Threshold Stress Intensity Range
The crack propagation threshold is the minimum stress intensity factor at which existing cracks in a material grow macroscopically. It determines the boundary between static and dynamic crack behavior.
Physicochemical Mechanism of Action
The threshold value of crack propagation (SFR) is a critical stress intensity factor below which cracks in a material do not grow further. It depends on properties such as material structure and loading conditions.
Metallurgical Relevance & Welding Risks
A too low SFR can lead to macroscopic crack growth, especially under increasing stresses or high loads. This increases the risk of cracking and hot cracking in the weld.
Workshop Practice & Action Instructions
To protect the SFR, it is important to keep the maximum stress during welding as low as possible. This can be achieved through optimized welding parameters and careful material selection. For highly stressed applications, additional inspections and crack checks should be performed.