Applications Piezocomposite

Material testing, impulse and power generation up to 50'000 N

 

A sample material is subjected to a short pulse or shock. The impulse response and the oscillatory behavior is recorded by a measuring system. The analysis (SRS shock response spectrum) provides information on:

  • material properties
  • structure and behavior
  • life expectancy of the sample

Figure 1: Hopkinson-impact arrangement i.e.: with steelbars for material tests under shock load (high expansion rates)


In comparison to previously used methods (e.g. impact excitation using a hammer) piezoelectric shock generators state of the following advantages:

  • reproducible impact excitation, power pulses <10µsec
  • high, adjustable repetition rates
  • high adjustable shock energy
  • pulse energies up to the joule range
  • compact dimensions
  • several shock wave generators can be synchronized

A square wave pulse generates the piezoelectric stroke. The piezoelectric stroke is generated by a square wave pulse. The electrical charge time of the piezoelectric stack is shorter than the duration of the axial front compression (speed of sound) in the piezoelectric stack. The mechanical stress states in the ceramics are highly inhomogeneous in space and time and require special adaptation measures regarding the design of the piezo-shock generator.

Power generation and acceleration in shock wave generators can be adjusted independent from the repetition rate of the pulse.

key characteristics of piezoelectric shock generators:

  • symmetric (two-sided) or asymmetric (one-sided) test set-up possible
  • the pulse generator is located at the commencement of the mechanical shock in mechanical contact with the test specimen
  • the mechanical energy balance may be adjusted by the type of the ceramic and the dimensions of the impact generator


Applications for shock generators are quality testing and the calibration of accelerometers.

High dynamic loads and inhomogeneous states can destroy conventional piezo actuators. In contrast, piezo composites with stack design are specifically developed for these conditions and guarantee a stable and lasting pulse load.

Piezocomposites in a stack design, however, can be specifically, referred to above states, dimensioned and keep the pulse loads.

Figure 3: double impulse generator - the impact propagation in the linked rods can be gathered with a strain gauge and Laser Doppler Anemometer

Figure 4: single impulse generator - a double pulse profile emerges because of superposition of primary pulsing and a delayed in time pulse


Standard piezo actuators are suitable only for a low frequency range. Piezocomposites in stack design are specially adapted for high frequencies of up to 60kHz. Hereby they achieve high power densities, furthermore high frequencies and acceleration.

Our Piezocomposite Actuators are used in different application fields. In this category you can find information, where and how the piezo actuators are used.

If you need more information or assistance for the right piezo product for your application, please contact us under info(at)piezojena.com or use our contact form!

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