10-07-Lecture

10-07-Lecture - 1 Mechanical Properties of Materials Part B...

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Unformatted text preview: 1 Mechanical Properties of Materials Part B ENGR 213 2 See MSE demo - Tensile tests METALS - PLASTIC DEFORMATION permanent no volume to onset of necking; shape Crystalline Atoms break bonds New bonds formed amorphous : viscous flow plastic properties LARGE effect from microstructure, composition, prior history Strain YIELD STRENGTH yield strength yielding begins Linear region materials resistance to PD w/ temp proportional limit 0.2% or 0.002 offset stress to = 0.005 if matl nonlinear elastic f(dislocation motion) y = 35 - 1400 MPa for metals Yield Point Phenomenon Some steels clear onset on nonlinear region Two yield points Upper point lower yield point = y Yield point behaviour Tensile Strength tensile strength ( w/ temp) Maximum sustainable stress necking begins f(dislocation motion; -hardening) TS = 50 - 3000 MPa for metals fracture strength @ failure Usual strength quoted is yield strength tensile strength necking Ductility...
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This note was uploaded on 03/26/2008 for the course ENGR 213 taught by Professor Dr.stubbs during the Fall '04 term at Texas A&M.

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10-07-Lecture - 1 Mechanical Properties of Materials Part B...

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