or you check the latest peer reviewed research: the mechanical engineer way, such as this page hosted on sheldonbrown site.You try to reinforce the connection, but the solution maybe is just to have a top tube with a larger diameter, or shorter, to dampen the vibrations/resonance. However, with the use you realize that such a tube will produce some resonance and some vibration, so for some unlucky reasons hysteresis will cause the connection of the seat stays (calculated to be long 22 cm, diameter 1.2 cm, thickness 1.9 mm) to fail on average after 500 km.
#A 45 KG TOBOGGAN AND RIDER DECELERATE TRIAL#
a lot of trial and error.Īn example: you draw your ideal wood bike, knowing the tensile strength and other parameters of wood you calculate that the top tube should be long 30cm, have a diameter 1.8 cm and a thickness of 2 mm. If you then bring into the picture a material that evolves with time, like wood, you should expect. Even if you can calculate the correct thickness for all "reasonable" impacts and forces thrown at a bicycle, you still need to take into account that the bicycle will be used, so the material will undergo hysteresis.Ī frame can stand a single impact providing a force of X, but it may fail after one hundred impacts of smaller force X/1000 (yes, you are reading correct, standing a single impact of force X, but failing after a cumulative impact force of 1/10 of X). I know this is not a mainstream material choice but has been used to pretty good effect here). Probably will eventually try to machine said frame from wood.
#A 45 KG TOBOGGAN AND RIDER DECELERATE SOFTWARE#
(For context not relevant for this question but perhaps of interest to the casual reader, I'd like to use these forces and a generative design-based software tool (Autodesk Fusion360) to design a bike frame that is near optimal for someone of my size and desired riding style. My question is: what are reasonable forces to be used in these load scenarios? I assume there are some standard forces used by bicycle designers for different load cases, but thus far I haven't been able to find these loads. maximum force applied during standing pedaling, force on seat tube when sitting, cornering at high speeds, braking, etc.) Given these forces, I'd be able to correctly size each tube/member. by calculating the force on each member in a number of standard load scenarios (i.e. I'd start with some basic frame geometries, then I assume I'd calculate the necessary member sizes, stiffnesses, etc. Let's say I was going to design a bike frame for a specific size of individual.
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