The International Information Center for Geotechnical Engineers

Tuesday, 09 January 2018 13:50

Gilson makes the difference with the self-contained Digital Pneumatic Shear Machine

The HM-382 Digital Pneumatic Shear Machine by Gilson is a self-contained unit for evaluating direct and residual shear strength of soil specimens.

This model features Karol-Warner's highly accurate CONBEL™ pneumatic loading system to apply vertical confining pressures to specimens.

The test is performed on a variety of soil types with either undisturbed or remolded samples. Specimens are carefully trimmed into a Direct Shear Box, which is split to allow individual 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 shear failure has been measured, the force direction is reversed to determine residual shear values.

Models have a load cell with digital readout for shear load measurement, and horizontal and vertical displacement transducers to measure consolidation and shear displacement. Total shear capacity is 1,500lbf (6.67kN).

Confining loads are controlled through a precision regulator with included calibration chart, and the digitally displayed settings are accurate to ±0.25%. A stepper motor drive controls horizontal strain rates to ±1% from 0.0001—0.3in/min (0.0025—7.62mm/ min), and is easily set with digital thumbwheels. HMA-735, 2.5in (63.5mm) diameter stainless steel shear ring, porous stones, drainage plates and a water chamber constructed of Teflon coated, anodized aluminum for corrosion resistance are included. Unit requires 90psi (6.2bar) user-supplied compressed air source.

Click here to read more about the specifications of Digital Pneumatic Shear Machine.

Source: Gilson

Read 454 times Last modified on Tuesday, 09 January 2018 13:59

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