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Kappa LA Spring

Lever arm creep testing machine with spring assembly for tests up to 100,000 hours Download
Test load
  • 50 - 100 kN
Temperature range
  • -80 to +1,200°C
Type of test
  • Creep
  • Stress Relax
  • HE
  • CCG
  • ISO 204
  • ASTM E139
  • EN 2002-005
  • ASTM F519
  • ASTM E1457

The ideal testing machine for force and strain controlled long-term tests

The versatile lever arm creep testing system with pretensioned spring was developed for classic and advanced creep tests with constant or stepped force application and long-term tests up to 100,000 hours. Wear-free flexible joints guarantee optimal lever arm mounting and precise force application in a wide load range.

The Kappa LA Spring lever arm creep testing machine offers a wide range of applications in ambient and high-temperature conditions:

  • Crack growth/widening tests
  • Determination of hydrogen embrittlement
  • Stepless load definition and load block tests possible
  • Relaxation tests
  • Creep tests up to break:
    - Creep rupture
    - Stress rupture
  • Classic creep tests

Advantages & features

Advantages & features

Specific machine design
Axial alignment
Precise specimen temperature
Intelligent electronics and software
Optimal extensometer
Wide range of accessories
Ready for changes in future technology

Specific machine design

  • Mechanical testing system for long-term creep tests up to 100,000 hours
  • The combination of the pretensioned spring, the drive and the precise Xforce load cell from ZwickRoell ensures smooth application of the test load.
  • High drive control frequency of 1000 Hz. This allows for precise force and strain control for a wide range of applications.
  • Patented wear-free flexible joints ensure high-quality lever arm mounting.
  • Wide force measurement range for tests with small and large forces according to DIN EN ISO 7500-1 in class 0.5 and class 1
  • Automatic end of test after specimen break (break detector)

Axial alignment

  • Alignment to ASTM E1012
  • Wear-free flexible joints contribute to axial alignment according to ISO 204, ASTM E139, ASTM E292 and NADCAP requirements
  • Spherical mounting ensures self-adjusting alignment in tensile tests and low, standard-compliant flexural stress (± 10%)

Precise specimen temperature

  • The ZwickRoell high-temperature furnace is specially designed and optimized for creep testing.
  • The high-temperature controller can be integrated in the base of the testing machine, saving space.
  • One, two or three specimen thermocouples – dependent on the specimen length
  • Automatic and specimen-centered entrainment of the thermocouples and the furnace – also in case of long elongations and long test duration
  • Operator-independent temperature control with automated adaptation of the control parameter for influencing factors such as
    - Heating rates and target temperature
    - Specimen size, material and shape
    - Number of thermocouples
  • Guaranteed uniform temperature distribution along the specimen
  • No overshooting of the specimen temperature upon reaching the target temperature
  • Empirical determination of the control parameters for individual temperatures is no longer necessary.
  • Wide temperature range with tolerances better than ISO 204 and ASTM E139:
    200°C ... 400°C: ± 2K
    400°C ... 1,150°C: ± 1K

Intelligent electronics and software

  • Consistent workflow orientation reduces training needs to a minimum
  • Strain and force controlled load application (stepless/in blocks)
  • Selectable digital closed loop force, stress and strain controlled creep tests and stress relaxation tests, as well as user-defined load cycles
  • Easy operation during test performance and test result evaluation
  • Integrated temperature control of the high-temperature controller
  • Temperature control, recording and documentation prior to the test (heating phase)
  • Well designed data security concept

Optimal extensometer

Reliable strain measurement is based on an extensometer that has been optimally matched to the testing application. Therefore, selection of the right extensometer is crucial and is the basis for repeatable test results. ZwickRoell engineers are available to help you select the right extensometer for your application, eliminating any guesswork in deciding on an optical or contact-type extensometer:

  • Non-contact extensometer videoXtens
  • Side-attaching sensor arm extensometer:
    - makroXtens with high-temperature sensors
    - Side entry extensometer
  • Axial-attaching sensor arm extensometer:
    - Rod-in-tube extensometer
    - 4-rod extensometer
  • DCPD extensometer for measuring the crack growth

Further details are available here.

Wide range of accessories

The wide selection of machine accessories supports many application possibilities, allowing for testing with one and the same testing machine at ambient temperature, high temperature and ultra-high temperature.

  • Furnaces with different dimensions and slots
  • Specimen grips and load strings
  • Contact-type and non-contact extensometers
  • Safety enclosures

Ready for changes in future technology

Modular design means that the testing system can be converted or retrofitted whenever required. Moreover, testControl II machine electronics are compatible with future-generation ZwickRoell software.

Technical overview

We will find the optimal solution for your creep test application. Please feel free to contact our experts.

We will be happy to discuss your needs.

Contact us

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