Final Overload Rupture
Final fracture is the remaining cross-section of the part that suddenly fails under static overload. The fracture surface shows a heavily deformed appearance.
Physical-Chemical Mechanism of Action
The residual fracture occurs due to continuous fatigue cracks that propagate slowly. Under static overload, a critical point is reached where the remaining cross-section suddenly collapses. This process is also called 'sudden fracture' or 'fast brittle residual fracture'.
Metallurgical Relevance & Risks in Welding
Residual fractures can occur in welded components, especially when the material is under high stress levels and long-term loading. The fracture surface usually shows a roughly deformed surface with sudden deformations. This can lead to safety issues as the component unexpectedly collapses.
Workshop Practice & Action Instructions
To avoid residual fractures, it is important to use the material under optimal stress levels and loading rates. When welding, ensure high mechanical properties and low susceptibility to fatigue. Monitor the component's loading regularly and carry out predictions if needed to detect potential residual fractures early.