Fatigue Testing Methods

Fatigue Testing Methods

1. Rotating-Bending Fatigue Test

   • A rotating specimen is subjected to bending stress.

   • Commonly used to determine the endurance limit of materials.

2. Axial Fatigue Test

   • Alternating tensile and compressive loads are applied along the specimen's axis.

   • Used for fatigue life prediction of structural materials.

3. Torsional Fatigue Test

   • A specimen undergoes cyclic twisting.

   • Useful for shafts, gears, and other rotating components.

4. Four-Point Bending Fatigue Test

   • Used for beams and large structural components.

   • Ensures accurate stress distribution analysis.

Fatigue Life and Endurance Limit

• Fatigue Life (Nf): The number of cycles a material can endure before failure at a given stress level.

• Endurance Limit (Se): The maximum stress amplitude a material can withstand indefinitely without failing.