The origin of Young's modulus 0.0 / 5 ? EngineeringPhysics of materialsUniversityNone Created by: OmololaS15Created on: 26-12-18 15:55 Define stiffness The resistance of a material to elastic deformation. 1 of 13 Define Young's Modlus The resistance to elastic extension and compression. 2 of 13 Define Shear Modulus The resistance to shear strain 3 of 13 What can we use Young's modulus for? To calculate deflection: ΔL =FL/AE . 4 of 13 What determines elastic behaviour? Bonding. 5 of 13 What is yield stress affected by? The microstructure of the material. 6 of 13 How is the potential energy well curve created? It arises from attractive and repulsive forces (the addition of these curves) 7 of 13 Describe the Coulomb attraction It is needed to form the bond and it is a long range force. U = -q^2/4πε_0*r . 8 of 13 Describe the Repulsive force (and thus energy) It arises due to the overlap of inner electron shells, it is a short range force. U = B/r^n . 9 of 13 Give the equation for the the force between one bond F_b= S_0 *Δr 10 of 13 Give the equation for the stress between the bonds σ=NS_0*Δr =S_0 *(Δr/r_0) ] where N = (1/r_0 *1/r_0) --> the number of bonds per area 11 of 13 Give the equation for the Young's modulus of the bond E = S_0/r_0 12 of 13 What are the consequences of a strong bond? There is a deep + narrow energy well in the U- r graph. They have a higher bond energy and stiffness. 13 of 13
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