Introduction: Direct Stress or Normal Stress



Stress normal to the plane is usually denoted "normal stress" and can be expressed as
σ = Fn / A (1)
where
σ = normal stress ((Pa) N/m2, psi)
Fn = normal component force (N, lbf)
A = area (m2, in2)

Shear Stress
Stress parallel to the plane is usually denoted "shear stress" and can be expressed as
τ = Fp / A (2)
where
τ = shear stress ((Pa) N/m2, psi)
Fp = parallel component force (N, lbf)
A = area (m2, in2)






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