Testing of pipe sections

Anatolii Andreiev; Oleksandr Golovko; Iaroslav Frolov; Florian Nürnberger; Lars Oliver Wolf; Mirko Schaper; Olexandr Grydin

doi:10.3139/120.110759

Article

Testing of pipe sections

Anatolii Andreiev , Oleksandr Golovko , Iaroslav Frolov , Florian Nürnberger , Lars Oliver Wolf , Mirko Schaper and Olexandr Grydin

Published/Copyright: July 3, 2015

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From the journal Materials Testing Volume 57 Issue 7-8

Abstract

A device and the basic technology has been developed for tensile testing pipe sections samples (tensile testing PSS) for quantitative estimating ultimate tensile and yield stresses in ring samples (PSS samples) cut from pipes. This tensile testing device provides the opportunity for compensating frictional forces during the tensile test, and using exchangeable bearings, the device can be adapted to a wide assortment of pipes. Research has been carried out regarding the shape and size of a stress concentrator introduced into the sample. Relationships have been derived between the shape of the tensile loading curves and the characteristic forces for different types of stress concentrators. It is proposed to use PSS with stress concentrators to prevent plastic deformation in one of the supporting sections (this also allows to correlate the applied forces to one section). The concentrator should be introduced into the tube wall of the sample as a drilled hole. This method is comparatively simple with respect to established testing methods.

Kurzfassung

Eine Prüfvorrichtung und die grundlegende Technologie zur quantitativen Bewertung von Zugfestigkeit und Dehngrenze mittels Zugversuchen an Rohrabschnitten (Ringzugversuche) wurden entwickelt. Die Prüfvorrichtung bietet die Möglichkeit zur Kompensation von Reibungskräften während der Prüfung. Dank austauschbarer Lager ist diese für eine Vielzahl von unterschiedlichen Rohren verwendbar. Die Untersuchung befasst sich eingehend mit der Form des Probenkörpers sowie der Größe des Spannungskonzentrators. Zusammenhänge zwischen den Kurvenverläufen und den charakteristischen Kräften, ausgehend von verschiedenen Spannungskonzentratoren werden dargestellt. Für derartige Tests bieten sich Rohrabschnitte mit lokaler Spannungskonzentration an, um plastische Deformationen in einem der gelagerten Bereiche zu vermeiden (dies erlaubt die Spannungskonzentration der aufgebrachten Kräfte auf einen Bereich). Zur Spannungskonzentration an der Probe sollte eine Durchgangsbohrung in die Rohrwand eingebracht werden. Im Vergleich zu üblichen Prüfverfahren ist die vorgestellte Testmethode eine einfache und anwendungsfreundliche Möglichkeit.

§Correspondence Address Dipl.-Ing. Lars Oliver Wolf, Leibniz Universität Hannover, Institut für Werkstoffkunde, An der Universität 2, D-30823 Garbsen, Germany, E-mail: wolf@iw.uni-hannover.de

M. Sc. Anatolii Andreiev, born in 1990, is Scientific Assistant and PhD student at the Department of Metal Forming at the National Metallurgical Academy of Ukraine. He works on deformation modes of seamless tubes and pipes production.

Prof. Dr. Oleksandr Golovko, born in 1972, is Chair of the Department of Metal Forming at the National Metallurgical Academy of Ukraine. His scientific interests relate to extrusion and integrated technologies in light alloys production.

Prof. Dr. Iaroslav Frolov, born in 1975, is Vice Chair of the Department of Metal Forming at the National Metallurgical Academy of Ukraine. His scientific interests concentrate on relations between properties of metal and deformation and thermal modes of treatment.

Dr.-Ing. Florian Nürnberger, born in 1977, is Chief Engineer at the Institut für Werkstoffkunde (Materials Science) of the Leibniz Universität Hannover, Germany. His main research interests are integrated heat treatment processes.

Dipl.-Ing. Lars Oliver Wolf, born in 1985, is Scientific Assistant and PhD student at the Institut für Werkstoffkunde (Materials Science) of the Leibniz Universität Hannover, Germany. His research interests concentrate on heat treatment processes of HSLA steels as well as of quenched and tempered steels.

Prof. Dr.-Ing. habil. Mirko Schaper, born in 1966, is Head of the Chair of Materials Science (Universität Paderborn, Germany). His scientific topics are design and characterization of new high-strength metallic-based materials, microstructure specific material modeling and development of casting technologies.

Dr. Olexandr Grydin, born in 1976, is Chief Engineer at the Chair of Materials Science (Universität Paderborn, Germany). His scientific interests lie in the field of materials processing technologies such as twin-roll casting, extrusion of light metals and integrated heat treatment as well as materials characterization and mathematical modeling of their behavior.

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Published Online: 2015-07-03

Published in Print: 2015-07-15

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https://doi.org/10.3139/120.110759