Designing a simple cantilever spring
Designing a simple cantilever spring
(OP)
I am trying to design a simple cantilever spring that needs to bend through 90 degrees. Do I use simple cantilever beam theory to determine the stress?
I am going to use 1055-1065 spring steel approximately 0.5mm thick. The beam will be approx 50mm long and 4mm wide.
| force
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| force
Regards,
Ian.
I am going to use 1055-1065 spring steel approximately 0.5mm thick. The beam will be approx 50mm long and 4mm wide.
| force
------------------------
|
|
-----
| \
\
|
| force
Regards,
Ian.
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RE: Designing a simple cantilever spring
But E/R=s/y=M/I still holds true
so all you need to do is determine the bending moment at each point along the beam, then you can work out R, and then you can work out how much it bends. The problem is that the BM will depend on the results from the rest of the beam. It is unlikley to have a nice analytical solution.
However, in theory that isn't a problem, since your boundary conditions are straightforward, and a numerical solution will be good enough.
Cheers
Greg Locock
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RE: Designing a simple cantilever spring
RE: Designing a simple cantilever spring
RE: Designing a simple cantilever spring
I can get some pieces of light gauge spring steel and perform some bend tests to see if I am exceeding the yield strength, but am hoping to refine my design before hand (tapering the finger width).
Thanks Greg & israelkk for your posts. I will work through the large deflection attachment now and see if I can get my head around it. Of course the solution is linked to fly fishing!
Ian.
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RE: Designing a simple cantilever spring
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Designing a simple cantilever spring
I get the following results, using the approach I suggested. It agrees in the linear range with the usual equation to better than 0.1%.
It ignores axial and shear effects.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Designing a simple cantilever spring
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Designing a simple cantilever spring
RE: Designing a simple cantilever spring
To my best knowledge, Spring Designer Handbook by Carlson doesn't deal with the case of large deflection flat cantilever springs.
RE: Designing a simple cantilever spring
RE: Designing a simple cantilever spring
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.