It is the one which fulfils the international quality standards documented in:
ISO 4210 - Safety requirements for bicycles (Superseded: EN 14764 – city and trekking bicycles, EN 14766 – Mountain bicycles, EN 14781 – Racing bicycles)
EN 14872 – Accessoires for bicycles
ASTM F2273 – Standard Test Methods for Bicycle Forks
ASTM F2274 – Standard Specification for Condition 3 Bicycle Forks
ASTM F2711 - Standard Test Methods for Bicycle Frames
16 CFR 1512 – Requirements for bicycles
Above standards describe in details the requirements how bicycle and individual parts shall be design and which tests shall fulfil to assure durability and safety.
An example of bicycle parts test is shown.
During testing various service loads are simulated like: standing on the pedals, cyclic jumping, braking, impact and crash loads. The most common form of frame failure is fatigue failure. Cyclic loads cause initiation and propagation of fatigue cracks, especially in the notch regions like weld toe & root. Depends on the bicycle type (mountain, racing, city) different tests are required to verify the design.
Example of fatigue test according to EN 14766
Result of FE analysis of bicycle frame – stress contour plot
The virtual bicycle tests are conducted with the use of dedicated engineering software for advanced finite element analysis which ensure good agreement with the test.
VKB Tech offers FEA services including:
Structural analysis with material nonlinearities and contact phenomena
Fatigue analysis of steel, aluminium ,composites components and welds
Impact analysis – fork and frame impact test
FEA and modelling of composites components like carbon-fibre (CFRP, CRP, CFRTP) frames and forks
The application of special modelling technique of weld joints (submodeling) allowing us to accurately predict stress amplitudes at weld toe/root, that is where usually fatigue cracks starts. Knowing the stress range and material fatigue data we can accurately predict durability performance at the early design stage and efficiently improve the design to avoid potential issue during real testing.
Submodeling of welded joint in bicycle frame
You have a frame design or a concept, but you don't know whether your frame is strong enough. We can test it in our virtual lab by conducting strength and durability tests according to ISO 4210-6 standard. We create FE model based on delivered CAD geometry file (.igs or .stp) or 2D drawings/sketches. Within few days you will get an answer whether your frame will perform well during services and whether and how improve the design.
Please contact us for more information or if you wish to talk to us about a specific project.