FINAL 222 - F I NAL REV IEW 1. ELASTIC DEFORMAT ION:...

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Unformatted text preview: F I NAL REV IEW 1. ELASTIC DEFORMAT ION: stretching interatomic bond and reversible deformation. Stress is equivalent to strain. Slope (m) = E (modulus of elasticity). PLASTIC DEFORMAT ION: breaking and reforming of new bonds when deformation occurs, irreversible and permanent damage. For crystals, plastic deformation occurs via slip and dislocation motion. For amorphous, via viscous flow. 2. SLIP SYSTEM : it is the combination of a slip plane, which is the closely packed plane, and the slip direction, which is the closely packed direction. A typical slip system in BCC crystals is 12 systems with {111} and <111>. 3. STRAIN HARDEN I NG : it is the hardening in the materials as they undergo plastic deformation. EX: Metal tube. *Materials become stronger during strain hardening due to the creation of dislocation. Higher Strain hardening=higher ductility. 4. 3 D IF FERENT TECHN IQUES TO MEASURE HARDNESS : ROCKWELL HARDNESS TEST : most usually test, in which various indenters forced into the material surface BR INELL HARDNESS TEST:...
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This note was uploaded on 09/24/2011 for the course MEEN 222 taught by Professor Radovic during the Spring '08 term at Texas A&M.

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FINAL 222 - F I NAL REV IEW 1. ELASTIC DEFORMAT ION:...

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