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- Hydraulic grips for tensile tests on steel pipes
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- Tensile testing machine inspekt 1500 kN
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- Tensile testing machine inspekt 600 kN
Tensile test on steel pipes
Universal testing machines inspekt 400 up to 2500 kN
Test range and field of application
The universal testing machines in the inspekt series are designed for tensile testing on pipes and pipe strip specimens. They cover a load range from 400 kN to 2500 kN and meet the requirements of DIN EN ISO 6892-1:2020.
Equipment of the testing systems
Most testing machines are equipped with parallel-closing hydraulic grips. These ensure a consistently high clamping force, which can be set either constantly or proportionally over the duration of the test.
Test method
The tensile tests can be carried out using different methods:
- Strain-controlled according to method A
- Tension-controlled according to method B
- With constant pull-off speed
The tensile tests are used to determine the following strength and deformation parameters:
- Yield strength
- Tensile strength
- Elongation at break
- Slope of the elastic part of the stress-strain curve
Test setup for different pipe diameters
- Smaller pipes can be tested as complete workpieces. The pipe ends are clamped in the hydraulic specimen grips. To avoid pre-damage, the ends can either be pressed together or reinforced with a plug.
- For larger pipe diameters, tensile specimens are often taken from the pipe wall.
Special strain measurement for longitudinally welded pipes
Special extensometer measuring arms are used for pipe specimens that are clamped in a pressed state and tend to warp concavely during the test. These ensure that contact between the cutting edge and the specimen is maintained until breakage.
Special features of the measuring arms:
- Double cutting edge made of hardened HSS tool steel for high wear resistance
- Folding mechanism that dissipates the energy in the event of breakage and protects the measuring system
- Particularly advantageous for brittle-fracturing materials
Optional extensions
The testing machines can optionally be equipped with a measuring station for length measurement and weight determination of the pipe samples in order to record additional parameters directly.
