Red Seal Carpenter Practice Exam 2025 – All-in-One Resource to Master Your Certification!

Fastener fatigue refers to the weakening of a fastener over time as a result of repeated cycles of loading and unloading, which can occur in various applications where fasteners are subjected to dynamic forces. Every time a load is applied to a joint, it generates stress in the fastener. When this loading is cyclical—such as in structural applications or machinery where components expand, contract, or vibrate—microscopic cracks can develop over time. These cracks can grow each time the load is reapplied, eventually leading to complete failure of the fastener if it is not monitored or replaced.

Understanding this concept is crucial in construction and mechanical fields to ensure the longevity and safety of structures, as well as in maintaining the integrity of assemblies that rely on the strength of fasteners. It highlights the importance of selecting appropriate fasteners for specific load conditions and monitoring them for signs of wear.