Thermal Expansion Testing

The propensity of matter to modify its shape, area, and volume in reaction to a change in temperature is known as thermal expansion. Coefficients of linear Thermal Expansion (CTE) are required for design purposes and are used, for example, to determine dimensional behavior of structures subject to temperature changes, or when a solid object made of different materials is exposed to a temperature change, it may experience thermal stresses that lead to failure. ... Read More

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    Thermal Expansion Testing

    When a material’s molecule’s kinetic energy rises, thermal expansion happens. The molecules are able to maintain a bigger separation due to their increased mobility. The percentage increase in strain per unit change in temperature is known as the Coefficient of Thermal Expansion (CTE).  It can be specified over a wide temperature range or at a specific temperature.

    The coefficient of thermal expansion can be calculated by measuring the displacement and temperature of the specimen. This measurement can be done through a dilatometer, interferometer, or through thermomechanical analysis. Optical imaging is used for higher temperatures. CTE increases with an increase in temperature. 

    Common Uses of Thermal Expansion Testing

    • Detecting design flaws.
    • Failure analysis of products. 

    Limitations of Thermal Expansion Testing

    • The value of the coefficient of thermal expansion holds good only if the material is isotropic. 

    Industrial Application of Thermal Expansion Testing

    • Metallurgy
    • Automotive
    • Aerospace

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