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Helical torsion spring round (given the force on spring)

Helical torsion spring round D d φ r F
Helical torsion spring round

Values for calculation

$d$ $\mathrm{mm}$
$D$ $\mathrm{mm}$
$r$ $\mathrm{mm}$
$n$
$E$ $\mathrm{GPa}$
$F$ $\mathrm{N}$
$σ_{adm}$ $\mathrm{MPa}$

Calculation

Applied torque moment

$$M=F\cdot r\cdot 10^{-3}$$
$M=F\cdot r\cdot 10^{-3}$
Equations in LaTeX code
M=F\cdot r\cdot 10^{-3}

Bending stress

$$σ_B=\cfrac{32\cdot M\cdot 10^3}{π\cdot d^3}$$
$σ_B=\cfrac{32\cdot M\cdot 10^3}{π\cdot d^3}$
Equations in LaTeX code
σ_B=\cfrac{32\cdot M\cdot 10^3}{π\cdot d^3}
$$σ_B\le σ_{adm}$$
$σ_B\le σ_{adm}$
Equations in LaTeX code
σ_B\le σ_{adm}

Safety factor

$$S_F=\cfrac{σ_{adm}}{σ_B}$$
$S_F=\cfrac{σ_{adm}}{σ_B}$
Equations in LaTeX code
S_F=\cfrac{σ_{adm}}{σ_B}

Spring angular deflection

$$φ=\cfrac{2\cdot π\cdot D\cdot n\cdot σ_B}{E\cdot 10^3\cdot d}\cdot\cfrac{180}{π}$$
$φ=\cfrac{2\cdot π\cdot D\cdot n\cdot σ_B}{E\cdot 10^3\cdot d}\cdot\cfrac{180}{π}$
Equations in LaTeX code
φ=\cfrac{2\cdot π\cdot D\cdot n\cdot σ_B}{E\cdot 10^3\cdot d}\cdot\cfrac{180}{π}

Spring stiffness

$$k=\cfrac{F}{r\cdot 10^{-3}\cdot φ\cdot\cfrac{π}{180}}$$
$k=\cfrac{F}{r\cdot 10^{-3}\cdot φ\cdot\cfrac{π}{180}}$
Equations in LaTeX code
k=\cfrac{F}{r\cdot 10^{-3}\cdot φ\cdot\cfrac{π}{180}}

Energy stored

$$E_p=\cfrac{F\cdot r\cdot 10^{-3}\cdot φ\cdot\cfrac{π}{180}}{2}$$
$E_p=\cfrac{F\cdot r\cdot 10^{-3}\cdot φ\cdot\cfrac{π}{180}}{2}$
Equations in LaTeX code
E_p=\cfrac{F\cdot r\cdot 10^{-3}\cdot φ\cdot\cfrac{π}{180}}{2}
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