Given that for an element in a body of homogenous isotropic material subjected to plane stress; $ε_{x,} ε_{y}$ and $ε_{z}$ are

normal strains in $x$ , $y$ and $z$ directions respectively and $μ$ is the Poissi

- 1
  
  $ε_{x} + ε_{y} + ε_{z}$
- 2
  
  $ε_{x} - μ (ε_{y} + ε_{z})$
- 3
  
  $μ (ε_{x} + ε_{y} + ε_{z})$
- 4
  
  $\frac{1}{ε x} + \frac{1}{ε y} + \frac{1}{ε z}$

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