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Mr_Snips

20-02-08 04:21 AM

Design and Strength Analysis

Here are to stress Analysis pictures. The first one would be as if you layed your bike down and there was force directly inwards on the end of the peg. There is a 1000 pound force acting on the end of the peg and the maximum the piece bends is .26 inches.
http://i30.tinypic.com/6ftjso.jpg

This picture is such that a 500 pound man was standing on a single point attached 3 inches from the point where the peg mounts. Maximum deflection is only .17 inches. Pretty good considering it is simply machined 6061 aluminum.
http://i29.tinypic.com/2ajc8dy.jpg

That is the basic design, moved the peg about 1 inch upwards and about 1 inch back. This is just a preliminary, expect strength to increase as design progresses. Also please feel free to comment and let me know what YOU would like to see in this. Thank you, Nate
http://i31.tinypic.com/s1ovvc.jpg

Mr_Snips

20-02-08 04:22 AM

Re: Design and Strength Analysis

Note now that the new design is actually as follows with the cutout center.
http://i28.tinypic.com/iqiwy9.jpg

blueto

20-02-08 07:34 AM

Re: Design and Strength Analysis

can you stress anaylsis my missus please?

John 675

20-02-08 07:39 AM

Re: Design and Strength Analysis

they are looking good snips I'm interested in seeing the finished product

blueto

20-02-08 09:36 AM

Re: Design and Strength Analysis

WOULD it make a differnce if the peg was square not round?

embee

20-02-08 10:37 AM

Re: Design and Strength Analysis

Show us the stress plot rather than the deflection plot, that's what determines whether it will break.

Blue_SV650S

20-02-08 10:41 AM

Re: Design and Strength Analysis

Quote:

Originally Posted by embee (Post 1423714)

Show us the stress plot rather than the deflection plot, that's what determines whether it will break.

In my experience you WANT the peg to break (in an off - not when just standing on it :D) ... it is replicable and will save the more expensive rearset part ...

dizzyblonde

20-02-08 12:43 PM

Re: Design and Strength Analysis

Quote:

Originally Posted by yorkie_chris (Post 1423530)

Not good bearings in those though, look fairly cheap to me.

Pretty cool use of CAD, just learning that at the moment, is that some sort of FEA built in to CAD? If so what program are you using?

One thing to remember though, the deflection is not important, it's whether thats elastic or plastic deformation of the part, and also most importantly, you can make a completely rigid footpeg hanger, which will take 10 minutes and £50 to replace, but if the bike goes down hard it will break the frame tab, which could be £300 and half a day to replace the frame. The rearset should snap BEFORE the frame does!

hth

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