The electronic universal geotextile testing machine is a specialized testing system based on the electronic universal testing machine, designed for the characteristics of geosynthetic materials such as wide width, high strength, and easy sample slippage. Its core function is to apply static or low-speed dynamic loads such as tension, compression, bending, shear, bursting, tearing, etc. to geotextile specimens under computer control, and accurately measure their mechanical performance response.
Main testing items
1. Wide strip tensile test: This is the most important test used to determine the tensile strength, elongation at maximum load, and secant modulus of geotextiles in both longitudinal and transverse directions. Special wide bar fixtures (usually 200mm or wider) are required.
2. Sample grabbing tensile test: The width of the sample is smaller than the width of the fixture, used for rapid evaluation.
3. CBR bursting test: Simulate the ability of geotextile to resist concentrated loads (such as stones) bursting.
4. Trapezoidal tear test: Evaluate the ability of geotextiles to resist tear propagation.
5. Puncture test: Simulate the strength when pierced by a sharp object.
6. Strip tensile test: mainly used for geogrids to determine their node strength and strip strength.
7. Grip tensile test: Evaluate the strength in a localized grip state.
8. Seam/Suture Strength Test: Test the strength of the geotextile connection area.
9. Peel strength test (only for composite materials): Evaluate the adhesive strength between each layer.
Main components of the equipment
1. Host frame: usually a single or double column structure, providing high rigidity and stability. Equipped with precision ball screws, driven by servo motors, to achieve smooth movement of the crossbeam.
2. Force sensor: The core measuring component has a wide range coverage (from several hundred newtons to several hundred kilonewtons) and high accuracy (usually at level 0.5).
3. Special fixture: This is the key to the geotextile testing machine. There are many types:
Wide bar stretching fixture: Pneumatic or manual flat push jaw to ensure uniform force on the sample, prevent slipping and jaw breakage.
Piercing and piercing fixtures: circular fixtures and top rods that meet standard geometric dimensions.
Tear fixture: trapezoidal template fixture.
Special fixture for geogrid: a fixture with pin rods used to fix grid nodes.
4. Elongation measuring device:
Large deformation extensometer: used for precise measurement of specimen elongation in wide bar tensile tests, with a large range (up to 500mm or more).
Non contact video extensometer: a modern high-end configuration that tracks the marked points on the sample through a camera for non-contact measurement, especially suitable for materials that are easily affected.
5. Control system: A digital controller based on microprocessors, responsible for controlling the test speed, mode (force control, displacement control, strain control), and data acquisition.
6. Computers and professional software:
Control the experimental process.
Real time display of the "force displacement/time/strain" curve.
Automatically calculate all standard required parameters (peak force, fracture force, elongation, modulus, etc.).
Generate test reports that meet the standards, and the data can be exported.
The software is equipped with commonly used testing standards (such as GB/T, ASTM, ISO, JTG, etc.).
CH
EN
