Geosynthetic direct shear drawing friction tester

Whats/App: +86 156 1874 6768

Web: standard-groups.com

Specification

For direct shear test, adopt detachable drive unit, which can be moved from one shear box to another, allowing the testing of one sample while another sample is being prepared in a separate box.

For pullout test, the box is removable of a constant rate controlled by the servo motor; it is as same as moving box in direct shear test.

The direct shear test machine consists of servo motor, load cell, control panel, transducer, readouts for the sensors, etc.

The drive system is mounted on a wheeled frame to allow for easy separation from the sample box.

The box has low friction linear bearings when moving.

Digital readout for each test and can be connected to PC for data analysis.

Application

The geosynthetic materials direct shear and pull-out friction testing system is primarily used to test the pull-out friction resistance between geosynthetic materials (such as geotextiles, geomembranes, geogrids, etc.) and the surrounding soil, as well as the friction characteristics of these materials under direct shear conditions.

Material performance evaluation: It tests the friction and pull-out performance of geosynthetic materials under specific conditions to evaluate their stability and durability in practical applications.

Engineering material selection: It allows for the comparison of the friction and pull-out performance of different geosynthetic materials to select the most suitable material for engineering needs.

New material development: In the development of new geosynthetic materials, this system can serve as an important tool for performance evaluation, helping researchers optimize material formulations and processes.

Standard

Direct shear test:

IS0 12957.1:Geosynthetics - Determination of friction characteristics - Part 1: Direct shear test

GB/T 17635.1-1998:Geotextiles and geotextile-related products - Determination of friction characteristics - Part 1: Direct shear test

JTG E50 T1129:Test method for direct shear friction of geosynthetics in highway engineering (corresponding to JTG E50 T1129)

SL/T 235:Specification for test and measurement of geosynthetics

ASTMD 5321:Standard Test Method for Determining the Coefficient of Soil and Geosynthetic or Geosynthetic and Geosynthetic Friction by the Direct Shear Method

Pull test :

JTG E50 T1130:Test method for pull-out resistance of geosynthetics in highway engineering (corresponding to JTG E50 T1130)

Features

Direct shear drawing test system is an integrated machine with two functions of direct cutting and drawing, as long as by changing a small amount of tooling fixtures, two test functions can be achieved:

Computer upper computer software controls the test process, direct shear and drawing interface friction integration into one, software autonomy is strong, can independently set the experimental conditions of mainstream standards at home and abroad, applicable to mainstream national standards, and can independently complete data processing, to achieve full data export, easy to study the relationship between shear stress and displacement of samples and time, is a comprehensive interface friction test system;

The horizontal loading device adopts servo electric cylinder to realize full digital speed closed-loop control, which has the advantages of stable speed, wide speed range and high positioning accuracy, and the stretching speed can be set arbitrarily.

The normal loading device is realized by manual hydraulic or automatic electric cylinder, which is convenient and reliable, and the pressure is stable. The pin connection technology can quickly and simply change the clamp required for testing;

It has a variety of hardware and software protection measures such as overload and over-travel to ensure the safe and reliable operation of the equipment.

Parameters

Description	Details
Shear box sizes	300 x 300 x 200mm; 600 x 600 x 300mm; 600 x 600 x 300mm Under the shear box: 300 x 300 x 200mm; 800 x 600 x 300mm; 800 x 600 x 300mm
Drawing box sizes	300 x 300 x 340mm; 600 x 400 x 500mm; 600 x 400 x 500mm
Loading mode	Servo cylinder loading; Hydraulic loading; Hydraulic loading
Normal pressure	0 - 250kPa; 50 - 300kPa (customizable)
Static load	50 - 400kPa
Dynamic load	50 - 300kPa
Horizontal drive mode	Servo cylinder; Servo motor; Hydraulic drive
Maximum horizontal force	30kN; 50kN; 100kN
Horizontal load accuracy	0.50%
Straight shear drawing speed	0.1 - 10mm/min; 0.1 - 10mm/min; 0.3 - 10mm/min
Direct shear displacement	0 - 100mm
Drawing displacement	0 - 150mm
Displacement resolution	0.01mm
Return speed	1 - 50mm/min
Power supply	AC220V 50Hz
Overall dimensions	2400 * 700 * 2000mm; 2900 * 850 * 3400mm; 1500 * 900 * 1800mm

Accessoriess

Shear box

Vertical loading device

Horizontal loading device

Tensile and compressive force sensor

Displacement sensor, etc.

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