Flexural Modulus

Last Updated: May 14, 2017

Definition - What does Flexural Modulus mean?

Flexural modulus is a measure of a material’s tendency to bend. It is generally measured using a 3-point bend test. Flexural refers to bending, and a modulus is a constant factor or ratio with an absolute value. The results are calculated using commonly accepted formulas. Such tests are used to determine the stiffness of composite material and its suitability for use in construction.

Also termed bending modulus.

Trenchlesspedia explains Flexural Modulus

Materials move, bend and change shape. Construction materials must meet demanding specifications so that these changes are appropriate with regard to function. Composite materials can be made stiffer when required by adding the right ingredients.

Flexural modulus is a mechanical term that is a measure of the ratio of stress to strain of a beam of material when force is applied. Normally flexural and tensile strength would be the same in materials of uniform composition. But there may be some variations in composite material. A higher flexural modulus would mean that the material is stiffer.

Testing for flexural strength is accomplished using a 3-point setup which involves two end point supports beneath a beam of material while force is applied on the center of the beam from above. The slope of the resulting curve determines the flexural modulus.

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