Lecture Video on Fracture Mechanism 2 | Metallurgy | SNS Institutions

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Crack initiation is the first stage of fracture. It usually begins at stress concentrators such as surface scratches, voids, inclusions, grain boundaries, or sharp notches. Repeated loading, corrosion, or manufacturing defects can accelerate crack initiation. At the microscopic level, dislocation movement and local plastic deformation cause microcracks to form. In brittle materials, crack initiation requires little plastic deformation, whereas in ductile materials, significant plastic flow occurs before cracks develop.

Видео Lecture Video on Fracture Mechanism 2 | Metallurgy | SNS Institutions канала Karthick Jayashelan