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Fatigue test stands
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Fatigue test stands

These simulate frequently recurring mechanical loads. The tests measure the safety of a component concerning fatigue fractures. A fatigue test stand exerts a lifetime’s equivalent of loads on a component in only a matter of hours. We offer the following test stands: :

Abbreviation

Test stand for

Applicable standards

DYNR

Frame, 3 loading cases

EN, EFBe

DYNG

Front fork, 2 loading cases

ISO 4210, EN, EFBe

DYNFG

Suspension fork, partially extended

EFBe

DYNLV

Handlebars and stem, 2 loading cases

ISO 4210, EN, EFBe

DYNS

Seat post, 3 loading cases

ISO 4210, EN, EFBe

DYNA

Crankset, 2 loading cases

ISO 4210, EN, EFBe

In connection with suitable ad-on modules all fatigue tests prescribed in EN 14764, 14766 and 14781 can be performed for frame. fork, handlebar/stem, seat post and crankset.

All test stands are operated pneumatically and controlled by a test stand control system VC.

VELO CONTROL Test stand control system
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Even slight discrepancies in the target values of testing loads during fatigue tests can lead to major differences in the number of cycles endured. Tests in which the testing loads are not controlled, can result in false evaluations of a frame’s durability. When it comes to ensuring the correct evaluation of component safety, industrial load cells and load control systems are therefore just as essential as a reliable test documentation process.

The VC test stand control system was specially developed for fatigue tests in the field of bike safety and offers, together with a pneumatic test stand, a reliable servo-pneumatic testing system. VELO CONTROL possesses a number of important system advantages:

  • Accurate measurements: Every single testing load is accurately recorded using calibrated load cells (which meet industrial standard) – a fundamental requirement for a reliable testing method.
  • Control system: Specially developed regulation units ensure that the testing loads’ target values are maintained. Any deviation due to technical faults or other factors are automatically regulated and corrected.
  • Monitoring: With the help of numerous sensors the PC monitors the test stand and switches itself off if e.g. a component fractures.
  • Documentation: The system supplies an automatic documentation of the test sample, the testing conditions, and the results achieved in accordance with ISO 9000.
  • User-frindly operation: The graphical user interface (WINDOWS) is extremely user-friendly. Already after a short training period the testing can be carried out by employees with no specialist PC knowledge.
  • Flexibility: Users may choose between pre-set EN, ISO, EFBe, or factory standards. They can also set the parameters according to their own test specifications.
  • Programme control: Users can combine various tests in one programme process, which will then run automatically. They are then able to e.g. run multiple stage tests.
  • Modular system: VELO CONTROL works together with all EFBe frame fatigue test stands.
  • Dual operation: A 2 cylinder and a 1 cylinder test stand, or two 1 cylinder test stands can be operated simultaneously by one PC.
  • Velocity: The velocity depends on the magnitude of the testing loads applied during testing, as well as on the rigidity of the components. It usually lies between 2 and 5 Hz.
DYNR fatigue test stand for frames - 2 cylinder
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The slightly tilted angle of load input and correct supporting points holding the test sample, enable an accurate and realistic simulation of the out-of-saddle loads present when the bike is in operation. This test set-up was adopted by the bicycle safety standard DIN 79100 and the European bicycle safety standards. Additional modules for the loading cases specified as rider load (DYNRFS) and jump (DYNRG) are also available.
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DYNG fatigue test stand for front forks - 1 cylinder
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The front fork is supported similarly to that of the head tube. The relevant loads, which cause bending are simulated vertically to the head tube by pneumatically produced tension and compression. All standard front fork units are supported. A module DYNGS for testing of disk brake forks according to EN 14764, 14766 or 14781  is also available.
DYNFG fatigue test stand for suspension forks - 1 cylinder
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The standards for suspension forks often demand a test at full extension. In operation, however, the relevant fatigue loads are measured when the fork is (partially) compressed. The test stand enables the fork to be compressed to a determined percentage during the test, making it more realistic than tests measuring loads at full extension and therefore important for all lightweight constructions. It also allows for a fair comparison to rigid forks.
DYNLV fatigue test stand for handlebars and stems - 1 cylinder
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Handlebars/stem units are fixed similar to the conditions present in standard operation. The test consists of two parts: First, the testing loads are conducted in the same direction (in phase) into both ends of the handlebars. This represents the stresses and strains exerted on the handlebars by uneven road surfaces. Next, an antiphase test is carried out analogue to the conditions produced by riding out-of-saddle. A mechanical synchronisation guarantees that the maximum load is evenly exerted on both sides of the handlebars, even at higher test velocities.
DYNS fatigue test stand for seat post – 1 cylinder
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The seat post is fixed similar to the conditions present in standard operation. The standard seat post angles are 67, 70 and 73 degrees. All standard seat post diameters can be assembled. A Two-cylinder module DYNSISO for tests according to ISO 4210 and EN 14781  is also available.

DYNA fatigue test stand for cranksets and axles - 2 cylinder
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 EN and ISO test set-ups do not result in a satisfactory comparison to crankset and axle fracture images in reality. For this reason, the testing loads on this particular test stand can, according to the EFBe set-up, also be conducted from a lateral angle into the pedal position.
Last Update: 21.02.2011,16:58