What is Shear Testing?

Thursday, October 29, 2015

Shear is defined as the external force acting on an object or surface parallel to the slope or plane in which it lies. Shear strength is the stress required to yield of fracture the material in its cross-section. Some common examples of shearing include punching shapes from a material, cutting a piece of paper or even simply using a cookie cutter. While there are many common applications affected by the shear strength of a material, in extreme cases – such as manufacturing – it is important to know the shear properties of the materials at hand in order to prevent failures.

Shear testing is very important quality function; however, it depends on the type of material used. Most commonly tested are materials that are considered anisotropic or have been cold rolled. These materials have varying material properties in specific directions, making it extremely important to test for shear properties. Shear characteristics are also important when characterizing the structural integrity of the bond between two surfaces, such as a weld or adhesives bond.

There are a variety of factors that may affect the shear properties of a material. For metals, things like grain size, cold work, impurities or contaminants, and microstructure can affect shear strength. Plastics, however, will depend on the chemical makeup and crystallization. Composite materials may vary in shear properties depending on the volume of each constituent and their structure. Finally, for all materials, shear properties will vary depending on the temperature of the application.

With the ever-evolving industry relying on composites and bonded materials the need for reliable and accurate shear testing is increasing. When parts or production processes are subjected to shear forces or stresses quality control programs should include shear testing.

Contact us today for more information on how shear testing can benefit you and your production process.



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