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.

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.

scholarly journals Plastic deformation simulation of steel panels

2019 ◽  
Vol 29 ◽  
pp. 02012
Author(s):  
Mihaela Savin ◽  
Adrian Presura ◽  
Ionel Chirica
Keyword(s):  
Plastic Deformation ◽  
Numerical Simulations ◽  
Fem Analysis ◽  
Vertical Displacement ◽  
Displacement Transducer ◽  
Force Transducer ◽  
Spherical Indenter ◽  
Steel Panel ◽  
Experimental Stand ◽  
Steel Panels

This paper presents the FEM analysis of plastic deformation of different steel panels using a spherical indenter. Two experiments were done: first on a simple steel panel and second on a stiffened steel panel, which were subjected to a static plastic deformation produced with help of a spherical indenter. The results of the practical test were compared with the results of numerical simulations, which were accomplished using ANSYS-Static Structural module. The tests were realized using an experimental stand based on a screw press mechanism. The tests consist in vertical displacement of the spherical bulb, which in this way deformed the panel leaning on the stand frame. During the tests were measured the force applied to the indenter, with help of an PLC500 force transducer, and the vertical displacement of the panel in the application point of force, with help of an HBM WA/300 displacement transducer. The results of calculations are presented below as: final deformed models and force-displacement diagrams with the comparison between experiment and numerical simulation. In conclusion of this research the compared results between the experiments and numerical simulations revealed that can be achieved accurate results using FEM analysis for plastic deformation problems, with proper parameters settings.

scholarly journals FEM analysis of the plastic deformation of the regular arched asperities in the two-stage cold metal forming processes

2019 ◽  
Author(s):  
Leon Kukielka ◽  
Lukasz Bohdal ◽  
Jaroslaw Chodor ◽  
Katarzyna Gotowala ◽  
Pawel Kaldunski ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Metal Forming ◽  
Fem Analysis ◽  
Two Stage ◽  
Cold Metal

Characterization of Plastic Deformation Induced by Microscale Laser Shock Peening

2004 ◽  
Vol 71 (5) ◽  
pp. 713-723 ◽  
Author(s):  
Hongqiang Chen ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Plastic Deformation ◽  
Single Crystal ◽  
Crystal Lattice ◽  
Electron Backscatter Diffraction ◽  
Fem Analysis ◽  
Copper Sample ◽  
Laser Shock Peening ◽  
Lattice Rotation ◽  
Laser Shock ◽  
Shock Peening

Electron backscatter diffraction (EBSD) is used to investigate crystal lattice rotation caused by plastic deformation during high-strain rate laser shock peening in single crystal aluminum and copper sample on 110¯ and (001) surfaces. New experimental methodologies are employed which enable measurement of the in-plane lattice rotation under approximate plane-strain conditions. Crystal lattice rotation on and below the microscale laser shock peened sample surface was measured and compared with the simulation result obtained from FEM analysis, which account for single crystal plasticity. The lattice rotation measurements directly complement measurements of residual strain/stress with X-ray micro-diffraction using synchrotron light source and it also gives an indication of the extent of the plastic deformation induced by the microscale laser shock peening.

Plastic Deformation Simulation of Sintered Ferrous Material in Cold-Forging Process

2018 ◽  
Vol 941 ◽  
pp. 552-557
Author(s):  
Yuki Morokuma ◽  
Shinichi Nishida ◽  
Yuichiro Kamakoshi ◽  
Koshi Kanbe ◽  
Tatsuya Kobayashi ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
True Strain ◽  
Fem Analysis ◽  
True Stress ◽  
Density Change ◽  
Cold Forging ◽  
Strain Diagram ◽  
Metal Part ◽  
Forging Process ◽  
Sintering Time

A cold forging process of Mo-alloyed sintered steel was simulated by finite element method (FEM) analysis considering density change in the process. Moreover, the effect of sintering time on the behavior of the densification and the plastic deformation of it in the cold-forging process was also investigated. Using the true stress-true strain diagram obtained by the compression test with a sintered specimen, the modified true stress-true strain diagram was derived for large plastic deformation analysis with the porous material model. The result of FEM analysis for the cold compression process of the sintered specimen revealed that the analysis can simulate the shape of the excessive metal part and density change of it. Also, it was found that local deformation becomes large and thus the excessive metal part extends with increasing sintering time although the difference in the true stress-true strain diagrams is negligible.

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