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Isothermal stress coefficient

Values for calculation

$δ$
$φ_{δδ}$
$φ_δ$
$ρ$ $\mathrm{kg\cdot m^{-3}}$
$\text{Region}$

Calculation

Isothermal stress coefficient

$\text{if }\ \text{Region}= 3$
$$β_p=\left(2+\cfrac{δ\cdot φ_{δδ}}{φ_δ}\right)\cdot ρ$$
$\text{else}$
$$β_p=0$$