PSI - Issue 59

Jesús Toribio et al. / Procedia Structural Integrity 59 (2024) 145–150 Jesús Toribio / Procedia Structural Integrity 00 (2024) 000 – 000

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5

6. Conclusions Results show how the boundary value of hydrogen concentration increases clearly with the remote stress (externally applied load) and slightly decreases with the notch depth, i.e., the equilibrium boundary value of hydrogen concentration is slightly higher for shallow notches (both sharp and blunt). The point of maximum hydrostatic stress shifts by increasing the load from the notch tip to the axis of the bar.

5.0

5.0

C/D=0.1 C/D=0.2 C/D=0.3 C/D=0.4

C/D=0.1 C/D=0.2 C/D=0.3 C/D=0.4

4.0

R/D=0.40

4.0

R/D=0.04

3.0

3.0

2.0

2.0

S (mm)

S (mm)

x

x

1.0

1.0

0.0

0.0

0.0 0.2 0.4 0.6 0.8 1.0

0.0 0.2 0.4 0.6 0.8 1.0

F/F

F/F

max

max

(a) (b) Fig. 4. Depth x S of the maximum hydrostatic stress point for sharp notches (R/D = 0.04; left) and blunt notches (R/D = 0.40; right). Acknowledgements The authors wish to kindly and sincerely acknowledge the continuous and long-standing financial support to his scientific research in the field of fracture & structural integrity provided by the following Spanish Institutions: Ministry for Science and Technology (MICYT; Grant MAT2002-01831), Ministry for Education and Science (MEC; Grant BIA2005-08965), Ministry for Science and Innovation (MICINN; Grant BIA2008-06810), Ministry for Economy and Competitiveness (MINECO; Grant BIA2011- 27870) and Junta de Castilla y León (JCyL; Grants SA067A05, SA111A07, SA039A08 and SA132G18). In addition, acknowledgement is given to two companies: E MESA T REFILERÍA (La Coruña. Spain) and T REFILERÍAS Q UIJANO (Los Corrales de Buelna, Santander, Spain) for providing the pearlitic steel wires. References Ayas, C, Deshpande, VS., Fleck, NA., 2014. A Fracture Criterion for the Notch Strength of High Strength Steels in the Presence of Hydrogen. Journal of the Mechanics and Physics of Solids 63, 80-93. Lillard, RS., Enos, DG., Scully, JR., 2000. Calcium Hydroxide as a Promoter of Hydrogen Absorption in 99.5% Fe and a Fully Pearlitic 0.8% C Steel During Electrochemical Reduction of Water. Corrosion 56, 1119-1132. Toribio, J., 1992. Fractographic Evidence of Hydrogen Transport by Diffusion in Pearlitic Steel. Journal of Materials Science Letters 11, 1151-1153. Toribio, J., 1993. Role of Hydrostatic Stress in Hydrogen Diffusion in Pearlitic Steel. Journal of Materials Science 28, 2289-2298. Toribio, J., 1996. Hydrogen-Plasticity Interactions in Pearlitic Steel: A Fractographic and Numerical Study. Materials Science and Engineering A219, 180-191. Toribio, J., 1997. Fracture Mechanics Approach to Hydrogen Assisted Microdamage in Eutectoid Steel. Metallurgical and Materials Transactions 28A, 191 - 197. Toribio, J., 2012. Time-Dependent Triaxiality Effects on Hydrogen-Assisted Micro-Damage Evolution in Pearlitic Steel. ISIJ International 52, 228-233. Toribio, J., 2018. HELP versus HEDE in Progressively Cold-Drawn Pearlitic Steels: Between Donatello and Michelangelo . Engineering Failure Analysis 94, 157-164.