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Gilson Pneumatic Direct Shear Machines are tabletop units manufactured in cooperation with Karol-Warner and provide direct or direct/residual shear values for evaluating the strength and stability of soils. Soil specimens are carefully trimmed into a Direct Shear Box, which is horizontally divided, allowing independent movement of the upper and lower halves. A vertical confining load is applied to the specimen and a horizontal shear force is applied to the lower half of the shear box, while the upper half remains stationary. After a direct shear failure has been measured, selected models allow the force direction to be reversed to determine residual shear values.
Pneumatic Direct Shear Machines apply vertical confining pressures to the specimen. Confining loads are applied pneumatically using a small, rolling diaphragm piston for light loads of 4–100lbf (0.018–0.44kN) and a larger diameter piston for loads up to 1,500lbf (6.67kN). This design increases the sensitivity and accuracy of the light load system. Loading is controlled using the precision regulator with an included calibration chart. Load settings are displayed digitally and are accurate to ±0.25%. Both pneumatic direct shear machines are completely self-contained and the need for loading weights is eliminated.
A stepper motor controls strain rates to ±1% from 0.0001–0.3in/min (0.0025– 7.62mm/ min) and is easily set with digital thumbwheel controls. The total shear capacity is 1,500lbf (6.67kN). The included water chamber with drainage port is constructed of Teflon coated, anodized aluminum for corrosion resistance.
HM-381 Standard Pneumatic Direct Shear Machine uses an S-Type Load Cell connected to a built-in digital display to measure and display load values. Consolidation and direct shear displacement are measured using analog dial indicators.
HM-382 Digital Pneumatic Direct Shear Machine also includes an S-Type Load Cell to measure shear load but adds Linear Variable Displacement Transducers (LVDT’s) to measure horizontal and vertical displacement and functionality to perform residual shear testing. A Four-Channel Data Readout with mini USB data output processes and displays measured values. GetData software is included to transfer data in ASCII format to common spreadsheet applications in the user’s computer using Windows XP or a newer operating system.
HM-381: 120V/50-60Hz, 0.5 Amps, 1 Watt
HM-381F: 230V/50-60Hz, 0.3 Amps, 69 Watts
HM-382: 120V/50-60Hz, 0.6 Amps, 72 Watts
HM-382F: 230V/50-60Hz, 0.4 Amps, 92 Watts
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