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MAE 20 Homework_1_SOLUTIONS_summer_2008

MAE 20 Homework_1_SOLUTIONS_summer_2008 - MAE 20 Summer...

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1 MAE 20: Summer, 2008 Homework 1 (Solutions) (a) No! Springs are intended to resist high elastic forces, where only the atomic bonds are stretched when the force is applied. Generally, ceramics would satisfy this requirement. However, we would like to also have good resistance to impact and at least some ductility (in case the spring is overloaded) to assure that the spring will not fail catastrophically. We also would like to be sure that all springs will perform satisfactorily. Ceramic materials such as silicon nitride have virtually no ductility, poor impact properties, and often are difficult to manufacture without introducing at least some small flaws that cause to tail even for relatively low forces. (b) In order to produce an aluminum-matrix composite material with a density of 1.7 g/cm 3 , we would need to add a material to the Aluminum having a density considerably less than 1.7 g/cm 3 . While generally polymers/plastics with low density,
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