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Tensile test
Stretch at a constant speed along the longitudinal axis of the specimen until fracture or stress (load) or strain (elongation) reaches a predetermined value, and measure the load and elongation that the specimen bears during this process
Tensile testing is a commonly used method for determining the mechanical properties of materials under tensile load. Measure the mechanical performance indicators of the specimen, such as tensile strength, yield strength, elongation at break, etc., by stretching at a constant speed along the longitudinal axis of the specimen at fracture or reaching a predetermined stress (load) or strain (elongation). The following is a detailed explanation of the tensile test:
Test Principle
The tensile test is based on the following principles:
Fix the sample in the upper and lower fixtures of the tensile testing machine.
Apply tensile force along the longitudinal axis of the specimen at a constant speed.
Record the load and elongation data of the specimen during the stretching process until the specimen fractures or reaches the predetermined value.
By analyzing the load elongation curve, calculate the performance indicators such as tensile strength, yield strength, and elastic modulus of the material.
Test equipment
Universal material testing machine:
Used to apply tensile force and measure load and elongation.
The testing machine needs to be equipped with a stretching fixture.
Stretching fixture:
Including upper and lower fixtures for fixing the specimen.
The type of fixture can be selected according to the shape of the sample (such as wedge-shaped fixture, threaded fixture, etc.).
Sample:
The standard specimen shape is usually dumbbell shaped or rectangular, and the specific size is determined according to the standard or material type.
The surface of the sample should be flat and free of defects.
Measurement system:
Used to record load and elongation data, generate load elongation curves.
An extensometer can be equipped to accurately measure the deformation of the specimen.
Test steps
Prepare the sample:
Prepare the sample according to the standard requirements and ensure that the sample size meets the specifications.
Measure the width and thickness of the sample to the nearest 0.02mm.
Installation sample:
Fix the sample in the upper and lower fixtures, ensuring that the sample is aligned with the fixture.
Adjust the spacing between fixtures to ensure that the sample is in its natural state.
Set experimental parameters:
Set the stretching speed, usually 1-10mm/min, depending on the standard or material type.
Set the conditions for stopping the experiment (such as sample fracture or elongation reaching the predetermined value).
Start the experiment:
Start the testing machine and apply tensile force at a constant speed.
Record load and elongation data, generate load elongation curve.
End of experiment:
Stop the test when the sample fractures or elongates to the predetermined value.
Take out the sample and observe the fracture mode.
Data analysis:
Calculate performance indicators such as tensile strength, yield strength, and elongation at break based on the load elongation curve.
calculation formula
Test Standard
The standards for tensile testing vary depending on the material and application field, and common standards include:
ISO 527: Tensile testing for plastic materials.
ASTM D638: Used for testing the tensile properties of plastic materials.
GB/T 1040: Chinese National Standard, used for testing the tensile properties of plastic materials.
ASTM E8/E8M: Used for testing the tensile properties of metallic materials.
result evaluation
Tensile strength:
Indicate the maximum load-bearing capacity of the material under tensile load.
yield strength:
The stress at which the material begins to undergo plastic deformation.
Fracture elongation:
Indicates the plastic deformation ability of the material before fracture.
Elastic modulus:
Indicate the stiffness of the material during the elastic deformation stage.
Precautions
Sample preparation:
Ensure that the sample size and surface quality meet the standard requirements.
Equipment calibration:
Regularly calibrate testing machines and measurement systems to ensure measurement accuracy.
Environmental conditions:
The experiment should be conducted under standard environmental conditions (temperature 23 ± 2 ° C, relative humidity 50 ± 5%).
Multiple experiments:
Each sample should be tested at least 5 times, and the average value should be taken as the final result.
application
Tensile testing is widely used in the following fields:
Plastic industry: Evaluating the tensile properties of plastic materials.
Metal industry: Testing the tensile strength and plasticity of metal materials.
Composite materials: Evaluate the tensile properties of composite materials.
Quality control: Check whether the product meets the tensile performance requirements.
Through tensile testing, the mechanical properties of materials under tensile load can be comprehensively evaluated, providing important basis for material selection, process optimization, and quality control.
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