, that looks right to me.
     
  7. Aug 13, 2009 #6
    If that rod, with thermal expansion coefficient 6 x10^-6 is cooled
    by 20 OC, what is the resulting thermal strain?

    Is this just 6x10^-6/(20)(0.000182)=5.46x10^-11
     
    Last edited: Aug 13, 2009
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