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Metals 2016, 6(7), 163; doi:10.3390/met6070163

Failure Analysis of High Strength Galvanized Bolts Used in Steel Towers

1
LADICIM (Laboratory of Materials Science and Engineering), University of Cantabria, ETS. Ingenieros de Caminos, Av/Los Castros 44, Santander 39005, Spain
2
Inesco Ingenieros, CDTUC módulo 9, Av/Los Castros 44, Santander 39005, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 26 May 2016 / Revised: 28 June 2016 / Accepted: 7 July 2016 / Published: 13 July 2016
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Abstract

This paper analyses the failure of three bolts used in the structural connections of a number of steel towers located in northern Europe. The analysis comprises optical and scanning electron microscopy, microstructural and hardness analysis, mechanical testing and structural integrity assessments. The three bolts present very similar failure processes, with a circumferential external crack that led to the final failure. The morphology of the crack propagation is typical of Hydrogen-Induced Stress Corrosion Cracking (HISCC), with mixed intergranular-transgranular micromechanisms, tearing processes and secondary cracking. The cracks then grew subcritically until they reached their critical size. Quench cracking or fatigue processes have been ruled out. View Full-Text
Keywords: bolt; crack; hydrogen induced cracking; FAD bolt; crack; hydrogen induced cracking; FAD
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Álvarez, J.A.; Lacalle, R.; Arroyo, B.; Cicero, S.; Gutiérrez-Solana, F. Failure Analysis of High Strength Galvanized Bolts Used in Steel Towers. Metals 2016, 6, 163.

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