a6 - index for energy-limited failure under fracture at...

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Homework 1 Hint… A company has asked you to help their business in space tourism. They have designed a rocket  that will be powered by nitrous oxide (reacted with rubber), and you are to select materials for the  fuel tank (pressure vessel). a) Considering the flight will be at high altitude (the edge of space), suggest materials that will  have a good fracture toughness low temperature. THe M1 index should consider brittle failure  under a displacement-limited design. Find materials with M1 > 10. b) To increase passenger safety and spacecraft performance, consider M2 a second material 
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Unformatted text preview: index for energy-limited failure under fracture at minimum mass. Hint: Recall that toughness is the integral of the stress-strain curve (energy), and find an index that will maximize fracture toughness. M2 > 0.25 required. We are given 4 formulas. , , , For part a), this is how I solved it. , divide both sides by E., we know, , so substituting gives me, all in all. .. so. .. to maximize the fracture toughness, under displacement-limited design. b) so i get. .....
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