Tensile testing machines for UNI EN ISO 10319 Geosynthetics -

The importance of UNI EN ISO standards in the regulation and standardisation of industrial products is indisputable. One of the most relevant standards for geosynthetics is UNI EN ISO 10319, which defines a test method for determining the tensile properties of these materials. This standard is essential to ensure that geosynthetics used in various sectors, such as construction and civil engineering, meet the required quality and performance standards.

What is UNI EN ISO 10319?

The UNI EN ISO 10319 standard was published by the International Standards Organization (ISO) and describes a test method for measuring the tensile properties of geosynthetics. This test is essential for determining the strength and durability of materials, ensuring they can withstand mechanical stresses during their use. The standard applies to a wide range of geosynthetics, including woven and non-woven geotextiles, geocomposites, geogrids, and metallic products.

Types of Geosynthetics Covered by UNI EN ISO 10319:

UNI EN ISO 10319 covers various geosynthetics, each with specific properties and applications:

Woven Geotextiles: Made by weaving polymer threads, offering high strength and durability.
Non-Woven Geotextiles: Produced by mechanically or chemically bonding polymer fibers, known for their permeability and flexibility.
Geocomposites: Combinations of various geosynthetic materials designed to leverage the advantages of each component.
Geogrids: Mesh-structured materials that provide a combination of strength and flexibility.
Geonets: Mesh structures used for soil reinforcement and stabilization.
Geomats: Mats used for erosion protection and soil stabilization.
Metallic Products: Includes geosynthetics reinforced with metallic elements to enhance mechanical strength.

Preparing specimens for Testing

Specimen preparation is a crucial step to ensure the accuracy of test results. Specimens must be cut to specific dimensions and conditioned appropriately to simulate real-use conditions.

Dimensions and Shapes of Specimens: The standard specifies the standard dimensions of specimen to ensure result consistency.
Conditioning of specimens: Specimens must be prepared and conditioned in controlled environments to simulate operational conditions.

Test Procedure

The test procedure described in UNI EN ISO 10319 requires specific tools and equipment:

RequiredTools and Equipment: Including tensile testing machines, extensometers, and other measuring devices.
Detailed Test Steps: Includes securing the spceimen in the testing machine, applying the load, and recording tensile data.

Tensile Testing Machines

Tensile tests according to UNI EN ISO 10319 require specific machines designed to apply a controlled load to geosynthetic apecimens. Tensile testing machines are fundamental to ensuring accurate and replicable results. Here are some details on commonly used machines:

Types of Machines Used: Universal Testing Machines (UTM) are the most commonly used. These machines can apply both tensile and compressive loads and are equipped with specific accessories for geosynthetics.
Key Features: UTMs are equipped with high-precision load cells, clamps to securely fix specimens, and advanced control software for data collection and analysis.
Operation and Maintenance: It is essential that machines are regularly calibrated and maintained in good condition to ensure test accuracy. This includes verifying load cells and maintaining grips.

How to Test for UNI EN ISO 10319 with Video Extensometer

The video extensometer is an essential tool for conducting tensile tests according to ISO 10319. This device uses DIC technology to accurately measure sample deformation during the tensile test.

Overview of Video Extensometer Use: The video extensometer captures high-resolution images of the spcimen during the test, analyzing the movements of virtual markers placed on the sample to determine elongation and deformation.
Advantages of Using a Video Extensometer: Compared to traditional extensometers, the video extensometer offers non-contact measurements, eliminating the risk of influencing results. It is particularly useful for fragile spceimens or those with irregular surfaces.
Detailed Test Procedure:
- Specimen Preparation: Insert the specimen between the grips of the testing machine.
- Video Extensometer Configuration: Place the virtual marker on the video extensometer software so that it can capture the required gauge length.
- Test Execution: Start the tensile test and the video extensometer simultaneously, recording the entire process.
- Data Analysis: Use the video extensometer software to analyze the images and calculate the sample’s elongation and deformation.

Measurement of Tensile Properties

UNI EN ISO 10319 includes several key measurements to determine the tensile properties of geosynthetics:

Load Elongation: Measures the increase in sample length under load.
Secant Stiffness: Calculates the material’s resistance during elongation.
Maximum Load per Unit Width: Determines the maximum force the material can withstand per unit width.
Deformation at Maximum Load: Measures the specimens deformation at the point of maximum load.

Load-Strain Curves

Load-strain curves are essential for understanding the mechanical behavior of geosynthetics during the tensile test. These curves show the relationship between the applied load and the specimen’s strain, providing crucial data for performance analysis.

Importance of Nominal Gauge Length

The nominal gauge length is the initial distance between two reference points on the specimen. This measurement is fundamental for calculating elongation and strain during the test.

Elongation at preload

Elongation at preload is the increase in the specimen’s effective length under an applied load equal to 1% of the maximum load. This value is crucial for determining the material’s initial strength.

Maximum Tensile Force

The maximum tensile force is the highest force reached during the test. This measurement is essential for evaluating the material’s capacity to withstand high loads without breaking.

Tensile Strain

Tensile strain is the increase in the sample’s effective length during a test divided by the effective gauge length. This value provides a measure of the material’s resistance to deformation.

Secant Tensile Stiffness

Secant tensile stiffness represents the ratio between the tensile force per unit width and an associated deformation value. This measurement is fundamental for evaluating the material’s strength and stiffness under load.

Tensile Strength

Tensile strength is the maximum force per unit width measured during a test in which the sample is stretched to break. This value is crucial for determining the material’s durability and resistance under extreme conditions.

Strain Ratio

The strain ratio expresses the time from preload to maximum tensile load. This value is important for evaluating the material’s strain rate under load.

Conclusion

Tensile tests according to UNI EN ISO 10319 are essential for ensuring the quality and resistance of geosynthetics used in various industrial sectors. These tests provide crucial data for analyzing material performance, ensuring they can withstand mechanical stresses during their use. Our organization is dedicated to providing high-quality tensile testing services, using advanced technologies and expert personnel to ensure accurate and reliable results.

Discover Our Machines for Conducting Tests According to UNI EN ISO 10319

FAQ

What are the main types of geosynthetics tested according to UNI EN ISO 10319? UNI EN ISO 10319 covers woven and non-woven geotextiles, geocomposites, geogrids, geomats, membranes, and metallic products.
Why is the nominal gauge length important in tensile testing? The nominal gauge length is crucial for accurately calculating the sample’s elongation and deformation during the test.
What is preload elongation? Preload elongation is the increase in the sample’s effective length under a load equal to 1% of the maximum load, indicating the material’s initial resistance.
What is the maximum tensile force? The maximum tensile force is the highest force reached during the test, essential for evaluating the material’s resistance to high loads.
How is secant tensile stiffness measured? Secant tensile stiffness is calculated as the ratio between the tensile force per unit width and an associated deformation value, fundamental for evaluating the material’s resistance and stiffness.