Bearing Failure Mechanism (2)
Source: China Bearing Network | Time: 2013-02-12
3. Cracking Failure Cracking failure in bearings is often caused by inherent defects or overload conditions. When the applied load exceeds the material's strength limit, it results in what is known as overload cracking. This can occur due to sudden malfunctions of the host equipment or improper installation. Additionally, micro-cracks, shrinkage, air bubbles, large foreign particles, overheating, and localized burns during the manufacturing process can lead to cracking under impact loads or severe vibrations. This type of failure is referred to as fault cracking. It should be noted that during production, inspection, casting, heat treatment, and machining, such defects can be identified through proper instrumentation. However, in most cases, the cracking failures observed in bearings are primarily due to overload conditions. Therefore, stricter quality control measures must be implemented throughout the production and inspection processes. 4. Clearance Change Failure During operation, bearing clearance can change due to external or internal factors, leading to reduced precision or even "seizing" — a condition known as clearance change failure. External factors such as excessive interference fit, misalignment, thermal expansion, or instantaneous overloads can contribute to this issue. Internally, unstable residual austenite or residual stresses can also cause clearance changes, ultimately leading to failure. Monitoring and controlling these factors is essential to ensure the long-term performance and reliability of bearings.
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