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Volume 48 Issue 10
Issue of
Materials Testing
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Contents
Journal Overview
Contents
Inhalt/Contents
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May 26, 2013
Inhalt
Page range: 479-479
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Fachbeiträge/Technical Contributions
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May 26, 2013
Durchgängige Betrachtung einer Stanznietverbindung mit Fokus auf dynamische Belastungen
Gunter Haberkorn, Erich-Walter Blümcke, Klaus Thoma
Page range: 486-492
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Abstract
Kurzfassung Im Zuge des Leichtbaues von Fahrzeugkarosserien kommt neben einer Vielzahl von Materialien auch eine Vielzahl unterschiedlicher Fügetechniken zur Anwendung. Um diese in der numerischen Berechnung zu berücksichtigen, sind umfangreiche Kenntnisse der Phänomenologie der Verbindung einschließlich des Versagens notwendig. Es wird eine Möglichkeit der Untersuchung von mechanischen Verbindungen am Beispiel der Stanznietverbindung aufgezeigt. Dies umfasst die Kombination von Versuchen und der numerischen Simulation, welche bei der Prozesssimulation beginnt und über ein Detailmodell hin zum abstrahierten Simulationsmodell für die Gesamtfahrzeugberechnung führt. Erste Ergebnisse werden vorgestellt und auf ihre Relevanz im Kontext einer Gesamtfahrzeug-Crashsimulation hin bewertet.
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May 26, 2013
Nitriding of a 42CrMo4 and a 34CrAlNi7 steel in a fluidized bed furnace
Zekeriya Cömert, Polat Topuz, Ahmet Sagin, Ahmet Topuz
Page range: 493-497
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Abstract
This contribution presents a study about the design and the manufacturing of a fluidized bed furnace. Nitriding was carried out by using fluidized bed furnace and optimum process parameters were determined for nitriding. In these experiments DIN 7225 and DIN 8550 steels were used, and as a first step two types of steel were hardened and tempered. Nitriding was carried out by using N 2 + NH 3 at 520°C and 570°C. Nitriding times were selected as 3, 6 and 12 hours. The thickness of nitride layers varied from 6.1 to 39.73 mm. The hardness of nitride layers varied from 605 to 1114 HV. The tensile strength of the specimens were found between 618 and 1162 MPa. Their yield strength values varied from 479 to 939 MPa and their impact resistance values were found between 2.25 J/cm 2 and 84 J/cm 2 . Effect of nitriding on the mechanical properties of the specimens are discussed.
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May 26, 2013
Analysis of the Influence of the Specimen Shape on the Zone of Homogeneous Stress in Tensile Test
Valeriy Pidvysotskyy, Pawel Jerzy Matuszyk, Hermann Bloching
Page range: 498-503
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Results of the analysis of the influence of the specimen shape and grip-end length on the homogeneous strain in original gauge length are presented in the paper. All the results were obtained for the 316L austenitic stainless steel and for different cross-sections of the sheet specimens. The calculations were performed using program Abaqus/Explicit based on the finite element model (FEM) for the deformation process. Correlation between the strain distribution in the sample and such parameters as transition radius and grip-end length is presented in the paper.
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May 26, 2013
Quantitative Analysis of Austenite Transformation in a Stainless Steel Syringe Cannulae Weld
Marin Lita, Laurentiu Roland Cucuruz, Carmen Firu Opris
Page range: 504-509
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X-Ray diffraction analysis has been performed to determine the quantity of the ferrite-martensite mixture transformed from austenite in the weld of syringe cannulae made from 1.4301 (AISI 304) stainless steel. The analysis was conducted in order to explain the appearance of cracks during cold drawing of the tubes (f = 0.6 mm) from which the cannulae are made. It was found out that cracking occurred in the weld during cold drawing of the tubes under 2 mm diameter, when the skelp supplied by Teledyne Rondney Metals (TRM) was replaced with the skelp provided by Sumitomo Metal Industries Ldt Naoetsu Works (SMI-1). In order to ensure a good performance of the manufacturing process, cannulae made from the same steel mark (50 kg), supplied by different producers, were investigated. The quantitative analysis of austenite transformation in the cannulae weld was conducted using the X-Ray diffraction spectra. These emphasize significant austenite transformation differences (from 39.7 % to 86.6%) in the cannulae weld made from different skelps. Magnetic qualitative analysis of the entire cannulae material confirms the same austenite transformation tendency. Cracking of the cannulae made from SMI-1 skelp is explained by the strong stress inside of the welding area due to the large quantity of austenite transformed in the ferrite-martensite mixture (86.6%).
