PHYSICAL QUANTITY

Mechanical stress: formulas and units of measurement

Mechanical stress: symbol σ, unit Pa. Formulas and explanations for Mechanics.

\sigma

\text{Pa}

pascal

KEY CONNECTIONS

Formulas

σ = \frac{F}{S}

σ = F / S

σ = E ∣ ε ∣

σ = E|ε|

ε = \frac{Δ l}{l _{0}}

ε = Δl / l₀

NOTATION

$\sigma$: Mechanical stress is the internal force per unit cross-sectional area.
$F$: Force is a measure of the interaction of bodies that changes their movement or shape.
$S$: Area is the size of a surface or cross section.
$E$: Young's modulus is a characteristic of a material's resistance to elastic deformation.
$\varepsilon$: Relative deformation is the proportion of change in length compared to the initial length.
$\Delta l$: Elongation is a change in the length of a body during deformation.
$l_0$: Initial length - the length of the body before deformation.