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Multi-Directional Simple Shear Test System ( MDSS )

Multidirectional excitation, chamber pressure control, direct pore pressure measurement with shear and strain controlled testing.

The CRT-MDSS is a Multi-Directional Simple Shear (MDSS) Test System (also known as earthquake simulation machine) designed in partnership with Texas A&M University, USA, and Cambridge University, UK. The CRT-MDSS is capable of applying multi-directional loading to hydraulically saturated soils, clays and other unbound materials under confined conditions simulating those found in-situ.

Controlled using the state of the art cDAC data acquisition and control system alongside our flagship Dimension software, with 3 independent loading axes and a confining pressure system the CRT-MDSS combines ultimate flexibility with complete ease of use for this most demanding area of materials testing.

The CRT-MDSS is designed primarily to test cylindrical samples of up to 100mm diameter but specimens of up to 150mm diameter can be tested with special endcaps. A hydraulic vertical actuator coupled with a hydraulic horizontal x-y table, provide the loading for the specimen. LVDTs provide position feedback, and load cells provide load feedback on all three axes allowing the system to be used in both position and load control or any combination of these. During testing a 6 axis (3 Force, 3 Torque) load cell which is installed directly above the specimen is used to measure the loading experienced by the specimen.

Samples can be tested dry or saturated and subjected to monotonic, unidirectional cyclic, and multidirectional loading. The Dimension software is easily configured to enable the MDSS to perform complex loading paths, such as figure-eight, circular and user defined patterns to a cylindrical specimen over a large range of shear stresses.

The CRT-MDSS Multi-Directional Simple Shear Test System incorporates a large pressure cell which is used to apply confining pressure to membrane encapsulated specimen. Water lines are included and connect directly to the specimen endcaps to allow the specimen to be saturated. A backpressure control system is used to control the pressure in the water lines. Excess pore pressure is also measured to allow the shearing phase of testing to be monitored, which enables, specimens to be subjected to conditions that closely simulate real world situations.

 

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