Fatigue Limit (S-N Curve)
Endurance limit is the maximum stress that a material can withstand under alternating loads without breaking. It depends on the number of cycles and the stress amplitude.
Physical-Chemical Mechanism of Action
The endurance limit describes the resistance of a material to alternating loads. With each stress fluctuation, microscopic damage occurs, which accumulates over time and can lead to a crack.
Metallurgical Relevance & Risks During Welding
A material with a low endurance limit can fail suddenly under frequent loads or high stress fluctuations. This poses safety risks and increases maintenance costs.
Workshop Practice & Instructions
To improve the endurance limit, choose materials with high fatigue strength and avoid overcritical stresses. During welding, the hardness and microstructure must be carefully controlled. Use suitable welding processes and parameters to create a homogeneous seam.