Fatigue & Fracture of Engineering Materials & Structures

ORIGINAL CONTRIBUTION

Analysis of fatigue crack growth behavior of SS 316(N) welds using the unified approach

Corresponding Author

M. Nani Babu

[email protected]

orcid.org/0000-0001-5068-2837

Materials Development and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, 603102 India

Correspondence

M. Nani Babu, Materials Development and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, India 603102.

Email: [email protected]

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G. Sasikala,

G. Sasikala

Materials Development and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, 603102 India

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K. Sadananda,

K. Sadananda

Technical Data Analysis Inc., 3190 Fairview Park, Falls Church, VA, 22043 USA

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M. Nani Babu,

Corresponding Author

M. Nani Babu

[email protected]

orcid.org/0000-0001-5068-2837

Materials Development and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, 603102 India

Correspondence

M. Nani Babu, Materials Development and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, India 603102.

Email: [email protected]

Search for more papers by this author

G. Sasikala,

G. Sasikala

Materials Development and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, 603102 India

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K. Sadananda,

K. Sadananda

Technical Data Analysis Inc., 3190 Fairview Park, Falls Church, VA, 22043 USA

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First published: 21 October 2019

https://doi.org/10.1111/ffe.13137

Citations: 2

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Abstract

Fatigue crack growth (FCG) behavior of SS 316(N) weld has been evaluated at different R-ratios at room temperature and compared with that of the base metal. The FCG resistance of weld is better than that of the base material and is due to the residual stresses developed during the welding. The data were analyzed using the unified approach that considers the two-parametric (ΔK and K_max) nature of fatigue. The R-ratio effects in both the base and weld metals are accounted for without invoking the extrinsic parameters, such as plasticity-induced crack closure. Since the residual stresses are of the monotonic type, they affect the crack growth via the K_max-parameter. The crack growth trajectory plots were developed, and they show how the two crack tip driving forces, ΔK and K_max, change to overcome the FCG resistance of the weld in relation to that of the base metal. The results also show that the effects from the compressive residual stresses are more dominant at low R-values and occur via the K_max parameter.

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Volume43, Issue3

March 2020

Pages 527-538

Analysis of fatigue crack growth behavior of SS 316(N) welds using the unified approach

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Analysis of fatigue crack growth behavior of SS 316(N) welds using the unified approach

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