Which of the following has the highest lateral strain when there

SOLUTION

Explanation:

Lateral strain:

• The strain at right angles to the direction of applied load is known as LATERAL STRAIN.
• It is the strain caused in the transvers direction of the body due to longitudinal force.
• It depends on the Poisson's ratio(μ) of the material.

\(μ =\frac {-lateral~strain}{longitudinal~ stress}\) 

∴ lateral strain ∝ μ 

and 'μ' ⇒ rubber > Bronze > Copper > Iron

Hence Rubber has highest lateral strain.

• Universal range of Poisson's ratio (μ) = -1 to 0.5
• But range of 'μ' for most of material (>99.9%) is 0 to 0.5 
• For perfectly plastic material 'μ' = 0.5, example- Pure rubber
• For elastic material 'μ' = 0.25 - 0.42

• Material	Poisson's ratio(μ)
  Rubber	0.4999
  Gold	0.43
  Bronze	0.34
  Copper	0.33
  Aluminium alloy	0.32
  Steel	0.27 - 0.30
  Iron	0.24
  Glass	0.2
  Foam	0.10 - 0.50
  Cork	0