Ring Tensile Test to ISO 8496 & DIN 50138

Q: How is the ring tensile test to ISO 8496 and DIN 50138 performed?

In the ring tensile test, a ring cut from a tube is placed over two tension bolts and pulled crosswise to the tube axis. The standard does not explicitly specify the position of the weld seam; however, a position offset to the tensile direction by 90° is recommended to eliminate influences on the weld seam through the contact point in the specimen grips. If nothing else is specified, the test is performed up to break. Characteristic values such the force curve or displacement curve can be evaluated using the testXpert testing software. The ring tensile test is used for tubes with a maximum outer diameter of 150 mm, an inner diameter >100 mm, and a maximum wall thickness of 40 mm.

Tensile test on metal tubes

The ring tensile test to ISO 8496 and DIN 50138 is a test method for tubes to evaluate the ductility of the welded joint and to detect surface defects.

Testing of steel tubes such as the ring tensile test is also described in Annex 2 of ASTM A370.

The following content explains the key aspects. For standard-compliant testing to ISO 8496 and DIN 50138, it is essential to purchase the complete standard.

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How is the ring tensile test to ISO 8496 and DIN 50138 performed?

In the ring tensile test, a ring cut from a tube is placed over two tension bolts and pulled crosswise to the tube axis. The standard does not explicitly specify the position of the weld seam; however, a position offset to the tensile direction by 90° is recommended to eliminate influences on the weld seam through the contact point in the specimen grips. If nothing else is specified, the test is performed up to break. Characteristic values such the force curve or displacement curve can be evaluated using the testXpert testing software.

The ring tensile test is used for tubes with a maximum outer diameter of 150 mm, an inner diameter >100 mm, and a maximum wall thickness of 40 mm.

Ring Tensile Test to ISO 8496 & DIN 50138

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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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