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TL;DR: If the tensile strength for the other material is greater, then the material behaves better and you can use longer and thinner planks. Assumptions For the sake of simplicity, I will assume that : the breadth of the plank $b$ is a constant for both cases, and only the thickness $h$ and the distance between supports $L$ is changing. the load is a ...


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Assume simply supported beam stressed to the ultimate state (plastic hinge has formed in the midspan), and deflection is not a concern. Let $b =$ block width $(mm)$, $h =$ block thickness $(mm)$, $\rho=$ bulk density of the material $(kg_f/mm^3)$. $w =$ uniformly distributed weight of the block $= \rho bh$ $M = \dfrac {PL}{4} + \dfrac {wL^2}{8} = \dfrac{2PL+...


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