Determination of global and local cleavage fracture characteristics of high strength bolt steels

Bo Wu; Benedikt Döbereiner; Zhengyin Piao; Björn Sabotke; Victoria Brinnel; Sebastian Münstermann

doi:10.3139/120.111092

Article

Determination of global and local cleavage fracture characteristics of high strength bolt steels

Bo Wu , Benedikt Döbereiner , Zhengyin Piao , Björn Sabotke , Victoria Brinnel and Sebastian Münstermann

Published/Copyright: November 21, 2017

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From the journal Materials Testing Volume 59 Issue 11-12

Abstract

High strength bolts with large diameters are widely used in steel structures from the infrastructure and energy conversion sectors. The brittle fracture behavior of these connections has to be taken into account, especially for structures operating at cold environment, such as the offshore wind energy plant. Generally, two groups of methods are employed for cleavage fracture assessment, i. e., global approaches developed in the fracture mechanics frame and local criteria based on the damage mechanics approach proposed by Beremin. This work aims to determine characteristics of high strength bolt steels in the strength class 10.9 for cleavage fracture assessment. Fracture mechanics tests are conducted to determine the experimental master curves. In addition, numerical approaches are employed to derive the parameters of Beremin model from the master curves.

Kurzfassung

Hochfeste Schrauben mit großen Abmessungen werden oftmals in Stahlkonstruktionen wie Windenergieanlagen verwendet. Aufgrund der möglichen niedrigen Einsatztemperaturen innerhalb dieser Stahlkonstruktionen muss das Sprödbruchverhalten der Schrauben berücksichtigt werden. Grundsätzlich werden zwei Arten von Ansätzen zur Spaltbruchbeurteilung eingesetzt: zum einen der globale Ansatz, welcher im Rahmen der Bruchmechanik entwickelt wurde, sowie zum anderen der lokale Ansatz, welcher auf dem schädigungsmechanischen Modell nach Beremin basiert. Das Ziel dieser Arbeit ist die Bestimmung der experimentellen Kennwerte von hochfesten Schraubenstählen der Festigkeitsklasse 10.9 zur Spaltbruchbeurteilung. Die bruchmechanischen Versuche werden zur Ermittlung der experimentellen Masterkurven durchgeführt. Zusätzlich werden durch die Nutzung dieser ermittelten Masterkurven die Parameter des Beremin-Modells mittels eines numerischen Ansatzes kalibriert.

*Correspondence Address, Dr.-Ing. Bo Wu, Integrity of Materials and Structures, Steel Institute, RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany, E-mail: bo.wu@rwth-aachen.de

Dr.-Ing. Bo Wu, born in 1985, studied Metal Forming Technology at University of Science and Technology Beijing, China from 2004 to 2008 and Metallurgical Engineering at RWTH Aachen University, Germany from 2008 to 2011. Since then, he has been working as a scientific researcher at the Steel Institute of RWTH Aachen University and received his PhD degree in 2016.

Benedikt Döbereiner, born in 1985, studied Materials Engineering at RWTH Aachen University, Germany from 2008 to 2010. He worked as a scientific researcher at the Steel Institute of RWTH Aachen University from 2010 to 2016. Now, he is working as a project engineer at IWT Solution AG in Aachen.

Zhengyin Piao, born in 1991, studied Metallurgical Engineering at University of Science and Technology Beijing, China from 2010 to 2014. Since 2014, he has been studying Metallurgical Engineering at RWTH Aachen University, Germany and has been working as a student research assistant at the Steel Institute of RWTH Aachen University.

Björn Sabotke, is studying Materials Engineering at RWTH Aachen University, Germany. Now, he is working on his Master thesis at the Steel Institute of RWTH Aachen University.

Victoria Brinnel, born in 1986, studied Aerospace Engineering at the University of Stuttgart, Germany from 2005 to 2011. Since 2011, she is a scientific researcher at the Steel Institute (IEHK) of RWTH Aachen University, Germany. Since 2016, she is a group leader for structural integrity in the newly founded unit for Integrity of Materials and Structures at the Steel Institute.

Prof. Dr.-Ing. Sebastian Münstermann, born in 1977, studied Civil Engineering at RWTH Aachen University, Germany from 1995 to 2001. Then, he worked as a scientific assistant at the Steel Institute of RWTH Aachen University and received his PhD degree in 2006. He was group leader for materials mechanics at the Steel Institute of RWTH Aachen University from 2006 to 2014. From 2014 to 2016, he worked as a senior scientist at the Institute for Energy and Climate Research at the Research Center Jülich, Germany. Since 2016, he is Professor for the newly founded unit for Integrity of Materials and Structures at the Steel Institute.

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Published Online: 2017-11-21

Published in Print: 2017-11-15

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https://doi.org/10.3139/120.111092