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 for Metals – ZwickRoell GmbH & Co. KG

As Global Industry Manager, he is responsible for the industry strategy in the metals sector with a focus on market observation, further development of testing solutions and sales support in the international environment.

He has extensive experience in standardization work and is actively involved in various committees, including the international ISO committee “ISO/TC 164 Mechanical Testing of Metals” and national DIN working groups such as NA 062-01-42 AA Tensile and ductility testing for metals and NA 062-01-47 AA Impact test for metals and mechanical-technological testing of metallic pipes.

His academic career began with a degree in mechanical engineering (B.Sc. & M.Sc.) at the Karlsruhe Institute of Technology (KIT). After holding international positions in mechanical engineering, he worked as a research assistant at the Friedrich-Alexander-University Erlangen-Nuremberg with a focus on material characterization and sheet metal forming. He dedicated his doctorate to the topic of deep drawing processes with drawing beads.

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