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Circumventing Practical Difficulties in Determination of Threshold Stress Intensity for Stress Corrosion Cracking of Narrow Regions of Welded Structures

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Abstract

Determination of the threshold stress intensity for stress corrosion cracking (K Iscc) of narrow areas such as weld and heat-affected zone (HAZ) of a weldment is a nontrivial task because of the requirements of large specimens in testing by the traditional techniques and the difficulty of restricting crack propagation to narrow regions in such specimens. This article describes a successful application of the circumferential notch tensile (CNT) technique to determine the K Iscc of narrow regions of the weld and HAZ. Also, the microstructure of the HAZ of the manual metal arc-welded steel was simulated over a relatively small length of specimens and its K Iscc in a hot caustic solution was determined successfully. Intergranular stress corrosion cracking was confirmed with a scanning electron microscope.

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Abbreviations

a :

effective crack length (m)

a 0 :

initial crack length (m)

a f :

fatigue crack depth (m)

a m :

machine notch depth (m)

\( \bar{a} \) :

crack length calculated by taking Irwin correction factor into account

a crit :

critical depth of crack (m)

d :

equivalent diameter of final ligament area (m)

D :

specimen outside diameter (m)

F :

geometrical function depending on the fatigue crack depth and diameter of the specimen

F o :

geometrical function depending on the fatigue crack depth, diameter of specimen and equivalent ligament diameter

K I :

stress intensity factor (MPa m1/2)

K Ic :

critical stress intensity factor or fracture toughness (MPa m1/2)

K Iscc :

threshold stress intensity factor for stress corrosion cracking (MPa m1/2)

P :

applied tensile force (N)

r y :

Irwin correction factor (m)

t :

time (h)

t f :

time to failure (h)

α :

geometrical factor depending upon fatigue crack depth and diameter

ε :

eccentricity (m)

σ N :

nominal applied stress (Pa)

σ y :

0.2 pct offset tensile yield stress (Pa)

σ t :

tensile stress applied to the specimen (Pa)

σ b :

bending stress induced by the eccentricity of the ligament (Pa)

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Acknowledgments

The authors thank Australian Research Council (ARC) for their support with a Linkage Project grant (LP0454226). They also thank Prof. Elena Pereloma, University of Wollongong, for her kind help with providing access to the simulation facility.

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Author notes

  1. Sarvesh Pal (formerly Ph.D. Student, Postdoctoral Fellow) & R. Rihan (formerly Ph.D. Student)

    Present address: School of Mechanical and Mining Engineering, University of Queensland, Brisbane, QLD, 4072, Australia

Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC, 3800, Australia

    Sarvesh Pal (formerly Ph.D. Student, Postdoctoral Fellow), R. K. Singh Raman (Professor) & R. Rihan (formerly Ph.D. Student)

  2. Department of Chemical Engineering, Monash University, Clayton, VIC, Australia

    R. K. Singh Raman (Professor)

  3. Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    R. Rihan (formerly Ph.D. Student)

Authors
  1. Sarvesh Pal
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  2. R. K. Singh Raman
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  3. R. Rihan
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Correspondence to R. K. Singh Raman.

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Manuscript submitted April 20, 2011.

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Pal, S., Singh Raman, R.K. & Rihan, R. Circumventing Practical Difficulties in Determination of Threshold Stress Intensity for Stress Corrosion Cracking of Narrow Regions of Welded Structures. Metall Mater Trans A 43, 3202–3214 (2012). https://doi.org/10.1007/s11661-012-1119-3

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