Effect of taper on spring nonlinearity - How does taper impact the k3/k1 ratio?

Hal Jordan · Post by **Hal Jordan** » Mon Nov 05, 2012 11:36 pm

Ah - that explains it.

Thanks Vince.

VGB · Post by **VGB** » Wed Nov 07, 2012 11:46 am

Walter

I only wish it did solve everything and we could go on to tea and medals. While the real world measurements prove that bending is not caused solely by the strain of the fibres, it would be very arrogant to claim on the basis of disproving one hypotheses that bending is entirely due to ovalisation.

I have been re-reading Tatting and doing some other research and believe that the truth lies in-between the two. On a purely theoretical model, I would expect that there are two separate contributions to the effect, one from the strain on the fibres due to longitudinal bending of the rod and the other from ovalisation of the bent section. However, both of these deformations must be accounted for in the design or the rod would fail prematurely.

I have seen examples where the energy absorption of each effect is calculated individually and then summed so produce a quantified figure. However, the practical engineer in me says that is still an approximation because the longitudinal and axial fibres are not laid at 90 degrees to each other and that a quick test would be best, followed by lots of beer.

your round :p

Vince

Merlin · Post by **Merlin** » Fri Nov 09, 2012 5:59 pm

Hi everybody

Ovalization data from computing center expected beginning of december.

Merlin

Hal Jordan · Post by **Hal Jordan** » Fri Nov 09, 2012 6:13 pm

Merlin -

We shall look forward to the results.

Out of curiousity - why the need for the computing center? Is it computing power, software or both? :on2long:

Merlin · Post by **Merlin** » Fri Nov 09, 2012 6:20 pm

Both Walter, these guys are pro and work for industry. We are little boys by comparison with our models

Hal Jordan · Post by **Hal Jordan** » Fri Nov 09, 2012 6:38 pm

VGB · Post by **VGB** » Sat Nov 10, 2012 9:15 am

Thanks for the update Merlin. As a matter of interest, what was the input data for the model. I've been looking at the structural models at work and the load paths appear susceptible to material construction

VGB · Post by **VGB** » Sun Nov 11, 2012 9:42 am

An interesting approach to the problem; has anyone cast one?:

http://www.hexagraph.com/HTMLarticles/caseSolid.html

Merlin · Post by **Merlin** » Mon Dec 10, 2012 7:17 pm

Hi everybody

Computer center results about ovalization have just been received. Is there a bookmaker somewhere around here?

I am preparing an abstract so that you can benefit from the findings. I just need a few days for that.

Merlin

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