# Real life examples of spring energy storage

1. Aug 11, 2014

### Ryan_m_b

Staff Emeritus
Tonight I've had a deceptively simple question that I've found maddeningly difficult to get an answer to. What I'm looking for is a list of springs with information on how much they can be compressed and how much energy they store. E.g.:

Steel spring from company A has dimensions X, Y, Z and can be compressed U% holding Vj of energy.

Instead though all I can find is explanations of Hooke's law and hypothetical examples. Most sites seem to assume that the person asking has a spring they want to rest and so can just figure out energy storage by piling weights on and working through Hooke's law. Whereas I'm just looking for a simple set of figures.

Any pointers to such a fact sheet would be greatly appreciated!

2. Aug 11, 2014

### Staff: Mentor

Look at garage door opener counterweight springs?

3. Aug 11, 2014

### Ryan_m_b

Staff Emeritus
Do you mean google counterweight springs or go to a garage and observe on directly? I can do (and in another window currently are doing) the former but I live in a block of flats without a garage so the latter would be difficult.

4. Aug 11, 2014

### Staff: Mentor

I'd try garage door installation websites, and maybe wikipedia. Let me have a look at wikipedia...

5. Aug 11, 2014

### Ryan_m_b

Staff Emeritus
Working my way through this one at the moment. Cheers for the help

6. Aug 11, 2014

### Staff: Mentor

7. Aug 11, 2014

### Staff: Mentor

Last edited by a moderator: Sep 25, 2014
8. Aug 11, 2014

### Ryan_m_b

Staff Emeritus
Will do! Thanks.

9. Aug 11, 2014

### Ryan_m_b

Staff Emeritus
Valve springs seem to have come up trumps, found http://dairally.net/daihard/chas/MiscCalculators/DaiValveSpring.htm [Broken] that has lots of information and calculators. Seems enough to satisfy my curiosity for now.

Last edited by a moderator: May 6, 2017
10. Aug 11, 2014

### Staff: Mentor

11. Aug 11, 2014

### Ryan_m_b

Staff Emeritus
Lol sorry, to come up trumps is to be successful/provide a solution

12. Aug 11, 2014

### AlephZero

Another example would be the gas spring in your office chair (assuming you have an office). The energy stored = mgh where m is your mass and h is the distance it is compressed.

13. Aug 12, 2014

### Lok

A mechanical watch.

14. Aug 12, 2014

### Lok

15. Feb 3, 2017

### Baluncore

Fundamentally, energy is stored in the elastic material. Look at a stress – strain diagram, identify the extent of elastic deformation, before plastic deformation or failure. You then know the maximum energy storage possible for a particular mass of that material. The shape of the spring you make from that material will determine the particular spring constant.
https://en.wikipedia.org/wiki/Hooke's_law#General_application_to_elastic_materials

16. Feb 3, 2017

### CWatters

What size springs? This site allows you to specify the diameter, relaxed length and spring constant (Rate). I put some numbers in and it came up with 17,000 to choose from and they were just the compression springs. They also do extension, torsion and conical springs.

https://www.thespringstore.com/tech-info/off-the-shelf-springs.html?category_id=3#

It doesn't give you the energy storage but that can be easily calculated from the rate (k) and the suggested maximum deflection (x).

E = 0.5kx2