Unsaturated Direct Shear Apparatus

This special device was developed for direct shear tests, which can be achieved under different pore pressure conditions. Using a pressure chamber around the direct shear box, pore pressures up to 1000 kPa can be applied during the test.

This electromechanical test apparatus is a robust construction device including of high-quality mechanic and electronic components which produces repeatable test results and the excellent quality makes it suitable for research and also usual test applications.

It applies vertical and horizontal independent loads by electromechanical actuators which enables each axis to be controlled in displacement (strain or velocity) mode as well as load control. The apparatus with reversible electromechanical motor is used for direct shear tests and also residual strength test.

Option:

As a special edition we offer additional equipment for unsaturated direct shear tests.
In combination with modified HAEV-ceramic discs and a pore air pressure control system, unsaturated conditions with different suction stress ranges are possible.

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Suitable for highly precise direct shear tests in practise and research
The complete shear box system is made of stainless steel, incl. porous plates, load piston and water container for saturated conditions
The main advantage is an accurate testing of soil parameters without tilting and friction between shear box components (e. g. load piston, upper shear box, lower shear box)
The normal stress and the shear stress are closed-loop controlled by an electromechanical precision drive system
The device can be operated by the touch sensitive keypad or fully automatic by a computer with adecuate control software
Standard direct shear boxes:
- Square size: 60 x 60 mm ( 36 cm² )
- Square size: 100 x 100 mm (100 cm²)
- Circular: Ø 60 mm (28.27 cm²)
- Circular: Ø 71.4 mm (40 cm²)
- Circular: Ø 80 mm (50 cm²)
- Circular: Ø 94.4 mm (70 cm²)

Maximum shear force (standard)	5 / 10 kN
Maximum normal force (standard)	5 / 10 / 20 kN
Shear displacement	+/-25 mm
Accuracy class	0.1 %
Resolution	0.00001 kN
Shear rate	30 – 0.000001 mm/min

Bender Element Test Package
Extension package for Simple shear test (For ASA Model)
Extension package for Oedometer/Consolidation test (For ASA Model)
Extension package for Triaxial test (For ASA Model)
Temperature control package (For ASA Model) for low and high temperatures

GEOsys is designed for closed-loop controlled static & Dynamic tests for all test applications in material testing, such as stress-controlled, strain-controlled, any kind of waveforms like sine, rectangle, triangle, and predefined waves.

It is controlling and data acquisition software and also has different modules to run tests according to ASTM or other standard methods. Depends on the requirement of the customer one or several modules would be delivered with main software, such as: