ZD 2500

Universal testing maschine 2500 kN / 500 kN cyclic

Since October 2017, a four-column universal testing machine with a tensile and pressure range with a maximum static load of 2500 kN and a maximum cyclic of 500 kN is now part of the equipment of the Otto-Mohr-Laboratory. It was installed as within the project  C3-I "Servo-hydraulic testing machine", funded by the Federal Ministry of Education and Research (BMBF). The machine is a custom product. It is suitable for cyclic long-term tests up to 25 Hz. The maximum free test length is 3100 mm. Thus, the machine reaches a total height of over 6 m.

Flat and round samples can be easily fixed by hydraulic clamping. The samples can be installed with a possible free sample length of 500 mm above or below the clamping in the machine. To apply the static loads, the crosshead is raised or lowered electromechanically with two ballscrews. The dynamic forces are applied via synchronised cylinders located on the crosshead, and supplied with oil from the existing central hydraulic unit. The maximum amplitude in the dynamic test range depends on the test frequency; for example, samples can be tested with a frequency of 10 Hz and an amplitude of 7.5 mm.

The machine was used to handle the numerous tests in the research project
C³ – Carbon Concrete Composite, e. g. to determine the tensile strength of rods or tendons made of carbon fibres under static and dynamic loads. Due to the universal construction of the machine also tests on other materials are feasible.

The machine control enables a force, distance or strain control and is freely programmable. It contains pre-programmed test programs for tendon tension tests according to ETAG 013, steel tensile tests according to EN ISO 6892-1 and pressure tests of building materials according to EN 12390-3. The data collection of all measurement signals is done synchronous with a maximum sampling rate of 14.4 kHz.

Technische Informationen | Technical information
Maximale statische Prüfkraft | Maximum static test load		2500 kN
Maximale zyklische Prüfkraft | Maximum cyclic test load		500 kN
Maximaler Kolbenweg | Maximum piston travel		50 mm
Maximale Prüffrequenz und zugehörige Amplitude (Auswahl) | Possible test frequencies and corresponding amplitudes (selection)		25 Hz – Amplitude 3,0 mm 10 Hz – Amplitude 7,5 mm 3 Hz – Amplitude 25 mm
Prüfraumbreite | Work space width		1300 mm
Prüfraumhöhe | Work space clearance		0–3000 mm
Einspannlänge | Clamping length		300 mm (unten und oben | below and above)
Mögliche einspannbare Prüfkörperlänge (bei Einschränkung der Prüfkörperbreite auch länger) | Possible clampable test specimen length (with restriction of the test piece width also longer)		3600 mm
Vorhandene Druckplatten | Existing pressure plates		500 mm × 500 mm