2654 WordsMay 24, 201311 Pages

ME 304 – Experimental Engineering Spring 2013
Lab Report
Experiment # 3
Bending of Beams
Section # ThTh12 Group # 1
Ömer Ege Çalışkan
Serhat Karakuz
Noyan Uğur Renda
Turgut Soydan
20.03.2013
Abstract In this experiment, a simply supported beam is used and the variations of deflection of a simply supported beam with load, beam thickness and material are investigated. It is found that the deflection of the beam changes linearly with the load and as the beam thickness increases, the beam deflection decreases. In addition, since different materials have different modulus of elasticity, deflection of different materials under a specific load is different. Depending on the results of the experiment, it*…show more content…*

Since beams are used to compensate the loads within the structures, there are different types of beam loads available. For instance; there are uniform beam loads, varied beam loads by length, single point beam loads and combination beam loads which include all types of loading. [2] Sometimes beams are experienced some deflections from their equilibrium states towards a completely new state due to loads applied. The direction of the deflection highly depends on the direction of load applied. There are different beam theories postulated up to now to describe the behaviour of beams under loading. The theory that is accepted and applied for this experiment is named as Euler-Bernoulli Beam Theory. There is a requirement for this theory to be applied on a beam. Namely, the length of the beam should be at least 20 times of the thickness of it. Actually the more the ratio gets higher, the more the theory and calculations are valid. [3] There are also some assumptions made with respect to this theory. In fact, they are all related with normals of the beam itself. First assumption is that normals do not bend. Secondly, normals remain unstreched. If we take into consideration both two assumptions, it can be easily obtained the conclusion that normals remains normal. If the Euler-Bernoulli Beam Theory is applied on a beam, this means that these assumptions are done and the requirement is met.

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