PSI - Issue 59

Jesús Toribio et al. / Procedia Structural Integrity 59 (2024) 198–205 Jesús Toribio / Procedia Structural Integrity 00 ( 2024) 000 – 000

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4. The hydrostatic stress at the boundary controls the fracture of the sample in the quasi-instantaneous tests , fast enough to avoid hydrogen penetration towards the inner points. In this case the environmental effect is restricted to the notch tip. 5. The triaxiality factor (maximum triaxiality in the sample) governs the fracture in the quasi-static tests , slow enough to allow the stationary solution of the diffusion problem to be reached. In this case the environmental effect depends on the hydrogen diffusion towards the maximum hydrostatic stress points.

Fig. 6. Johann Sebastian Bach with the canon triplex (portrait by Elias Gottlob Haussmann).

Acknowledgements The author wishes 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 Costa, J.E., Thompson, A.W., 1982. Hydrogen Cracking in Nominally Pearlitic 1045 Steel. Metallurgical Transactions 13A, 1315 - 1318. Hirth, J.P., 1980. Effects of Hydrogen on the Properties of Iron and Steel. Metalurgical Transactions 11A, 861-890. Thompson, A.W., Chesnutt, J.C., 1979. Identification of a Fracture Mode: The Tearing Topography Surface. Metallurgical Transactions 10A, 1193 - 1196. Toribio, J., 1997. Fracture Mechanics Approach to Hydrogen Assisted Microdamage in Eutectoid Steel. Metallurgical and Materials Transactions 28A, 191 - 197. Toribio, J., Lancha, A.M., Elices, M., 1991. Characteristics of the New Tearing Topography Surface. Scripta Metallurgica et Materialia 25, 2239 2244. Toribio, J., Lancha, A.M., Elices, M., 1992. The Tearing Topography Surface as the Zone Associated with Hydrogen Embrittlement Processes in Pearlitic Steel. Metallurgical Transactions 23A, 1573 - 1584. Van Leeuwen, H.P., 1974. The Kinetics of Hydrogen Embrittlement: A Quantitative Diffusion Model. Engineering Fracture Mechanics 6, 141-161.