Reasons for Cracking of Truck Wheel Rims

Here are the revised reasons for truck rim cracking, with more natural English expressions:

1. Impact or collision: The rim may crack due to severe impact when the vehicle runs over hard objects, hits deep potholes, is struck by sharp objects at high speed, or is involved in a traffic accident.

2. Quality issues: If the rim material fails to meet standards, or there are casting defects such as air bubbles during manufacturing, its structural strength will be reduced, making it prone to cracking.

3. Fatigue fracture: Under harsh driving conditions—such as long-term high-speed driving, frequent sudden acceleration, and abrupt braking—the rim may develop cracks due to material fatigue over time.

4. Overloading: Exceeding the rim's weight-bearing capacity increases its structural stress, which can easily lead to cracking or even rupture.

5. Overheating: Prolonged driving in high-temperature environments can cause the rim's internal temperature to rise significantly, deteriorating the material properties and potentially resulting in cracks.

6. Excessive or insufficient tire pressure: Both over-inflation and under-inflation of tires can create uneven stress on the rim, which may lead to cracking after prolonged use.