Mechanical Stress - Click to edit Master subtitle style...

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Unformatted text preview: Click to edit Master subtitle style ENGRI 111 Mechanical Response Bridges Str ong so safety is not compr omised Airplanes Al alloy or Car bon composites Lightweight Str ong Cyclic loading dur ing take-off and landing Sports Equipment Str ength Weight I mpact str ength Electronic Devices Withstand str esses developed dur ing heating and cooling Optical Fibers Str ength to withstand str esses encounter ed dur ing application Hard Drives Al alloy or glass-cer amic Str ong enough not br eak or cr ack dur ing oper ation/r otation at high speeds MEMS & NEMS Robust so they will not fail Implants Ti alloys (biocompatible) Str ength and toughness Last for many year s ocw.mit.edu Click to edit Master subtitle style WHAT IS STRONG? Design Rules Strong Stiff Ductile Tough Stress (Cause) Stress () = Force (N)/Area (m2) Pa: N /m2 MPa = 106 Pa GPa = 109 Pa TENSILE COMPRESSIVE Type of Stresses Type of Stresses BENDING SHEAR Strain (Effect) Str ain = change in dimensions ( l)/(length, l0) Unit-less What does = 1 mean? Elastic str ain: fully r ecover able, nor per manent M etal spr ing str etched by a small amount Elastic/Plastic Deformation Load bearing application no plastic deformation Shaping materials Permanent (plastic deformation) Mechanical Masurements www.secam.ex.ac.uk Plastic defor mation:...
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This note was uploaded on 10/21/2009 for the course ENGRI 1110 at Cornell University (Engineering School).

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Mechanical Stress - Click to edit Master subtitle style...

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