Analyse der Einflüsse auf die Rissbildung infolge Flüssigmetallversprödung beim Feuerverzinken

Feldmann, Markus; Pinger, Thomas; Tschickardt, Dirk; Bleck, Wolfgang; Völling, Alexander; Langenberg, Peter

doi:10.1002/stab.200810007

Cited by 16 publications

(5 citation statements)

References 11 publications

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“…High-temperature strain gauges could not be used during hot-dip galvanizing, as they are very susceptible to the extreme conditions in the zinc bath and thus impracticable and uneconomical. The "disturbed" measured strains in the temperature range of about 260 °C to 420 °C can be attributed to the effects of melting, first of the alloy elements at 231 -327 °C and finally the zinc at 419 °C [13]. 6).…”

Section: Validation Of the Numerical Modelmentioning

confidence: 98%

“…Therefore, the temperature distribution inside the web and the strains at one dowel were measured during the galvanizing process of four 7 m long beams with dowel strips. The heat transfer coefficient is changing during dipping into and abidance in the zinc bath, caused by temperature dependent phase changes of the zinc alloy (from liquid to solid to liquid) [13]. A construction was developed which | 4240 allowed strain measurements by transducers outside the zinc bath (see Fig.…”

Section: Validation Of the Numerical Modelmentioning

confidence: 99%

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Hot‐dip galvanized composite dowel strips

2016

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Comprehensive research during the last years showed that hot-dip galvanizing of steel members in bridge structures allows significant economic and ecological advantages. It could be demonstrated that the first corrosion protection can last over a bridge's lifetime of 100 years, even in an environment with a high corrosivity, so that no major maintenance measures of the corrosion protection are necessary. Parallel to this research, another innovative solution to increase the efficiency of composite bridges has been developed. Starting with several research projects and a first application in 2003, composite dowel strips offer a very economical solution for shear connections between steel girder and concrete slab in composite bridge constructions. Continuous improvement and further development finally led to a general technical approval by DIBt in Germany. Many bridges containing this new technology are built since then, not only in Germany. However hot-dip galvanizing may not be applied to bridges with composite dowel strips as the effects of the hot-dip galvanizing on the fatigue resistance of flame cut composite dowel strips are unknown. Therefore, the necessary fatigue check according to EC 3-1-9 [2] can currently not be carried out properly. A new research project was launched by the Institutes of Steel Construction of RWTH Aachen University and TU Dortmund University [4], with the aim to analyse the fatigue behaviour of hotdip galvanized composite dowel strips. Furthermore a simplified evidence of absence of cracks according to DASt-Guideline 022 [5] shall be performable by defining a detail class for composite dowel strips. The research work includes extensive experimental and numerical studies on the influences during hot-dip galvanizing and on the fatigue behaviour of galvanized dowel strips. First results of these studies will be presented in this paper as well as the experiences of a first bridge project with hot-dip galvanized composite dowel strips in Germany.

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Section: Validation Of the Numerical Modelmentioning

confidence: 98%

Section: Validation Of the Numerical Modelmentioning

confidence: 99%

Hot‐dip galvanized composite dowel strips

2016

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“…Die Ursachen, aus denen die auftretenden Dehnungen e E (t,T) und Dehnbarkeiten e R (t,T) entstammen, sind bestimmbar [5], [6], [9], siehe Bilder 2 und 3.…”

Section: Dehnbarkeitsentwicklung E E R (T T)unclassified

“…Hierzu wird eine in den plastischen Bereich hinein belastete Baustahlprobe betrachtet, z. B. die LNT-(Long Notched Tension)-Probe, die von flüssiger Zinkschmelze umgeben ist [5], [6], [8].…”

Section: Durch Flüssigmetallversprödung Beeinflusste Dehnbarkeit Des unclassified

Die neue DASt‐Richtlinie zur Vermeidung von Rissbildung beim Feuerverzinken

Feldmann

Pinger²,

Sedlacek

et al. 2008

Stahlbau

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Über gehäufte Risserscheinungen an feuerverzinkten Stahlkonstruktionen einhergehend mit Standsicherheitsproblemen ist in letzter Zeit mehrfach berichtet worden [1] bis [6]. Ein mit zahlreichen Vertretern der betroffenen Industriekreise, der Behörden und der Universitäten sowie Beobachtern aus England und Italien und einem Berater aus Österreich besetzter Unterausschuss “DASt‐Richtlinie Rissfreies Verzinken” wurde deswegen gegründet, in dem eine Technische Regel erarbeitet wird, die die Vermeidung von Rissbildung beim Feuerverzinken von den vielfältigen Ursachen her angeht und die Einzelbeiträge quantitativ in den Zusammenhang eines Grenzzustands der Rissbildung bringt. So werden Zulässigkeitsgrenzen für Stahlbau und Verzinkung angeboten mit der gleichzeitigen Möglichkeit, auch zukünftige Neuentwicklungen zu berücksichtigen. Zusammen mit wesentlichen Ergänzungen zur Überwachung und zu vorhandenen allgemeinen Normen werden Voraussetzungen für das problemlose und weiterhin einfache Feuerverzinken im bauaufsichtlichen Bereich geschaffen. Grundlagen, Ziel und Konzept der neuen DASt‐Richtlinie werden im Folgenden vorgestellt.

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“…In addition to this, the zinc coating is the anode if the coating has a local defect. Despite the great experience with the procedure of hot dip galvanizing in the past years many damages in hot dipped steel constructions were observed . Cold deformed areas, weldings and special construction details were mostly concerned.…”

Section: Introductionmentioning

confidence: 99%

On the influence of cold deformation on liquid metal embrittlement of a steel in a liquid zinc bath

Luithle

Pohl

2015

Materials & Corrosion

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The influence of cold deformation on liquid metal embrittlement of a steel in a liquid zinc bath was studied. A typical construction steel was cold deformed with different degrees. The microstructure of the different material conditions were investigated as well as their mechanical properties at 450 °C in hot air. Tensile tests with different strain rates were made in a 450 °C hot zinc bath. For each specimen the reduction in area was determined and the fracture surfaces were studied. It can be shown that the strain rate has a large effect on liquid metal embrittlement. An increasing degree of deformation leads to a decrease on liquid metal embrittlement which is caused by the change of microstructure through deformation.

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Analyse der Einflüsse auf die Rissbildung infolge Flüssigmetallversprödung beim Feuerverzinken

Cited by 16 publications

References 11 publications

Hot‐dip galvanized composite dowel strips

Hot‐dip galvanized composite dowel strips

Die neue DASt‐Richtlinie zur Vermeidung von Rissbildung beim Feuerverzinken

On the influence of cold deformation on liquid metal embrittlement of a steel in a liquid zinc bath

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