Mechanical Behavior of Materials |
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Page 302
... COBLE CREEP . Coble creep is closely related to NH creep ; for example , Coble creep is driven by the same vacancy concentration gradient . However , in Coble creep mass transport occurs by diffusion along grain boundaries in a poly ...
... COBLE CREEP . Coble creep is closely related to NH creep ; for example , Coble creep is driven by the same vacancy concentration gradient . However , in Coble creep mass transport occurs by diffusion along grain boundaries in a poly ...
Page 310
... creep operate independently , and the resultant diffusional creep rate is the sum of the respective creep rates , i.e. , & DIFF ENH + EC ( 7.21 ) Since both NH and Coble creep depend linearly on stress , which of the two processes ...
... creep operate independently , and the resultant diffusional creep rate is the sum of the respective creep rates , i.e. , & DIFF ENH + EC ( 7.21 ) Since both NH and Coble creep depend linearly on stress , which of the two processes ...
Page 320
... Coble creep is the dominant mechanism for both grain Temperature ( ° C ) -200 0 200 400 600 10-1 Ideal strength 800 ... creep 10-4 Typical turbine operation 10 102 10-7 10-8 N - H10 creep 10-5 Coble creep 10-9 10-10 / s Shear stress at ...
... Coble creep is the dominant mechanism for both grain Temperature ( ° C ) -200 0 200 400 600 10-1 Ideal strength 800 ... creep 10-4 Typical turbine operation 10 102 10-7 10-8 N - H10 creep 10-5 Coble creep 10-9 10-10 / s Shear stress at ...
Contents
Overview of Mechanical Behavior | 1 |
Toughening Mechanisms and the Physics of Fracture | 10 |
Elastic Behavior | 44 |
Copyright | |
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alloys applied stress behavior bonding brittle Burgers vector ceramics Chap CHAPTER Coble creep composite compression crack growth crack propagation crack tip craze creep fracture creep rate Crystalline Materials cubic curve cyclical decreases depends discussed dislocation density dislocation line dislocation motion displacement ductile ductile fracture edge dislocation embrittlement energy equation example fatigue fcc metals fiber Figure flow stress Fracture Mechanics fracture toughness glass grain boundaries hardening high-temperature increases initial length linear elastic loading low-temperature macroscopic martensite material's matrix MN/m² modulus nucleation obstacles particle phase plastic deformation plastic flow plastic strain polycrystalline polycrystals polymers precipitation Prob ratio region result Schematic screw dislocation SECTION shear stress shown in Fig single crystal slip direction slip plane slip systems solids steel strain rate strengthening stress-strain structure superplastic surface takes place TCRSS temperature tensile axis tensile strength tensile stress tion toughening transition viscoelastic volume fraction work-hardening yield strength