Finite-life fatigue regime
The endurance range in the Wöhler curve shows how long a material lasts under repeated load cycles before it fails by fatigue.
Physical-Chemical Mechanism of Action
The endurance limit range is a zone in the Wöhler curve that describes the fatigue life of a material under repeated load cycles. It shows how often a material can be loaded and unloaded before it becomes capable of fracturing due to micromechanical fatigue.
Metallurgical Relevance & Risks During Welding
For a weld seam, it is important that it stays within the endurance limit range to ensure long-term toughness and hardness. If the load cycles fall outside this range, the seam can fatigue faster and become prone to cracking.
Workshop Practice & Instructions
To ensure that the weld seam remains in the endurance limit range, the following measures should be taken:
• Use suitable welding methods and materials optimized for the specific load case.
• Ensure that the weld seam is correctly shaped and strong enough to withstand the load cycles.
• Monitor the service life of the weld seam through periodic inspections and carry out necessary repairs or replacement.