Stress Intensity Range
Stress intensity range is the difference between maximum and minimum stress in a load cycle. It influences the propagation rate of fatigue cracks.
Physicochemical Mechanism of Action
The stress intensity range (SIR) is the difference between the maximum and minimum stress value that occurs in one load cycle. These stress swings can start microscopic cracks, especially when they repeat.
Metallurgical Relevance & Welding Risks
A wide stress intensity range can speed up fatigue crack growth. That shortens part life and raises the risk of breaking under load. When welding, it is especially important to keep the stress intensity range small so the weld keeps its strength and hardness.
Workshop Practice & Instructions
To cut the stress intensity range, watch out for even load distribution and avoid fast stress swings. When picking the welding process, go for methods with low mechanical loading, like laser welding or electron beam welding. Make sure the workpieces are held solid and stable before welding to keep stresses low.