Marking turned tensile test specimen

efficient marking of turned tensile specimens for manual measurement of elongation

With this marking device, turned tensile specimens can be easily provided with marking points in order to manually measure the elongation at break after the tensile test. The sample is marked by means of a drop weight. The impact marking of the round tensile specimens is an old proven method for determining the elongation at break.

However, the markings of the L0 must be applied exactly. By means of the horizontal digital scale integrated in this device, the position stops can be set more precisely. Once this has been done, a sample is clamped between the tips and the drop weight can be lifted (at the first center point) for the first imapct. After the marking the anvil can be moved to the second position. After taking out the double marked sample the next marking starts from this point. In this way, a large number of round tensile specimens can easily be provided with reference marks for to measure elongation at break.

Measuring elongation at rupture

To determine the elongation at break, the broken specimen can be placed in a prism (optional accessory) so that the axes of the two fragments form a straight line. Then the extension (Lu) is measured with a caliper gauge. Ideally this will be measured with a digital caliper gauge and transfered by click on the botton  into the field of the open test software.

 

  • If a low sample volume does not allow the purchase of a cost-intensive extensometer, this method can be used to test in compliance with standards
  • For critical applications, it is also sometimes necessary to measure the elongation at break using conventional methods
  • Furthermore, manual measurement of elongation at break according to various standards is mandatory (ASTM / NADCAP / BS / API).

The marking deviceis (manufactured in Germany) can be operated efficiently and applies the desired sample marking within seconds:

  • Clamp turned specimens
  • Move anvil and centre punch to the stop
  • Lifting and dropping the drop weight
  • Move anvil to 2 position
  • Repeat the beating process - done

This martler device is suitable for the following turned round samples with:

  • smooth cylinder heads
  • Thread heads
  • shouldered heads
  • with conical heads

Inquiry marking device for turned samples