Dynamic Direct Simple Shear Apparatus (DSS)
This stand-alone electromechanical test apparatus is a robust construction device including of 2 high end dynamic force actuator and 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.
The device gives the possibility to perform tests on different sample sizes up to 150mm (simple shear test) in diameter and also can run direct shear tests up to 100mm sample size. The frame is a is a frame is heavy construction with high stiffness to reduce the deflection and vibrations which could influence the accuracy of measurements during dynamic repeated loading tests.
It applies vertical and horizontal independent loads by electromechanical dynamic actuators which enables each axis to be controlled in displacement (strain or velocity) mode as well as load control.
The main advantage of device is an accurate testing of soil parameters without tilting and friction between shear test components. The high quality and low friction double linear guides used to ensure strength and alignment without tilting in normal and shear directions.
- Features
- Specifications
- Software
- Standards
- Applications
- High stiffness load frame
- Passive or active height control
- 2 number of rigid bars built into system to maintain rigidity of machine
- Minimal rotation of Top cap during shearing
- Closed loop controlled normal and shear stress
- Low friction sample slip rings for specimen confinement (k0 condition)
- Performs drained (constant load) and undrained (constant volume) tests
- Two porewater ports at top and bottom for saturated conditions
- Porous discs with different roughness and surface are available i.e. plane, grooves, ridges and embedded pins
- Unique shear loading measurement using two multi directional load cells
- High quality and low friction double linear guides used to ensure strength and alignment without tilting in normal and shear directions
- High speed dynamic controller (10 kHz) for monitoring of measured values and closed loop control e.g. load, displacement, position
- Applies different types of wave form like: Sinusoidal, Square, Triangular, Haversine, Saw Tooth, Inverted Saw Tooth, Rectangle, and User Defined wave forms.
- Real-time data and graph display
- Ethernet Port for fast data transferring to PC
- Safety functions to prevent overload and over travel
|
Load type |
Electromechanical |
|
Normal force |
5kN / 10kN |
|
Shear force |
5kN / 10kN |
|
Accuracy class |
0.1% |
|
Force resolution |
<0.00001kN |
|
Frequency |
0.0001 up to 5 Hz |
|
Speed range |
0.0001 - 2000 mm/min |
|
Resolution |
0.01 N |
|
Max. settlement |
25mm (+/- 12.5 mm) |
|
Max. Shear displacement |
30 mm (+/- 15 mm) |
|
Displacement resolution |
0.001mm |
|
Spindle Stroke |
50mm |
|
Circular Sample Sizes |
Ø 50 mm Ø 50,5mm(20.00 cm²) Ø 60 mm (28.27 cm²) Ø 63 mm (31.2 cm²) Ø 66.8 mm (35.0 cm²) Ø 70 mm Ø 71.4 mm (40 cm²) Ø 79 mm (50 cm²) Ø 94.9 mm (70 cm²) Ø 100mm |
|
Computer Interface |
Ethernet |
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.
Control Parameters: The normal load (axial) and Shear load (Horizontal) can be operated in constant, ramp or cycle modes in three different operating modes:
- Velocity control
- Force control
- Displacement control
Depends on the requirement of the customer one or several modules would be delivered with main software, such as:
- Data Acquisition, processing and device management (DPD) Module
- Consolidation Stage (Single stage, multiple stage or over consolidation mode)
- Static Shear module (Displacement or stress controlled)
- Cyclic simple shear test Constant Normal Stress test
- Constant Normal Height test (active height control)
- Constant normal stiffness test (CNS)
- Shear stress-controlled test (constant, ramp and cyclic)
- Shear displacement control (constant, ramp and cyclic)
- Calculation of shear stresses
- Low speed creep testing
- ASTM D-6528
- CEN ISO/TS 17892-10
Standard Test Method for: Consolidated Undrained Direct Simple Shear Testing of Cohesive Soils.
Geotechnical investigation and testing -- Laboratory testing of soil -- Part 10: Direct shear tests
- Detailed information will follow soon
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