ENGRI111_30_mechanical - ENGRI 111 Mechanical Response...

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ENGRI 111 ENGRI 111 Mechanical Response Mechanical Response
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Bridges Bridges Strong so safety is not compromised
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Airplanes Airplanes Al alloy or Carbon composites Lightweight Strong Cyclic loading during take-off and landing
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Sports Equipment Sports Equipment Strength Weight Impact strength
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Electronic Devices Electronic Devices Withstand stresses developed during heating and cooling
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Optical Fibers Optical Fibers Strength to withstand stresses encountered during application
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Hard Drives Hard Drives Al alloy or glass-ceramic Strong enough not break or crack during operation/rotation at high speeds
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Robust so they will not fail
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Implants Implants Ti alloys (biocompatible) Strength and toughness Last for many years ocw.mit.edu
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WHAT IS STRONG? WHAT IS STRONG?
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Design Rules Design Rules Strong Stiff Ductile Tough
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Stress (Cause) Stress (Cause) Stress (σ) = Force (N)/Area (m 2 ) Pa: N /m 2 MPa = 10 6 Pa GPa = 10 9 Pa
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TENSILE COMPRESSIVE Type of Stresses Type of Stresses
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Type of Stresses Type of Stresses BENDING SHEAR
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ENGRI111_30_mechanical - ENGRI 111 Mechanical Response...

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