The type of resonance-testing-machine Testronic of the company RUMUL is designed for forces up to 250 kN and displacements up to 8 mm.The realizable frequency ranges from 45 to about 260 Hz. The force is applied by a mass in his 8 stages in total variable mass oscillator and thus permits the cover a broad frequency spectrum and amplitude relative to the respective sample stiffness. Thus a relatively high degree of flexibility is ensured, which regards the dimensions and geometry component similar samples, so that the testing machine this completes the power spectrum of VHCF laboratories.With the help of the specially tuned Testronic resonant testing machine software from RUMUL besides the general experimental control there is also the possibility of selective detection of crack propagation according to ASTM E647. Here the software offers the possibility of crack detection by the indirect potential method, the direct potential method and compliance method.
