Effect of Mixed Mode Loading Induced by Asymmetrical Stress upon Crack Initiation from Corrosion Pits

Narciso Acuña-González; J. González-Sánchez; E. Contreras; Israel Sauceda

doi:10.4028/www.scientific.net/AMR.65.39

Paper Titles

Numerical Simulation of Multiple Scattering by Hidden Cracks under the Incidence of Elastic Waves
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Fatigue Crack Growth in SAW Welded Joints of API 5L Steel Pipe in the Short Radial Direction
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Transferability of the Gurson Damage Model Parameters with Charpy and Tensile Tests with Different Constrain Level
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Mechanics of Randomly Folded Thin Materials
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Effect of Mixed Mode Loading Induced by Asymmetrical Stress upon Crack Initiation from Corrosion Pits
p.39

Evaluation of Brittle Layers Obtained by Boriding on AISI H13 Steels
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Short Crack Propagation Model Applied to Shot Peened Aluminium Alloys
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Effect of Boriding on the Mechanical Properties of AISI 1045 Steel
p.63

Verification of the Ultrasonic Qualification for Structural Integrity of Partially Concrete Embedded Steel Elements
p.69

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Effect of Mixed Mode Loading Induced by Asymmetrical Stress upon Crack Initiation from Corrosion Pits

Abstract:

This work focuses on determining the influence of mixed stress conditions on the initiation of fatigue cracks from corrosion pits in a UNS S31603 stainless steel. Fatigue limit was established as a threshold stress criteria for fatigue crack initiation from semi-elliptic surface pits. The strain energy release rate range (G) around semi-elliptic surface pits was determined as a function of the pit aspect ratio (depth/major width axes: a/c), pit contour and the orientation of the nominal stress from a linear elastic fracture mechanics approach. Results indicated that stress conditions for crack initiation in mixed mode overcome the minimum stress level or single threshold stress established from the fatigue limit concept. Under mixed mode condition a crack will grow at the surface zone (φ = 0˚) when a/c ≥ 0.60 and for orientation angles from 5˚ to 75.