Bamboo Bike Frame Deflection Strength Test #3 - The Samurai - Part 2
To comply with Australian Standard AS/NZS 1927:1998 a bike frame has to undergo the following test:
a) Anchor the rear wheel axle attachment points.
(b) Apply a force of 890 N to the front axle attachment point towards and in line with the rear wheel axle and from the deflection reading compute the energy absorbed in joules.
(c) Should the energy absorption reading at 890 N be less than 40 J increase the force until this figure is attained.
The test apparatus I constructed consists of a long clamp, some bathroom scales and a bunch of spacers to make it all fit and stay put.
I took a series of distance readings at various force increments and figured out the resulting energy (or work) being absorbed by the frame based on this formula:
Work(Joules) = Force(Newtons) x Distance(metres)
Results:
Force | Distance
40kg | 1cm
65kg | 1.5cm
90kg | 2cm
130kg | 3.5cm
At 130KG (1274N) the frame and fork moved 3.5cm, giving a resulting energy absorption of 44.59J, thus passing the required Australian Standards for Frame and Fork Assembly.
Also see the previous video here ( • Bamboo Bike Frame Deflection Strength Test... ) where I log the initial tests up to 90kg.