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Unformatted text preview: 11-7-07: Mechanical Response•When we talk about the mech response of diff materials and devices—more than just bridges and planes—mechanical response of materials and certain devices and products—we will go into detail to what happens when you have a device that is heated up and cooled down—putting stress on devices—the possibilities of success and failures.•Bridges○Strong so safety is not compromised.•Airplaes○Aluminum alloy or carbon composites○Lightweight○Strong○Cyclic loading during take-off and landing.•Sports equipment○Strength○Weight○Impact strength•Electronic Devices○Withstand stressed developed during heating and cooling.•Optical fibers○Strength to withstand stresses encountered during appliciation.○Made out of glass—strong but not ductile•Hard drives○Al alloy or glass-ceramic○Strong enough not break or crack during operation/rotation at high speeds○The disck is moving really fast—100 miles per hour•MEMS & NEMS ○Robust so they will not fail. ○Gears made in nano scale but operate in micronscale. •Implants○Ti alloys (biocompatible)○Strength and toughness○Last for many years•What is strong?•Design rules○Strong○Stiff○Ductile○Tough•Stress (Cause)○Stress (sigma)=Force (N)/Area (m2)○Pa: N/m2○MPa=106Pa○GPa= 10...
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This note was uploaded on 10/24/2008 for the course ENGRI 1110 taught by Professor Giannelis during the Fall '07 term at Cornell.
- Fall '07