Large-Scale Deformation Device (DEF-S1600)

The DEF-S1600 deformation device is composed of two, three, or four DEF-S1610 Axial Deformation Gages and one or two DEF SRCP 600 circumferential deformation gages.

The DEF-S1600 deformation device is composed of two, three, or four DEF-S1610 Axial Deformation Gages and one or two DEF SRCP 600 circumferential deformation gages.

Each DEF-S1610 includes one LVDT holder with a 150 mm radius, one rod extension holder with the same radius, and one rod extension for measuring the axial strains. This device measures the axial strains within the middle halve of the specimen height (from the upper 1/4 to the lower 1/4 of the specimen height) away from the platen end effects. Holders are attached to the specimen using tension springs. The two holders are guided by a precision bearing and light shaft to maintain parallelism, eliminating block rotation errors.

Different size extension rods can be purchased from GCTS to measure axial deformation over different gage lengths.

Several DEF-S1610 devices can be installed in one specimen to measure the average axial deformation. A minimum of two DEF-S1610 located at 180 degrees from each other should be used. Using more than 4 such device will become impractical.

The GCTS DEF-SRCP-600 is a device for measuring the circumferential change in a cylindrical specimen inside the triaxial cell. Radial strain can then be calculated from the circumferential deformation.

The standard DEF-SRCP-600 device includes a 10 mm (0.4 inch) range water-submersible LVDT. This LVDT can be positioned in three different locations to provide three different deformation ranges using the same LVDT. The smallest range with the best resolution is achieved by mounting the LVDT holder and target holder right on the chain end blocks. In the same way, the largest range can be achieved by setting the LVDT and target holders at the bottom of the “V” arms. These 3 different mechanical ranges translate roughly to 10%, 2.5% and 1% radial strain ranges on a 300-mm diameter specimen.

 

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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