Elastic and plastic deformation in nanocrystalline metals

2011 ◽  
pp. 329-374 ◽  
Author(s):  
M.Y. Gutkin
Keyword(s):  
Plastic Deformation ◽  
Nanocrystalline Metals ◽  
Elastic And Plastic Deformation

Deformation, Fracture, and Friction Processes

2020 ◽  
pp. 14-24
Author(s):  
Francois Louchet
Keyword(s):  
Plastic Deformation ◽  
Ductile Failure ◽  
Scientific Validity ◽  
Coulomb’S Friction ◽  
Dynamic Loadings ◽  
Triggering Mechanisms ◽  
The Difference ◽  
Elastic And Plastic Deformation ◽  
Physical Quantities ◽  
Rupture Criterion

The main mechanical and physical quantities and concepts ruling deformation, fracture, and friction processes are recalled, with particular attention paid to the simplicity of the analysis, but without betraying the scientific validity of the arguments. We particularly discuss the difference between between elastic and plastic deformation, and quasistatic and dynamic loadings, essential in avalanche triggering mechanisms. The physical origin of Griffith’s rupture criterion that rules both fracture nucleation and propagation, and the transition between brittle and ductile failure processes, is thoroughly discussed. We also explain the physical meaning of the classical Coulomb’s friction law, showing why it can hardly apply to a non-conventional porous, brittle, and healable solid like snow.

Effect of Plastic Deformation on Oscillations in "d" vs. sin2ψ Plots a FEM Analysis

1988 ◽  
Vol 32 ◽  
pp. 355-364 ◽  
Author(s):  
I. C. Noyan ◽  
L. T. Nguyen
Keyword(s):  
Plastic Deformation ◽  
Fem Analysis ◽  
Relative Contribution ◽  
Elastic And Plastic Deformation

AbstractOscillations jn "d" vs. sin2ψ plots are due to the inhomogeneous partitioning of strains within the diffracting volume. In polycrystalline specimens, such inhomogeneity can be caused by the elastic incompatibility of neighboring grains or by the inhoniogeneous partitioning of plastic deformation within the diffracting volume. There is, however, little work on the degree of inhomogeneity required to cause a given oscillation, and the relative contribution from the elastic and plastic deformation components to a given oscillation.

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