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Fracture Mechanics and Vibration Resistance

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Especially in mobility applications, metallic components are exposed to permanent stress changes. The Wöhler curve is of central importance in the design of a component – especially for materials such as aluminium which do not have a "classic" fatigue strength and therefore have to be tested experimentally up to the highest load cycles.
The strength of the LKR lies here, on the one hand, in the high test speed (typically: 80 Hz) as well as in the full flexibility with respect to sample shape and load condition.


  • Vibration testing and Wöhler curves of standard, special samples, components
  • Short test duration thanks to resonator testing machine (RUMUL Testronic)
  • Detection of hardening and softening behaviour during the individual tests
  • Tests at room and increased temperature
  • Very small (<1 kN) to very large loads, at freely selectable load levels (pull/pressure)

pendulum machine



Test ProcedurePerformance ParametersApplication
Fatigue test in the time and fatigue strength range
  • Standard samples and components up to 560mm component height
  • Amplitudes: -100 to +100kN
  • Test frequencies up to 140Hz
  • Load ratio (R value) freely selectable
Creation of Wöhler curves, release dates for newly developed alloys
Fatigue testing at elevated temperature
  • Room temperature up to 900°C
Materials at real operating temperatures
Oscillation of notched impact and crack tests
  • Recordings for:
    • K1C
    • Notched impact crack (up to 10x10mm)
  • Determination of crack length (light microscope)
Further fracture-mechanical analyzes with a precisely defined crack length

Accredited testing methods

  • DIN 50100: "Dauerschwingversuch"