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Material Testing Dynamic
RUMUL - Russenberger Prüfmaschinen AG
Development and design of resonant testing systems and
machines for dynamic material testing.
Resonant testing machines are stressing specimens or
structures with a dynamic load superimposed to a static
load. The dynamic load is generated by an oscillating
system (resonator) which runs in its natural frequency.
The resonator is excited by an electromagnet system. Due
to the resonant effect the power consumption is very low
(typically below 1kW), the operating frequency is in a
range of nearly up to 300 Hertz.
The machines are very often used for fatigue tests (S/N-curves),
or in fracture mechanics for pre-cracking and crack
propagation tests.
These are the advantages of such equipment compared to
servo-hydraulic ones. All kind of tests with a high
number of load cycles are beneficial applications for
resonant testing machines because of the high testing
frequency and the resulting very short testing time with
very low power consumption.
The additional advantage in comparison to
servo-hydraulic systems with its actuators, valves and
pumps is that maintenance is not required due to the
wear resisting construction.
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