Force required to compress or extend a helical spring.

[mvpunekar]

Is force required to compress or extend a helical spring is same or different.

For example a spring has spring rate of 450 N/mm, so if in compression if 450 N is required to produce 1 mm displacement from free position whether in tension same 450 N force will be required to produce 1 mm displacement from free position or this force value would be different ?

 

[Pkruse]

In theory, it is the same. In practice, it is extremely close to the same so long as you stay well below the yield strength of the material.

 

[mvpunekar]

In theory, it is the same. In practice, it is extremely close to the same so long as you stay well below the yield strength of the material.

Are you sure that these values will be same?

 

[Q_Goest]

Are you sure that these values will be same?

Yes, they will be the same.

 

[erichp]

In addition to approaching the yield strength, there will be a stiffness non-linearity in compression as the spring approaches its fully-compressed length, when self-contact occurs.

 

[serbring]

Is force required to compress or extend a helical spring is same or different.

For example a spring has spring rate of 450 N/mm, so if in compression if 450 N is required to produce 1 mm displacement from free position whether in tension same 450 N force will be required to produce 1 mm displacement from free position or this force value would be different ?

it depends by the spring. There are springs with different rates.

 

[Dr Bwts]

Also depends on how the spring is coiled.

If it is tightly coiled then compression is more likely to cause buckling than axial compression. In which case a simple Hooke's law assumtion will be invalid.