ISO 8495| DIN 50137 Ring-expanding test

Q: How is the ring-expanding test to ISO 8495 and DIN 50137 performed?

For a ring-expanding test, a ring cut from the end of a tube is expanded using a conical mandrel until fracture occurs. Identical specimens can be stacked on top of each other when performing the test (see sketch). The conical mandrel is pressed into the rings, until the expansion reaches the specified value. The test is considered passed if no cracks are detected in the tube after the test. The ring-expanding test is performed on tubes having an outside diameter from 18-150 mm and a wall thickness from 2-16 mm.

Compression test on metal tubes

The ring-expanding test to ISO 8495 and DIN 50137 is used to assess the ability of tubes to undergo plastic deformation and to reveal production defects on the outer surface of the tube and within the tube wall. Defects can be detected based on the appearance of the fracture.

The following content explains the key aspects. For standard-compliant testing to ISO 8495 and DIN 50137, however, it is essential to purchase the complete standard.

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How is the ring-expanding test to ISO 8495 and DIN 50137 performed?

For a ring-expanding test, a ring cut from the end of a tube is expanded using a conical mandrel until fracture occurs. Identical specimens can be stacked on top of each other when performing the test (see sketch). The conical mandrel is pressed into the rings, until the expansion reaches the specified value.

The test is considered passed if no cracks are detected in the tube after the test.

The ring-expanding test is performed on tubes having an outside diameter from 18-150 mm and a wall thickness from 2-16 mm.

Ring-Expanding Test to ISO 8495, DIN 50137, ASTM A370

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ABOUT THE AUTHOR:

Dr. Harald Schmid

Global Industry Manager Metalle – ZwickRoell GmbH & Co. KG

Als Global Industry Manager verantwortet er die Branchenstrategie im Bereich Metalle mit Fokus auf Marktbeobachtung, Weiterentwicklung von Prüflösungen sowie der vertrieblichen Unterstützung im internationalen Umfeld.

Er bringt umfassende Erfahrung aus der Normungsarbeit mit und engagiert sich aktiv in verschiedenen Gremien: unter anderem im internationalen ISO-Komitee „ISO/TC 164 Mechanical Testing of Metals“ sowie in nationalen DIN-Arbeitskreisen wie dem NA 062-01-42 AA Zug- und Duktilitätsprüfung für Metalle und dem NA 062-01-47 AA Schlagzähigkeitsprüfung für Metalle und mechanisch-technologische Prüfung an metallischen Rohren.

Sein akademischer Werdegang begann mit einem Maschinenbaustudium (B.Sc. & M.Sc.) am Karlsruher Institut für Technologie (KIT). Nach internationalen Stationen im Maschinenbau forschte er an der Friedrich-Alexander-Universität Erlangen-Nürnberg als wissenschaftlicher Mitarbeiter mit Fokus auf Materialcharakterisierung und Blechumformung. Seine Promotion widmete er dem Thema Tiefziehprozesse mit Ziehsicken.

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