Microstructure-Oriented Fatigue Assessment of Construction Materials and Joints Using Short-Time Load Increase Procedure*

Frank Walther

doi:10.3139/120.110592

Published by De Gruyter September 28, 2014

Microstructure-Oriented Fatigue Assessment of Construction Materials and Joints Using Short-Time Load Increase Procedure*

Mikrostrukturbasierte Bewertung der Ermüdungsfestigkeit von Konstruktionswerkstoffen und Verbindungen mittels Kurzzeit-Laststeigerungsverfahren

Frank Walther

From the journal Materials Testing

https://doi.org/10.3139/120.110592

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Abstract

Stress-strain-hysteresis, change in deformation-induced temperature and change in DC-based electrical resistance measurements are applied for the detailed characterization of structural-mechanical processes in construction materials and joints under multiple-step and single-step fatigue loading. Results concerning the influence of joining technologies on austenitic steel AISI304, carbon-fiber reinforced polymers (CFRP) and beech wood materials, of environmental media on magnesium alloys Mg-4Al-2Ba-2Ca (DieMag422) and Mg-10Gd-1Nd, and of manufacturing processes on titanium alloy Ti-6Al-4V and wood-plastic composites (WPC) are discussed. The load- and cycle-dependent change in microstructure was investigated by light and electron microscopy and correlated with fatigue properties, to reach a preferably precise description of process structure property relationship in a qualitative and quantitative manner. The time-efficient load increase procedure applied for evaluation of joining, environmental and manufacturing influence on fatigue performance is suitable for production-accompanied usage.

Kurzfassung

Zur detaillierten Charakterisierung der unter Ermüdungsbeanspruchung auftretenden strukturmechanischen Prozesse wurden Messungen der Spannungs-Dehnungs-Hysterese, der verformungsinduzierten Temperaturänderung und der elektrischen Widerstandsänderung in mehrstufigen und einstufigen Untersuchungen angewendet. Ergebnisse des Einflusses der Verbindungstechnologie auf austenitischen Stahl X5CrNi18-10, kohlenstofffaserverstärkte Kunststoffe (CFK) und Buchenholzwerkstoffe, des Umgebungsmediums auf die Magnesiumlegierungen Mg-Al4-Ba2-Ca2 (DieMag422) und Mg-Gd10-Nd1 sowie des Herstellungsverfahrens auf die Titanlegierung Ti-Al6-V4 und auf Holz-Kunststoff-Verbundwerkstoffe (WPC) werden hier diskutiert. Die beanspruchungs- und lastspielzahlabhängige Veränderung der Mikrostruktur wurde licht- und elektronenmikroskopisch untersucht und mit den Ermüdungseigenschaften korreliert, um eine möglichst präzise qualitative und quantitative Beschreibung der Prozess-Struktureigenschafts-Beziehung zu erzielen. Das zeiteffiziente Laststeigerungsverfahren ist für den produktionsbegleitenden Einsatz zur Beurteilung von Verbindungstechnologien, Umgebungsmedien und Herstellungsverfahren auf die Ermüdungseigenschaften sehr gut geeignet.

** Correspondence Address, Prof. Dr.-Ing. Frank Walther, Technical University Dortmund, Department of Materials Test Engineering (WPT), Baroper Str. 303, 44227 Dortmund, Germany, E-mail: frank.walther@tu-dortmund.de

Extended Version of the Contribution to the National Conference Werkstoffprüfung 2013

Prof. Dr.-Ing. Frank Walther, born in 1970, studied Mechanical Engineering with specialization in materials science and engineering at TU Kaiserslautern, Germany, from 1992 to 1997 and finished his PhD on the fatigue assessment of highly-loaded ICE wheel steels at Institute of Materials Science and Engineering (WKK) in 2002. From 2002 to 2008 he was group leader of fatigue behaviour at WKK and finished his postdoctoral qualification (habilitation) in materials science and engineering in 2007. After that he joined Schaeffler AG in Herzogenaurach, Germany. Within corporate development he took responsibility for public private partnership concerning public research funding and special projects in materials research. Since December 2010 he has been professor of Materials Test Engineering (WPT) in the Faculty of Mechanical Engineering at TU Dortmund, Germany. His research portfolio includes determination of structure-property-relationships of construction materials and components taking the influence of manufacturing, joining and corrosion processes as well as service loading into account. New measurement and destructive/non-destructive testing techniques are applied for the characterization of fatigue behaviour from LCF to VHCF range under mechanical, thermal, chemical and mixed influences, as well as new physically based approaches for the calculation of damage development and (remaining) fatigue life.

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Published Online: 2014-09-28

Published in Print: 2014-07-15

Microstructure-Oriented Fatigue Assessment of Construction Materials and Joints Using Short-Time Load Increase Procedure*

Abstract

Kurzfassung

References

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