ShearTrac III Large Shear Frame

ShearTrac III

Large Shear Frame

The ShearTrac III system can perform the consolidation and shearing phases (static or cyclic) on large size samples under fully automatic control. It is an intelligent shear and load frame combination allowing both vertical and horizontal load and displacement applications. The system incorporates high load capacity motor systems (micro-stepper or servo) that offer superior precision and repeatability.

With its high load capacity, broad range of testing flexibility, and overall ease of use the ShearTrac III is the preferred large shear machine on the market.

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Description

The ShearTrac III has two main configurations:

Dual micro-stepper motors (H/V) to perform static/monotonic shear testing in a 305 x 305 x 205 mm (12 x 12 x 8 in) shear box for soils/aggregate, rock, and geosynthetics (geomembrane, geotextile, GCL, geogrid, etc.). It can also be used for determining the interface frictional properties of soil and geosynthetics and internal friction of GCLs. With additional hardware added direct simple shear is performed on 305 mm (12 in) diameter samples using a Teflon-coated ring stack.

Servo motor (H) and micro-stepper motor (V) to perform static and cyclic shear testing on 305 mm (12 in) diameter samples using a Teflon-coated ring stack. With additional hardware added shear box testing can be performed.

Features & Benefits

Built-in Safety Features

Over-load and over-travel protections to prevent system damage

Control Flexibility

Stress (load) or strain (displacement) control

Automated or Manual Control

Fully automated via computer or standalone capability via front panel display and keypad for system control and data collection

Precision Mechanics

Micro-stepper, electronic motor systems offer precise loading and shearing

Superior Reliability

More accurate, reliable, and easier to maintain than units requiring hydraulics or air pressure

Versatile Testing Applications

Test soil, aggregate, rock, and geosynthetics (geomembrane, geotextile, GCL, geogrid, etc.), as well as the interface frictional properties of soil and geosynthetics and internal frictions of GCLs

Specifications

Load Capacity

45 kN (10 klbf) vertical / 45 kN (10 klbf) horizontal
90 kN (20 klbf) vertical / 90 kN (20 klbf) horizontal

Vertical/Horizontal Motors

Micro-stepper and servo systems with built-in controls

Rate of Displacement (Speed)

0.00003 to 7.5 mm per min (0.000001 to 0.3 in per min)

Cyclic Rate

Up to 5 Hz; Typical test range 0.033 to 2 Hz

Vertical Travel

90 mm (3.5 in) resolved to 0.002 mm (0.00008 in)

Horizontal Travel

+/- 90 mm (3.5 in) resolved to 0.002 mm (0.00008 in)

Dimensions

610 x 1194 x 1168 mm (24 x 47 x 46 in)

Weight

311 kg (685 lbs)

Power

110/220 V, 50/60 Hz, 1 phase (static/monotonic)
120/208 V, 3 phase (cyclic)

Accessories

Reduced sample size inserts – 152 mm (6 in) or 205 mm (8 in)
Gripping plates for geosynthetics
Direct simple shear hardware
Rock shear rings and jig set

Warranty

12 month warranty; extended warranties available

Testing Capabilities

Direct shear on soil and aggregates
Static and cyclic direct simple shear on soil and aggregates
Interface frictional properties of soil & geosynthetics
Internal friction of GCL
Rock shear
1-D incremental consolidation up to 32 steps
Constant volume swell
Constant stress swell (free swell)