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Testing Solutions » By Test Type » Tension » Steel Cords

Tensile Testing of Steel Cords

Materials

  • Metals

Test Types

  • Tension
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Steel cord is formed by twisting multiple strands of steel wires together to form a cord structure. This is often used as a reinforcement material in conveyor belts and radial tires for passenger cars, buses, or heavy equipment vehicles. Compared to other traditional reinforcement materials like nylon, steel cords possess superior mechanical properties, such as higher tensile strength and modulus and better heat resistance. When used as a reinforcement material in radial tires, it offers high road stability, improved steering response, and longer tire service life. Since some of the key performance indicators of tires are dependent on the reinforcing steel cord, it is important for an engineer to understand the properties of the tire cord and how it functions in a tire.

There are many challenges to account for when testing stranded wire. As stranded wire is not a consistent diameter, generally a nominal diameter is used (as defined in the product standard).  As well as the irregularity of the surface, when a specimen is pulled in tension each strand will rotate. Therefore, if a clip-on extensometer is being used, it must be able to rotate. It is also necessary to have a long gauge length, so Instron offers a 600mm G.L. extensometer with 15 degrees of twist available. When stranded wire breaks, the energy released at failure is substantial, and the specimen ‘splays’ out. This may cause damage to extensometers, machine or even operators.

The challenges of testing to this standard are:

  • Specimen gripping
  • Strain measurement
  • Safety

 

Instron's Solution:

  • Instron provides side action grips with wire strand inserts that ensure optimum grip face engagement and clamping surface area.
  • Instron’s E-series extensometers allow for a 600mm gauge length and specimen rotation, providing a robust strain-measurement solution.
  • Debris shields are available in many shapes and sizes, and can be interlocked to ensure operators are not in danger at any time throughout testing.

 

It is important to review the pertinent testing standards in order to fully understand the test setup, procedure, and results requirements.

5900 Series Premier Testing Systems Brochure

5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.

  • Products
  • 1/22/2019
  • 6.8 MB

Bluehill® Universal Software

Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: and Instron Connect – a new feature that provides a direct communication link to Service. Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill.

  • Products
  • 2/26/2017
  • 2.6 MB

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