Not of you in the middle of a road, no. When I looked at your post last night ONLY the bottom picture of the 3 above was present. So I had no idea what had actually failed or its importance.With the trike like what?
No picture to go with the statement; and we all enjoy a good laugh.
Therein is demonstrated the engineering perfection of the diamond frame where all the forces are dissipated down the tubes. Nothing is thick steel because it doesn't need to be. Pretty much anything we make is a fudamentally weaker design relying on the strength of individual pieces of steel and the quality of the weld.When you see the thinness of the materials that standard bikes are made of you would think that 3mm metal in this critical area would be sufficient.
Not sure if I am thinking correctly about this but I would have expected the bottom plate to be trying to pull apart and the top plate to be compressed together. Which is the opposite of what appears to have happened? I hope today's ride to your Mother's is uneventful.Hi all
Thanks guys for the input.
I have repaired it in a fashion that increases the plate from 3mm to 6mm hopefully this will banish this gremlin.[ although if I make this area strong enough it only moves the stress elsewhere ?]
So I need to find out why it happened ?
a) so will it happen again ?
b) can I stop it ?
c) is tilting a contributory factor ?
Looking into the side of the joint these are the forces/loads attempting to push the joint into the ground.
Now looking at my construction
1)the 3mm right angle is of infinite length compared to the 3mm plate
2) the M12 bolt and rod end bearing is also infinite length compared to the 3mm plate
This is the reason it broke where it did and not across the bolt hole , which theoretically was weaker due to the M12 hole in it.
Other forces are also at play
On the left the 2 wheels at the rear are on level ground and so the frame is horizontal and so the front wheel is vertical [ unless turning ] .
On the right the left hand wheel has encountered a bump causing the frame to tilt upwards , this tilt is transmitted to the front through the pivot and attempts to twist the front end to follow the rear.
Of course the 3mm part of the plate feels these forces the most a tearing action across it.
gee it has a hard life
So to tilting ?
Now tilting involves the elastomers allowing me to go off centre , now my gut feeling is that as long as both rear wheels stay planted on the ground the left example above tilting has no part to play in the failure.
Unless tilting causes one of the wheels to lift off the ground then we are at the right example above and so tilting could cause tearing forces across the 3mm plate.
To the best of my knowledge I have never had the Tilt#6 on 2 wheels.
So am I right ?
Where are the forces going now ?
What will happen tomorrow ?
Correct your not ?Not sure if I am thinking correctly
Both plates have the same forces on them as they are inline ?about this but I would have expected the bottom plate to be trying to pull apart and the top plate to be compressed together.
Once the top plate had parted I was still sat on it , however then the lower plate was doing all the work and so bent as it had not started to fracture ?Which is the opposite of what appears to have happened?
Nervous but achieved.I hope today's ride to your Mother's is uneventful.
Not sure this means they have the same forces TBH.Both plates have the same forces on them as they are inline ?
I most certainly will keep a very watchful eye on it after hearing of your "brown-trouser" moment; but.... mine is quite different to yours as it is:I would seriously look at your mount before you rode it , it is possible it cannot resist the forces either ?