The allowable stress is the value of stress beyond which stress should not be applied for safety reasons. Units = N/mm 2 Allowable bending stress formula The formula in terms of units of each quantity can be given as-įrom above, we can derive that the units of bending stress is. The formula of bending stress can be given as. M is the bending moment Bending stress formula units I is the moment of inertia of cross section Mathematically, it can be represented as. The bending stress depends on the bending moment moment of inertia of cross section and the distance from the neutral axis where the load is applied. Most commonly used beams in industry are cantilever beams, simply supported beams and continuous beams. The beam is not necessarily a support, it can itself be a structure for example bridges and balconies. What is a beam?Ī beam is a structural element that is mainly used for supporting the primary structure. In further sections we shall see the mathematical forms of bending stress for various beam configurations and cross sectional shapes. It is simply the stress which is responsible for bending of the work piece. Let us start our discussion with the definition of bending stress. The bending strength of the material is the maximum amount of bending strength that can be applied on the work piece before the work piece starts to fracture. The work piece will break if the applied bending stress exceeds more than the maximum allowable bending stress. It is very important to know the amount of bending stress being experienced by the work piece. We all know that when an object curves due to application of load then it is said to be subjected under bending. This article discusses about bending stress formula for different types of beam configurations.
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