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May 26, 2013
Zur Umfangsbestimmung angeschnittener Teilchen
Konrad Breitkreutz, Nicole Bürger
Page range: 510-512
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Kurzfassung Nicht nur steigender Kostendruck zwingt zu immer stärkerem Einsatz automatischer Bildanalysesysteme im metallographischen Labor. Auch der Wunsch nach mehr Unabhängigkeit vor subjektiven Urteilen menschlicher Beobachter veranlasst verschiedene Gruppen, Normen, die mit Richtreihentafeln arbeiten, zu computergeeigneten Vorschriften umzugestalten. Die Vorschriften sollten solche reproduzierbare Ergebnisse liefern, dass sie zur Kontrolle vertraglich zugesicherter Produkteigenschaften geeignet sind. Gleichzeitig ist es wünschenswert, die Teilchencharakteristika so zu wählen, dass ein Bezug zu den vorherigen Richtreihenbildern bestehen oder erkennbar bleibt. Der vorliegende Beitrag beschäftigt sich mit der zuverlässigen Bestimmung des Umfangs angeschnittener Teilchen.
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May 26, 2013
Ermittlung der Versagensursache von Verschlusskörpern einer Innenhochdruckumformmaschine
Gunter Kullmer, Manuela Sander, Hans Albert Richard
Page range: 513-519
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Kurzfassung Bei zwei Verschlusskörpervarianten einer Innenhochdruckum- formmaschine, die aus Stahlguss gefertigt waren, sind während des Betriebs im Kopfbereich Risse entstanden. Zur Ermittlung der Ursache für die Rissentstehung werden die Bruchflächen begutachtet und Finite-Elemente-Spannungsanalysen durchgeführt. Die Schadensanalyse erfolgt sowohl aus Sicht der klassischen Festigkeitslehre als auch der Bruchmechanik. Es zeigt sich, dass trotz teilweise hoher Spannungskonzentrationen Gussfehler und Reparaturschweißungen von Gussfehlern wie Anrisse wirken und für das Versagen der Verschlusskörper verantwortlich sind.
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May 26, 2013
Normung von Prüfverfahren für Holzschutzmittel
Eva Ludwig
Page range: 520-521
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Kurzfassung Der Artikel gibt einen allgemeinen Überblick über die Arbeiten im Arbeitsausschuss NA 062-04-12 AA „Prüfung von Holzschutzmitteln‟ des Normenausschusses Materialprüfung (NMP) im DIN Deutsches Institut für Normung e.V.
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May 26, 2013
Normung auf dem Gebiet der Mineralöl- und Brennstoffnormung
Michaela Treige-Wegener, Hans Thomas Feuerhelm
Page range: 522-524
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Kurzfassung Der Normenausschuss Materialprüfung (NMP) ist wie bereits im Porträt (MP 12/2006) dargestellt in verschiedene Fachbereiche aufgeteilt. Die Normung auf dem Gebiet der Mineralöle und Brennstoffe wird vom Fachbereich 6, dem Fachnormenausschuss für Mineralöl- und Brennstoffnormung (FAM) bearbeitet.
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May 26, 2013
Normung auf dem Emailgebiet
Margarete Otto
Page range: 525-526
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Kurzfassung Der vorliegende Beitrag gibt einen Überblick über die Normungsergebnisse des im DIN Deutsches Institut für Normung e.V. für das Gebiet der Prüfung von Emails zuständigen Arbeitsausschusses. Es wird auf die enge Zusammenarbeit zwischen den Technischen Komitees der Internationalen und Europäischen Normungsorganisationen auf dem Emailgebiet eingegangen und die daraus resultierende Bedeutung des nationalen Arbeitsausschusses NMP 163 hervorgehoben.
Vorschau/Preview
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May 26, 2013
Vorschau
Page range: 531-531
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Journal Overview
About this journal
Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.
All articles are subject to thorough, independent peer review.
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