Why should trailer axles undergo fatigue tests?

What is the fatigue test for? Why do trailer axles need fatigue tests? Today, let's walk into the production workshop of DARO Group to take a close look at the work of the fatigue test bench.

When choosing an axle, many owners want to understand the basic situation of the product from all aspects, such as strength, toughness, load-bearing force, service life and so on. However, these data are often just a number or adjectival appearance, many owners feel more boring, after reading, listening to no impression. In contrast, the fatigue test is more intuitive and transparent, and more fully demonstrates the performance of the axle.

Fatigue testing is generally used to test the stress limit of the axle, that is, the maximum stress value after infinite stress cycles without damage, which can also be called the endurance limit.

After the axle is installed on the trailer, it will continue to bear the variable load of the vehicle. If the axle quality is not up to standard, after a period of time, it is easy to form a small crack in the local high stress area, and then gradually expand from the small crack, eventually leading to fracture and affecting driving safety.

The axle fatigue test bench completely simulates the working conditions of the axle, such as when the vehicle is fully loaded, or when the owner is used to various stresses and forces on the axle. Through this repetitive load condition, whether the strength, durability and toughness of the axle can meet the requirements of relevant standards can be determined.

For DARO's regular trailer axles, the number of fatigue tests is typically set to millions of times, lasting about 72 hours. If it is a special vehicle such as a large transport vehicle, the test data will be adjusted according to the operating conditions.

After the fatigue test is completed, the axle will enter the magnetic particle flaw detection workshop to detect whether there are dark lines, cracks and other defects in the shaft body, and only after meeting the requirements of the index can the strength, toughness and durability be considered qualified.

The qualified axle only has the preliminary factory qualification, and the subsequent quality inspection process such as salt spray test should be carried out to further test the corrosion resistance and other performance of the axle. Only the axle with full performance standards can be successfully shipped out of the factory to ensure that it does not have fatigue failure during the service period. Such a trailer axle, the owner of the natural more worry, more assured.

It is also under such strict quality inspection that DARO axle/axle has maintained a record of zero quality disputes in the more than 20 years since entering the market, and has accumulated a large number of loyal customers with reliable quality and realistic prices. The sales network covers the whole country and extends to more than 50 countries and regions such as Australia, America, Europe and Southeast Asia.