HELICAL SPRINGS | |
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FOLLOWING DIN EN 13906-1,2,3 | |

Order : | Dware |

Project : | HeliSpring |

Subproject : | Dimensioning compression spring |

Project item : | Metallfedern |

Spring ID : | S.198 |

Calculated by : | André Dewispelaere |

Organization : | Dware |

Date : | 26/07/2021 |

Spring wire grade |
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Nr, Cl, Spring Wire Grade , E, G, rho, Rm1, Rco |

125, DM, EN 10270-1 DM , 206000, 81500, 7.85, 1980, 740 |

Calculated wire properties | Symbol | Unit | Value |
---|---|---|---|

Wire diameter | d | mm | 5.000 |

Minimum value tensile strength | R_{m} |
N/mm˛ | 1460 |

Modulus of rigidity | G | N/mm˛ | 81500 |

Modulus of Elasticity | E | N/mm˛ | 206000 |

Design Specifications | Symbol | Unit | Value |
---|---|---|---|

Minor axial spring force | F_{1} |
N | 280.0 |

Axial stroke | s_{h} |
mm | 21.0 |

Major axial spring force | F_{2} |
N | 620.0 |

Design stroke stress | τ_{h} |
N/mm˛ | -- |

Design major stress | τ_{2} |
N/mm˛ | -- |

Influence factor spring seat | ν | -- | 0.5 |

Number of loading cycles | N_{cy} |
Mcy | 10.000 |

Type of spring end A | ET_{A} |
-- | D squar+grnd |

Extra inactive conjoint coils | n_{naA} |
-- | 0.00 |

Type spring end B | ET_{B} |
-- | D squar+grnd |

Extra inactive conjoint coils | n_{naB} |
-- | 0.00 |

Outside diameter not greater than | D_{e} |
mm | 40.0 |

Target coil ratio | w | -- | 0.00 |

Coiling | -- | -- | cold |

Shot peening | -- | -- | No |

Hand of coiling | -- | -- | right |

Geometry calculation | Symbol | Unit | Value |

Calculated wire diameter | d_{c} |
mm | 4.80 |

Selected wire diameter | d | mm | 5.000 |

Diameter deviation | A_{d} |
mm | 0.025 |

Mean diameter of coil | D_{} |
mm | 35.00 |

Spring index | w | -- | 7.00 |

Outside diameter of spring | D_{e} |
mm | 40.0 |

Inside diameter of spring | D_{i} |
mm | 30.0 |

Required spring rate | R_{r} |
N/mm | 16.190 |

Number of active coils | n | -- | 9.50 |

Spring rate | R | N/mm | 15.632 |

Sum of smallest coil spaces | S_{a} |
N m | 12.3 |

Total number of coils | n_{t} |
-- | 11.5 |

Compressed length to solid state | L_{c} |
mm | 57.8 |

Minimum permissible spring length | L_{n} |
mm | 70.1 |

Nominal free length of spring | L_{0} |
mm | 118.6 |

Coil pitch at free length | m_{0} |
mm | 10.900 |

Coil space at free length | a_{0} |
mm | 5.900 |

Calculation spring diagram | Symbol | Unit | Value |

Minor axial deflection | s_{1} |
mm | 17.9 |

Length at minor axial deflection | L_{1} |
mm | 100.7 |

Minor axial spring force | F_{1} |
N | 280.0 |

Major axial deflection | s_{2} |
mm | 38.9 |

Length at major axial deflection | L_{2} |
mm | 79.7 |

Calculated major axial load force | F_{2} |
N | 608 |

Maximum permissible deflection | s_{n} |
mm | 48.6 |

Minimum permissible spring length | L_{n} |
mm | 70.1 |

Maximum permissible spring force | F_{n} |
N | 760.1 |

Axial deflection to solid state | s_{c} |
mm | 60.8 |

Compressed length to solid state | L_{c} |
mm | 57.8 |

Spring force at solid state | F_{cth} |
N | 950.0 |

Strength calculation | Symbol | Unit | Value |

Stress correction factor | k | -- | 1.200 |

Corrected minor torsional stress | τ_{k1} |
N/mm˛ | 240 |

Corrected major torsional stress | τ_{k2} |
N/mm˛ | 520 |

Permissible static torsion stress | τ_{P} |
N/mm˛ | 730 |

Safety factor major torsion stress | S_{F} |
-- | 1.40 |

Torsion stress max permiss deflect | τ_{n} |
N/mm˛ | 542 |

Permissible static torsion stress | τ_{P} |
N/mm˛ | 730 |

Safety fact max permiss deflection | S_{Fn} |
-- | 1.35 |

Stress at solid state | τ_{c} |
N/mm˛ | 677 |

Permissible stress at solid state | τ_{cP} |
N/mm˛ | 820 |

Safety factor stress at solid stat | S_{Fc} |
-- | 1.21 |

Strength domain | -- | -- | endurance |

Permissible endurance stress | τ_{eN} |
N/mm˛ | 328 |

Permissible upper torsion stress | τ_{kO} |
N/mm˛ | 537 |

Safety factor upper torsion stress | S_{FO} |
-- | 1.03 |

Lower torsional stress | τ_{kU} |
N/mm˛ | 240 |

Corrected stroke torsional stress | τ_{kh} |
N/mm˛ | 281 |

Permissible stroke stress | τ_{kH} |
N/mm˛ | 298 |

Safety factor on stroke stress | S_{FH} |
-- | 1.06 |

Weight calculation | Symbol | Unit | Value |

Length of wire for spring | l_{w} |
mm | 1270 |

Mass of spring | m_{w} |
g | 196 |

Calculation buckling diagram | Symbol | Unit | Value |

Influence factor spring seat | ν | -- | 0.5 |

Slenderness grade | νL_{0}/D_{} |
-- | 1.694 |

Major deflection/length ratio | s_{2}/L_{0} |
-- | 0.328 |

Buckling at deflection of | s_{K} |
mm | 0.0 |

Safety factor on buckling | S_{K} |
-- | 0.00 |

Is spring buckling safe | -- | -- | Yes |