MecMovies 4.0 : M12.13: Absolute Maximum Shear Stress

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As an illustration, consider a plane stress example in which $σ_{x} = 40 M P a$ , $σ_{y} = 80 M P a$ , and $τ_{x y} = 0 M P a$ . In this example, note that the $x$ and $y$ faces are principal planes (i.e., $σ_{p 1} = σ_{y}$ and $σ_{p 2} = σ_{x}$ ).