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Study of fatigue crack initiation in the vicinity of notches

✍ Scribed by K. Saanouni; C. Bathias

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
788 KB
Volume
16
Category
Article
ISSN
0013-7944

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✦ Synopsis

Using the crack initiation measurements for notched specimens with various geometry (CT and axisymetric notched specimens) and different notch radii, we will try to determine the number of cycles to initiate a fatigue crack in the vicinity of stress concentration.

NOMENCLATURE

nominal stress amplitude stress intensitv factor amplitude (mode I) stress and total strain at ihe tip of the notch applied load amplitude theoretical elastic stress concentration factor fatigue notch factor yield stress Young's modulus number of cycles to initiation plastic zone size notch root radius CT specimen width CT sbecimen thick notch depth outside diameter notched section diameter for axisymetric specimen

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Fatigue tests have been carried out on edge notched mild steel specimens of various thicknesses. Results are presented showing the effect of thickness on crack initiation, crack growth and the geometry and fractography of the fracture surface. It was found that both crack initiation and crack growth