ENGRI1110_Lect23_Oct21_posted - ENGRI 1110 Mechanical...

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ENGRI 1110 ENGRI 1110 Mechanical Response Mechanical Response Appendix C: C3-C10, C13-C17, C21-C22, C31-C34 Chapter 15 (very short)
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Mechanical Measurements Mechanical Measurements www.secam.ex.ac.uk
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Plastic deformation: material “yields” to applied stress Elastic stretching: linear, recoverable Young’s Modulus (Modulus of Elasticity), E = σ / ε (Hooke’s Law) 1/E : compliance Modulus: units of stress
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www.matsceng.ohio-state.edu ATOMIC SCALE: BONDS ACT LIKE ELASTIC SPRINGS
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Plastic Deformation Plastic Deformation www.matsceng.ohio-state.edu
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(Edge) Dislocation (Edge) Dislocation
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Atoms and Planes Atoms and Planes
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Close Packed Planes Close Packed Planes
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(Edge) Dislocation (Edge) Dislocation www.msm.cam.ac.uk
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Dislocations & Caterpillars
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Grains and Grain Boundaries Grains and Grain Boundaries
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Dislocation Pile-up Dislocation Pile-up Additional stress needs to be applied to make dislocations move through the grain boundary D is grain boundary size Yield strength varies as 1/ D Nanoalloys are strong because of small grains
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This note was uploaded on 02/10/2010 for the course ENGRI 1110 at Cornell University (Engineering School).

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ENGRI1110_Lect23_Oct21_posted - ENGRI 1110 Mechanical...

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