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Stress is the ratio of applied force F and cross section A, defined as "force per area".
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)
σ = Fn / A (1)
where
σ = normal stress ((Pa) N/m2, psi)
Fn = normal component force (N, lbf)
A = area (m2, in2)
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)
τ = Fp / A (2)
τ = shear stress ((Pa) N/m2, psi)
Fp = parallel component force (N, lbf)
Strain is defined as "deformation of a solid due to stress" and can be expressed as
ε = dl / lo = σ / E (3) where dl = change of length (m, in) lo = initial length (m, in) ε = unitless measure of engineering strain E = Young's modulus (Modulus of Elasticity) (Pa, psi)
ε = dl / lo = σ / E (3)
dl = change of length (m, in)
lo = initial length (m, in)
ε = unitless measure of engineering strain
E = Young's modulus (Modulus of Elasticity) (Pa, psi)
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