The International Information Center for Geotechnical Engineers

Friday, 09 June 2017 12:03

Residual shear testing with Control's Shearmatic EmS

Shearmatic EmS is a standalone automatic machine by Controls Group, with Electromechanic Servoactuation for direct/residual shear testing.

 

Shearmatic EmS is a standalone automatic machine by Controls Group, with Electromechanic Servoactuation for direct/residual shear testing. It can also automatically perform the oedometric consolidation tests using the dedicated accessories. It incorporates two high-resolution stepper motors with high precision transmissions. It features a closed loop PID control optimized for automatic test performance at the touch of a button, dead weights and air compressor are no more necessary.

The user interface is based on a large 6” touchscreen colour display permitting to start, pause and stop the test, to choose the data recording mode, to show the readings during the test execution and to carry out the transducers calibration. The axial transmission of the horizontal force is accurately ensured by a straight connection between shear box, shaft and load cell. This design avoids the load measurement inaccuracies occurring with the widely used “swan neck” basic design.

A high quality techno-polymeric material has been adopted for the carriage of the shear box, offering excellent resistance to corrosion, wear and tear and to the chemicals often mixed with the soil specimens. Furthermore, this polymeric carriage is lightweight and easy to clean.

The digital controller reads and processes the vertical and horizontal forces and displacement readings and drives the motor accordingly for the proper automatic test execution under closed loop PID control.

Read more about Shearmatic EmS here

Source: Wykeham Farrance

Read 436 times Last modified on Friday, 09 June 2017 12:17

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