Fatigue

Definition

Fatigue is a structural failure that occurs as a result of a load being applied and removed, or reversed, repeatedly over a long period of time or a large number of cycles.

Purpose

Understanding fatigue is essential for designing structures and components that can withstand repetitive stress without failure. This knowledge helps in selecting appropriate materials and designing for durability and longevity in various applications.

Examples of Use

• Aerospace Engineering: Designing aircraft components to withstand repeated stress from takeoffs and landings.
• Mechanical Engineering: Ensuring machinery parts can endure cyclic loads without breaking.
• Civil Engineering: Building bridges and other structures to resist fatigue from traffic loads and environmental conditions.

Related Terms

• Cyclic Loading: Repeated application and removal of a load on a structure.
• Stress Fracture: Cracks or breaks in a material caused by repeated stress.
• Material Fatigue: The weakening of a material due to repeated loading cycles.

Notes

• Fatigue testing is crucial in the design phase to predict the lifespan of materials and components.
• Factors such as material properties, load magnitude, and environmental conditions affect fatigue performance.