Poly-Axial Test System (SPAX-2000)

The Poly-Axial System includes four hydraulic load rams equipped with LVDT’s so that each platen can be independently computer-controlled. The feedback control can be either stress or strain.

The Poly-Axial System includes four hydraulic load rams equipped with LVDT’s so that each platen can be independently computer-controlled. The feedback control can be either stress or strain.With this configuration the specimen can be maintained centered minimizing end platen friction. This is accomplished by always making one of the LVDT’s on each plane with hydraulic loaders the “master” and the opposing LVDT the “slave”. The master LVDT can be controlled to deform at a particular rate, including zero, and the slave is automatically programmed to deform an equal amount.

Each one of the horizontal loading rams has an internal load cell because there can be significant end platen friction at the top and bottom porous stones, especially if the specimen exhibits significant non-homogeneity. The load cell at the bottom vertical loader is omitted because the side platens are smooth and can be lubricated making end platen friction much less an issue for this direction. Pore pressures are measured at the top and bottom specimen ends.

Stresses/strains in the axis 3 directions are applied through the chamber fluid pressure. A volume change device is used to measure and control the strains in this direction. Optional proximity sensors can also be used to measure deformations in this direction.

 

Geotechnical Consulting & Test Systems (GCTS), USA

Geotechnical Consulting & Test Systems (GCTS), USA

Geotechnical Consulting and Testing Systems (GCTS) provides advanced testing solutions for Research in Geotechnical & Pavement materials. GCTS also helps in design of laboratory and in-situ testing apparatus and software ranging from modification and adaptation of existing apparatus to the purchase of new closed-loop computer-controlled systems. The company manufactures a full line of computer-controlled testing systems with either pneumatic or hydraulic loaders. Each system comes with a versatile software package which provides test control, data acquisition, data reduction, and graphing in one easy to learn Graphical User Interface.

 

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