A tensor measure of internal forces that neighbouring particles of a continuum body exert on each other per unit area across which the force is applied.

Symbol

SI units

Oil metric units

Oil field units

Additional

$\begin{array}{l}\sigma\end{array}$

M L^-1 T^-2

Pa

kPa = 10³ Pa = 0.145038 psi

MPa = 10³ Pa = 145.038 psi

GPa = 10⁶ Pa = 145,038 psi

psi = 6894.76 Pa = 6.89476 kPa

bar = 10⁵ Pa = 100 kPa = 14.5038 psi

atm = 101,325 Pa = 101.325 kPa = 14.6959 psi

For a given surface element with nor normal vector $\begin{array}{l}{\bf n} =(n_1, \, n_2, \, n_3), \quad |{\bf n} | = \sqrt{n_1^2 +n_2^2 +n_3^2} =1\end{array}$ the stress is represented by a vector, showing direction and the value of forces exerted across a given surface element:

$\text{[math]}$

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See also

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Stress

See also