week 3

Question 1

what leads to deformation

Answer 1

• applying a force results in strain
• strain causes stress on the system
• stress results in deformation

Question 2

equation of strain

Answer 2

change in length/ length

Question 3

what is young’s modulus

Answer 3

stress/strain = P/ (change in L/L)

Question 4

what is shear modulus

Answer 4

• when a sample is subjected to a shear force, the stress is referred to as a shear stress, T
• shear strain y = change in x/y = tan theta
• shear modulus G is the ratio of shear stress and strain G = T/y.
• it can be expressed as G = E/2(1+v), where E is the Young’s modulus and v is the Poisson’s ratio.