It is important to note that flexural modulus is a useful measure for materials that do not break or rupture upon the applied stress. Decreasing particle size of a mineral additive may increase flexural modulus if the particle size aspect ratio increases during the particle size reduction. Higher aspect ratio particles increase the flexural modulus of a material more so than lower aspect ratio particles. The ability for a mineral filler to modulate the flexural modulus is also dependent on the aspect ratio and particle size of the filler. Typically, adding these fine mineral fillers will increase the flexural modulus and stiffen the material. One way to modulate the flexibility is to add a fine mineral filler, such as talc powder to the plastic. For example, in plastics, the type of polymer, molecular weight, thickness and shape all play a role in the flexibility. The base flexural modulus of a base material is determined by the fundamental properties of the material.
As such, there are a few factors that modulate the flexural modulus of a material and understanding these factors aids in material development and choice. Certain material applications may need strength and rigidity for structural support, while other applications may require flexibility in order to prevent damage during bending. With these parameters, the flexural modulus, E bend, is calculated as units of force per area as follows:įlexural modulus is an important calculation for engineers and architects as it relates to the amount of weight a material can handle when used as a structural support.įlexural modulus is important in understanding the rigidity or stiffness of a material. properties of lipstick cantilever bending test and spaghetti flexure test. A force, F, is applied on a point on the opposite side and in-between the two supports, which creates a displacement in the material called the deflection, d. STIFFNESS is associated with a material that cannot easily be bent and. A parameter L specifies the length between two support points placed on the bottom of the beam. It is fundamentally equivalent to the elastic modulus of a material, which is a measure of a material’s elasticity, but the two properties commonly hold different values, particularly in polymeric materials.įlexural modulus is tested from a 3-point analysis on a rectangular beam of the material, with width w and height h. In mechanical terms, it is the ratio of stress to strain during a flexural deformation, or bending. The flexural modulus of a material is a physical property denoting the ability for that material to bend.
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