What can be height of an extrusion or an intrusion which is responsible for crack initiation in case of fatigue (in cm?

Material Failure topics include: Failure fundamentals, ductile and brittle fracture, fracture mechanics, fatigue, fracture tests, creep and high temperature alloys. Material failure is a technical term in engineering that describes when a material used in a design no longer performs its intended purpose. It can be caused by a number of factors, including: Stress concentration: When the load on a material is unevenly distributed Corrosion: The gradual degradation of a material's properties due to chemical reactions with its environment Incorrect material selection  Material failure can be... Show more

Material Failure topics include: Failure fundamentals, ductile and brittle fracture, fracture mechanics, fatigue, fracture tests, creep and high temperature alloys.

Material failure is a technical term in engineering that describes when a material used in a design no longer performs its intended purpose. It can be caused by a number of factors, including:
Stress concentration: When the load on a material is unevenly distributed
Corrosion: The gradual degradation of a material's properties due to chemical reactions with its environment
Incorrect material selection 

Material failure can be distinguished into two broad categories:
Microscopic failure: This type of failure is defined in terms of crack initiation and propagation.
Macroscopic failure: Load carrying capacity and energy storage capacity are equivalently defined as macroscopic material failure. 
Experts typically characterize material failures as brittle, ductile, fatigue, embrittlement, or environmentally related failures. 

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