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Knowledgebase

Elongation Testing

Get to grips with elongation testing

Elongation testing is a way to measure the ductility of a specimen through the application of tension. It is a very useful way of working out the plasticity of a material and can help you understand the ways it might behave when subjected to pressure. Want a better understanding of how elongation testing might fit into your process? We’ve got details on everything you need to know.

How elongation testing works

Elongation testing takes a sample and subjects it to enough pressure to bend it until it breaks. It then measures the degree to which the sample has stretched, without returning to its original shape, after breaking. This is known as the specimen’s plastic deformation.

The result is typically normally expressed as a percentage, also known as percent elongation (% elongation).

How to calculate percent elongation

It’s important you know your gauge length to carry out critical and accurate elongation calculations. This consists of two measurement points: the first is the starting distance between the upper and lower grip edges; the second is the distance travelled by the grips when the sample breaks. Elongation is calculated by dividing the distance travelled by the original gauge length.

Our highly accurate testing devices offer insightful information on how far a sample will stretch before breakage, including our efficient and accurate UTM machines

Check out how a UTM could work in your setup

Have a look at this short video guide to UTM machines from United Testing for an idea of how elongations testing could easily be added to your test and inspect solution.

Elongation testing that meets industry standards

Many standards require you to measure elongation and no matter which industry you’re working in, we can help you get the accurate measurements you need. Our reliable testing equipment will make sure you enjoy consistent, repeatable results to meet or exceed all of the main testing standards, including:

ASTM A36 / A36M – 14  – Standard Specification for Carbon Structural Steel
ASTM A370 – 17a  – Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A500 / A500M – 18  – Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
ASTM A931-08(2013) Standard Test Method for Tension Testing of Wire Ropes and Strand
ASTM D1456 – 86(2014)  – Standard Test Method for Rubber Property—Elongation at Specific Stress
ASTM D3759 / D3759M – 05(2011)  – Standard Test Method for Breaking Strength and Elongation of Pressure-Sensitive Tape
ASTM D412 – 16  – Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension
ASTM D4595-17 – Standard Test Method for Tensile Properties of Geotextiles by the Wide-Width Strip Method
ASTM D4632/D4632M-15a – Standard Test Method for Grab Breaking Load and Elongation of Geotextiles
ASTM D5035-11(2015) – Standard Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)
ASTM D5083 – 17 – Standard Test Method for Tensile Properties of Reinforced Thermosetting Plastics Using Straight-Sided Specimens
ASTM D638 – 14 – Standard Test Method for Tensile Properties of Plastics
ASTM D882 – 12  – Standard Test Method for Tensile Properties of Thin Plastic Sheeting
ASTM E8 / E8M – 16a  – Standard Test Methods for Tension Testing of Metallic Materials
B557-15 – Standard Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products

Get your elongation testing set up with Industrial Physics

Industrial Physics’ companies have been in the testing game for a long time, and we’ve learnt a great deal about elongation testing over the years – now we’re happy to be able to pass that knowledge on to you. If you’re looking for help setting up a QA process or adding elongation testing to your current roster, we can help. Visit our product area to browse through our vast range of testing solutions!