Homework_1_solution - Introduction To Materials Science...

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Polyethylene Spring 2005 Homework #1 (Solution) Problem 1 A high stiffness material has a high modulus of elasticity, which is the amount that a material will stretch when a force is applied. Strong bonding will mean that a greater force is required to stretch the bond. The coefficient of thermal expansion describes how much a material expands or contracts when its temperature is changed. It is related to the strength of the atomic bonds because for the atoms to move from their equilibrium position energy should be introduced into the material. A strong bond will require more energy for a certain separation than a weaker bond; thus atoms in the strong bond will separate to a lesser degree. Thus both thermal expansion and stiffness in a material are related to the strength of the atomic bonds, such that high strength bonds increases stiffness and decreases thermal expansion. Problem 2 Mechanical properties: The material should have high strength to resist the forces acting on the wing. The wing should also resist vibrations. Suggesting that fatigue properties are important. In supersonic
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Homework_1_solution - Introduction To Materials Science...

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