Fatigue Fracture Surface
A fatigue fracture surface is characterized by Fatigue Striations and a final fracture area. It is important for failure analysis of components under cyclic loading.
Physical-Chemical Mechanism of Action
The fatigue fracture surface forms due to repeated stress applications, which activate microscopic grain splits and deformations in the material. These splits accumulate into Fatigue Striations that extend across the fracture site.
Metallurgical Relevance & Risks in Welding
Fatigue fractures can occur in weld areas when the material is subjected to cyclic loading. They lead to component failure and can be difficult to detect because they do not provide clear visual indicators like hot cracks or solidification cracks.
Workshop Practice & Action Instructions
To prevent fatigue fractures, it is important to choose the correct material and minimize loading. The weld must ensure adequate hardness and toughness. In suspected cases, special testing methods like radiography or ultrasound should be used to detect the fatigue fracture surface.