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TBIS 79010:2019
4.1.1.5 Fatigue test
The force for fatigue tests is to be applied and released progressively, not to exceed
10 Hz. The tightness of fasteners according to manufacturer's recommended torque
can be re-checked not later than 1,000 test cycles to allow for the initial settling of
the component assembly. (This is considered applicable to all components, where
fasteners are present for clamping). The test bench shall be qualified to meet
dynamic requirements of 4.1.1.4.
4.1.1.6 Fatigue test for composite components
For fatigue test for composite components, the initial value of displacement
(peak-to-peak value) is taken after 1,000 cycles and before 2,000 cycles.
4.1.1.7 Plastic material test ambient temperature
All strength tests involving any plastic materials shall be pre-conditioned for two
hours and tested at an ambient temperature of 23 °C ± 5 °C.
4.1.1.8 Crack detection methods
Standardised methods should be used to emphasize the presence of cracks where
visible cracks are specified as criteria of failure in tests specified in this standard.
NOTE For example, suitable dye-penetrant methods are specified in ISO 3452-1,ISO 3452-2,
ISO 3452-3 and ISO 3452-4. In addition, white paint or surface treatment can be used to aid
in detection for composite materials.
4.1.2 Sharp edges
Exposed edges that could come into contact with the rider's hands, legs, etc., during
normal riding or normal handling and normal maintenance shall not be sharp, e.g.
deburred, broken, rolled or processed with comparable techniques.
NOTE Refer to ISO 13715:2000.
4.1.3 Security and strength of safety-related fasteners
4.1.3.1 Security of screws
Any screws used in the assembly of suspension systems or screws used to attach
bracket attached electric generators, brake-mechanisms and mud-guards to the
frame or fork, and the saddle to the seat-post shall be provided with suitable locking
devices, e.g. lock-washers, lock-nuts, thread locking compound or stiff nuts.
NOTE 1 : The screws used to attach hub-generator are not included.
NOTE 2 : mechanical and physical properties of bolts are specified in ISO 898-1.
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