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What is the main difference between corrosion fatigue fracture and stress corrosion fracture of geological grooved drill pipe?
Release time:
2019-06-10
Author:
Source:
Shandong Yikuang Science and Technology Drill Pipe, Spiral Drill Pipe, Geological Drill Pipe-Sales Hotline: 13508920928,0635-2311078
1initiation and propagation of cracks: Both stress corrosion cracks and corrosion fatigue cracks start on the surface of the material. Under the condition of strong corrosive medium and large stress.Stress corrosion cracking can occur even from smooth surfaces(Of course, it will also be generated at the stress concentration.)The corrosion initiation fatigue crack originates from the stress concentration without exception.
2Relationship between subcritical crack propagation rate and stress index factor and frequency: Corrosion fatigue crack growth rate is affected by frequency..But in most cases it is the stress intensity factor that controls it. Stress corrosion cracking is different and is mainly time-controlled.
Shandong Yikuang Science and Technology Drill Pipe, Spiral Drill Pipe, Geological Drill Pipe-Sales Hotline: 13508920928,0635-2311078
3. Fracture morphology:The strange rate of expansion of stress corrosion cracking cracks is usually rougher than the corrosion fatigue fracture, and there is no shell filling pattern of corrosion fatigue.
Key words:
Geological drill pipe, drill pipe, spiral drill pipe
