MTS Landmark Tabletop - Manual (Page 32)

Description Component Item
Applies rotational forces to a specimen. The rotary actuator is
coupled to the linear actuator for axial-torsional load units. Rotary actuator 2
Measures the displacement of the linear actuator’s travel. The
linear variable displacement transducer (LVDT) is located inside
the actuator. LVDT 3
Raise and lower the crosshead hydraulically to accommodate
different specimen sizes. The lifts are small hydraulic actuators. Crosshead lifts 4
Moves up and down the column to accommodate different sized
specimens and fixtures. The crosshead is stiff and light weight;
it is one end of the force train. Crosshead 5
Provides additional protection against the crosshead slipping.
The clamp ring can be positioned anywhere along one of the
columns. Clamp ring 6
Measures the forces applied to specimen. It is a strain gage type,
accurate in both dynamic and static tests. Both axial and
axial-torsional force transducers are available. Force transducer 7
Dampen the load unit’s natural frequency to about 20 Hz. Isolation pads 8
Store hydraulic fluid under pressure to increase the actuator’s
response time. One accumulator connects to the pressure line;
the other to the return line. Accumulators 9
Serves as the junction point between the hydraulic power unit
(HPU), accumulators, servovalve, and actuator. The manifold is Manifold 10
mounted to the crosshead. It is also a hydraulic circuit that
connects the hydraulic components.
Control both the amount and the direction of fluid entering the
actuator using a high response valve. They determine how fast
the actuator can move. A servovalve is required for each actuator. Servovalves 11
Applies axial forces to specimens. The actuator is a hydraulically
powered device that provides linear displacement of (or forces Linear actuator 12
into) a specimen. Grips and fixtures can be mounted to the
actuator.
The Emergency Stop button is standard; the other controls are
optional. Control panel
Grip controls
13
Clamp and unclamp hydraulically controlled grips during
specimen installation and removal.
Crosshead lift
control
Controls the crosshead lifts to raise and lower the crosshead
hydraulically.
Emergency stop
Removes hydraulic pressure from the load unit and issues an
interlock signal to the controller to stop the test program.
32 MTS Landmark™ Tabletop Load Units Product Information
Introduction