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Threshold Stress Intensity Factor

The crack propagation threshold is the minimum stress level at which an existing crack continues to grow under cyclic loading. It is crucial for the safety of infinite-life structures.

Physicochemical Mechanism of Action

The threshold for crack propagation indicates when a crack will grow under constant stress. This value depends on material properties such as hardness and elasticity.

Metallurgical Relevance & Risks in Welding

A threshold that is too low can lead to faster crack propagation, which shortens the service life of components. At overcritical stresses, this can cause sudden fractures and safety issues.

Workshop Practice & Action Instructions

To respect the threshold, stresses in the weld must be kept under control. This requires careful selection of materials and welding processes, as well as proper cooling.

MetallurgieSchweißtechnik

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