A Guide to Elongation at Break & Tensile Strength

Posted on: 11th Oct 2018

PolyGlobal, a bespoke engineering company specialising in the injection and cast moulding of engineering plastics, design and manufacture solutions that are utilised in a diverse range of industries across the world. Each solution has its own specific requirements in order to operate effectively in widely varying environments and conditions.

The technical and mechanical properties and performance of engineering plastics are crucial considerations in the material selection process. Material testing provides an insight into how the mechanical properties of a material can be affected under different stresses and pressures

.Photo of raw material for moulding

Tensile Testing

Tensile testing of materials provides information about the strength and ductility of a material. It is a destructive test process that demonstrates how much force a material can withstand before failure.
Two key measurements determined from tensile testing are Elongation at Break and Tensile Strength:

Elongation at Break

Elongation at break is the measure of a materials ductility. This measurement shows how much a material can be stretched, as a percentage of its original dimensions, before it breaks. It indicates the ability of a material to undergo significant deformation before failure.

Materials with a higher elongation at break percentage have higher ductility.

High ductility indicates that a material will be more likely to deform and not break, whereas low ductility indicates that a material is brittle and will fracture before deforming much under a tensile load.
The ductility of a material depends largely on its chemical composition and is a key consideration particularly when selecting materials subjected to extreme cold.

Photo of material sample being tested for strength

Tensile Strength

The tensile strength of a material is the maximum amount of tensile (pulling) stress that it can take before failure, such as breaking or permanent deformation.

When stresses less than the tensile strength are removed a material will return either completely or partially to its original shape and size. As the stress reaches or passes the tensile strength point, the integrity of the material is compromised and fractures can occur.

Tensile strength is commonly measured in units of pounds per square inch (psi)

PolyGlobal understand the everchanging demands of the markets they supply into and the increasing need for product testing.

They are set to launch a partnership with Bradford University’s Polymer Interdisciplinary Research Centre to undertake a series of material testing projects. This developing collaboration will enable PolyGlobal to provide both existing and new customers with enhanced technical and product performance data.

PolyGlobal already have a number of Material Technical Data Sheets on their website

For more information or help with any enquiries please contact PolyGlobal via marketing@polyglobal.co.uk

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