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Strength of Materials: Composite Beams



Composite Beams

So far all I have talked about are beams that consist of one material. However, there can be cases when a beam could consist of more the one material. In other words it would be composite beam. Now if you were start using the equations that I have in previous section without considering that the beam is made out of a composite material, you would not get the correct answer. The reason why is because each material has its own stiffness, which means the beam is going to behave differently than if it was made completely out of one material. In order to solve a problem like this the beam would have to be manipulated. One of the easiest ways to manipulate the beam is to change it so that it is made of the same material, but has the same stiffness as the composite beam. To do this you would have to take the ratio of the young's modulus of the beams; equation 1. Once you have that ratio you can then change a dimension of one of the material sections, which would in turn change the beam so that it takes in consideration of both materials. Refer to the example below.

Using Young's Modulus to calculate a composite beams stress during bending (1)

Example of a composite beam



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