Vibrationsprüfstand (VT)

Vibration Teststand

Thermal resistance Rthwith cyclical mechanical loads
The vibration test, too Forced Mechanical Cycling (FMC) called, is an extension of the delamination test, which is carried out using the ZFW TIM tester. The vibration test is carried out on a specially designed test bench. Designed with three test units that are decoupled from one another, the test stand enables up to three samples to be examined in parallel. The software can change the initial gap width in a highly dynamic and precise swing. In addition to the adjustable vibration parameters, the individually adjustable operating points can also be force-controlled.
The main difference to the previous investigation on the TIM tester are the significantly higher frequencies of up to 200 Hz. The maximum amplitude (peak to peak) is 90 µm, the maximum acceleration is approx. 15 m / s².
In addition, tensile and compression tests in the sub-micrometer range can be carried out. With tensile and compressive forces up to a maximum of 500 N, the smallest gap changes can be resolved.

In summary, the following error mechanisms can be checked with the ZFW vibration test bench:
  • Pump-out, bleed-out, dry-out
  • Mechanical stability
  • Particle delamination
  • Embrittlement
  • Agglomeration
  • Adhesion and cohesion

During the measurement, the gap, force and the change in thermal resistance are recorded. The vibration test (FMC) uses a purely mechanical movement to simulate the real gap expansion of a driving or random profile. Influencing variables, such as driving profiles with specification of a sample mean temperature, can be checked here. As a result, it is now possible to make qualitative and quantitative statements about the change in thermal resistance as a function of the number of cycles or the change in gap (tension / pressure).
Example of failure mechanisms:

The mechanical stability of a material can be examined with the help of very high frequencies and dynamically applied force curves.

These tests are of essential importance for vibrating components with high frequencies. Effects such as pump-out, bleed-out and dry-out can be simulated in the laboratory as well as embrittlement or agglomeration failure and transferred to the real component.
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