ch09 - Chapter 9 Failure Concept Check 9.1 Question: Cite...

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Chapter 9 Failure Concept Check 9.1 Question: Cite two situations in which the possibility of failure is part of the design of a component or product. Answer: Several situations in which the possibility of failure is part of the design of a component or product are as follows: (1) the pull tab on the top of aluminum beverage cans; (2) aluminum utility/light poles that reside along freeways—a minimum of damage occurs to a vehicle when it collides with the pole; and (3) in some machinery components, a shear pin is used to connect a gear or pulley to a shaft—the pin is designed shear off before damage is done to either the shaft or gear in an overload situation.
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Concept Check 9.2 Question: Make a schematic sketch of a stress-versus-time plot for the situation when the stress ratio R has a value of +1. Answer: For a stress ratio ( R ) of +1, then, from Equation 9.18, σ max = σ min This is to say that the stress remains constant (or does not fluctuate) with time, or the stress- versus-time plot would appear as
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This note was uploaded on 05/19/2008 for the course MS 4032 taught by Professor Anony during the Spring '08 term at A.T. Still University.

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ch09 - Chapter 9 Failure Concept Check 9.1 Question: Cite...

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