Flexural modulus and elastic modulus are two important mechanical properties used to describe the behavior of materials under stress.

Flexural modulus, also known as bending modulus, measures a material's resistance to bending stress. It is particularly important for materials used in applications where bending or flexing is a common occurrence, such as in the construction of bridges or the manufacturing of furniture. The flexural modulus is typically determined through a bending test, which involves applying a load to a sample of the material and measuring the resulting deflection.

Elastic modulus, also known as Young's modulus, measures a material's ability to recover its original shape and size after being subjected to tensile or compressive stress. It is an important property for materials used in applications where they will be subjected to repeated loading and unloading, such as in the construction of buildings or the manufacturing of machinery. The elastic modulus can be measured through a tensile or compressive test, which involves applying a load to a sample of the material and measuring the resulting deformation.

Understanding the flexural modulus and elastic modulus of a material is important for ensuring its suitability for a particular application. By knowing how a material will behave under stress, engineers and designers can make informed decisions about which materials to use and how to design structures or products that will withstand the forces they will be subjected to.