Static Systems

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The direct shear test system is designed to determine the shear strength of intact or jointed rock or concrete specimens. Various samples in the form of cylindrical, prismatic, cubical or irregularly shaped segments of different sizes can be tested by this system.
The closed loop servo control shear apparatus includes a special frame construction consisting of two stiff frames for vertical force and shear force, combined in a special configuration to avoid friction and torque.
The system includes a hydraulic power pack in combination with two separate valve systems, two-separate controllers and two low friction hydraulic cylinders.
The complete system is fully automated and controlled by our flexible and programmable GEOsys software.
Various sensors, transducers, shear boxes and experiment options are available.

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High stiffness robust constructed frame
Suitable for precise direct shear tests on rocks, sliding surfaces and building materials
Highly precise force transducers have been applied to measure and control shear stress and optionally normal stress
Includes horizontal displacement transducer to measure shear strain rates (and closed-loop control) and vertical displacement transducer to measure axial deformation
The shear boxes consist of a tilting free lower and upper shear frame, which is guided by linear bearings, a fixed upper shear frame and a guided load piston
Easy sample fitting and cleaning
Transparent test area guard with front security door
Different samples in cylindrical, prismatic, cubical or irregularly shaped segments and in different sizes
High-speed closed-loop control of load, displacement and position
The system is capable of applying different stress paths or strain rates
Hydraulic power packs with high quality noise protection and emergency functions
Digital setting of PID control parameters for the optimization and tuning of test parameters
Real-time graphics software with zoom and freeze functions with printing available at any time
Expandable real-time high resolution data acquisition and a closed-loop control system (20 bit)

Load type	Servo-hydraulic
Axial force/shear force	100/100 kN, 200/200 kN, 500/500 kN
Specimen size	Up to 300300300 mm
Settlement, resolution	50 / 0,001 mm
Accuracy	0.1%
Shear displacement	50 mm / 100 mm
Cyclic load	Up to 500 kN (on request)
Load frequency	On request