Not sure I understand this about Young's Modulus

Replies

• 

  Ramani Aswath

  David Rubiano

  is it saying that the value of the Young's modulus for some material represents the amount of stress required to double the length of that material?

  That is correct.
  Tensile Modulus is defined as the
  "ratio of Young's Modulus, Tensile Strength and Yield Strength Values for some Materials (force per unit area) along an axis to Young's Modulus, Tensile Strength and Yield Strength Values for some Materials (ratio of deformation over initial length) along that axis"
  
  Let us say that for some material for a given stress 's' the material increases the length by 0.01(1%). The Elastic modulus is s/0.01 = 100 s, which represents the stress to double the length. However, no real material can uniformly deform to actually double its initial unstressed length.
• 

  Ankush Sharma

  David Rubiano

  but is it saying that the value of the Young's modulus for some material represents the amount of stress required to double the length of that material?

  Yes exactly, but just one correction "not some materials but all the materials".
  As, elastic modulus is the ratio of stress to strain, means the amount of stress required to produce unit strain.
  Now what is the meaning of unit strain?
  Means strain=1, and when it will become 1?-- when the change in length is equal to original length, which directly means the length of material doubles up.