11 Oct 2026
4 min read
1. Confirm specimen identity and the applicable test method
Check the material, specimen ID, sampling location and orientation against the work order before mounting. Confirm the required method and its instructions for specimen geometry, test speed and reported properties; requirements differ by material and application. Record the method and any deviations so the tensile test results can be traced to the right sample.
2. Measure the specimen before mounting it
Measure and record the dimensions required by the method, such as width, thickness and gauge length. Use suitable measuring equipment and take care not to deform the specimen. Because tensile stress is calculated using the original cross-sectional area, inaccurate dimensions can distort the reported result even when the tensile testing apparatus records the load correctly.
3. Align the specimen and secure it in the grips
Center the specimen along the tensile tester’s loading axis, then tighten the grips enough to prevent slipping without crushing or damaging the sample. Confirm that the gauge section is positioned correctly and that the specimen is not visibly twisted or bent. Poor alignment can introduce bending and make a tensile stress test less representative of the material.
4. Set test speed and extensometer use before loading
Set the test speed specified by the applicable method; do not rely on a default without checking it. If using an extensometer, fit and zero it as instructed, position it over the gauge length, and confirm its measuring range suits the expected strain. Incorrect setup can produce misleading strain data even if the tensile tester records load.
5. Run the test and watch for equipment or operator errors
Start the test using the method’s sequence and observe the specimen, grips and displayed signals. Stop and investigate unexpected grip slip, abnormal movement, interruptions or unstable load and strain readings rather than treating them as normal results. Keep clear of moving parts and follow laboratory safety procedures throughout the tensile test.
6. Review the results and complete a traceable report
Review the load-extension curve and calculated properties for irregularities, then check that the correct dimensions and method were used. Report the specimen ID, material, orientation, dimensions, setup, test speed, results and any deviations. Save the software report and relevant test records so another reviewer can understand how the tensile stress test was performed.
Tensile Testing FAQs
What is UTM in tensile test?
UTM means Universal Testing Machine. In a tensile test, it applies a controlled pulling force to a specimen while the system records load and, when configured, extension or strain.
What is the ASTM standard for tensile testing?
There is no single ASTM standard for every material; the applicable method depends on the material and specimen. Select the standard that matches the sample and follow its current requirements.
What machine is used for a tensile test?
A Universal Testing Machine or tensile testing machine is commonly used, with suitable grips and measurement equipment. Its capacity and configuration should match the material, specimen and test method.
Who is the manufacturer of tensile testing machines in India?
Akuracy manufactures and exports material testing equipment, including a Computerized Universal Testing Machine. When assessing any manufacturer, verify the agreed specification, calibration arrangements, installation, training and after-sales support.
How many specimens should be tested for a representative result?
Use the number of specimens required by the governing method or product specification. If neither sets a requirement, document the laboratory’s sampling rationale and consider material variability before drawing conclusions from a single result.
Can tensile testing be performed at elevated temperatures?
Yes. Elevated-temperature testing can be performed with appropriate temperature-control equipment and a method that defines the required conditions. Confirm that the specimen, grips and strain-measurement setup suit the test temperature.
What is the difference between engineering stress and true stress?
Engineering stress uses the original cross-sectional area; true stress uses the changing area during deformation. The reported value depends on the measurement method and the property required by the applicable test method.
How can a laboratory compare tensile results from different testing machines?
Use the same method, specimen preparation, dimensions, alignment, speed and result definitions, and confirm calibration status for both machines. Compare the underlying records as well as the reported values, noting any differences in setup.
When should a laboratory use a video extensometer instead of a contact extensometer?
A video extensometer may be suitable when non-contact strain measurement is needed, such as when contact could disturb the specimen or measurement. Check the method’s requirements and the instrument’s measurement range before choosing.
Use a consistent procedure to improve tensile test repeatability
Document the method and setup, train operators to follow the same sequence, and maintain calibration and service records for the tensile testing apparatus. For broader equipment and support information, see Akuracy’s material testing equipment, including its Computerized Universal Testing Machine and calibration and repair support. Before testing, confirm that the machine configuration, grips and reporting workflow fit the laboratory’s method.
Raghav Menon writes about material testing, hardness measurement, balancing equipment, and laboratory quality control for manufacturing teams in India. His background includes reviewing test methods, calibration requirements, machine specifications, and service considerations such as spare parts, operator training, and repair response time. He focuses on evidence-based comparisons that distinguish rated capability from practical performance, including suitability for standards such as IS 1608 Grade 1. His articles are structured for engineers and quality managers who need clear guidance on equipment fit, operating limits, lifecycle cost, and supplier support.