Thermoelastic processes in deformable solid bodies with point defects

1993 ◽  
Vol 63 (1) ◽  
pp. 19-22
Author(s):  
V. N. Yuzevich
Keyword(s):  
Point Defects ◽  
Deformable Solid ◽  
Solid Bodies

scholarly journals GEODYNAMICS

GEODYNAMICS ◽  
2011 ◽  
Vol 2(11)2011 (2(11)) ◽  
pp. 138-140
Author(s):  
H.H. Kuliyev ◽  
Keyword(s):  
Phase Transitions ◽  
Equilibrium State ◽  
Linear Theory ◽  
Structural Instability ◽  
Loss Of Stability ◽  
Geometric Form ◽  
Deformable Solid ◽  
The Earth ◽  
Internal Structures ◽  
Solid Bodies

The processes of consolidation, deconsolidation, phase transitions and destructions in the terms of internal structures of the Earth аre studied on the base of non-linear theory of deformable solid bodies. It is shown that the loss of stability of equilibrium state can precede to the processes of deconsolidation, phase transitions and destructions on geometric form change (structural instability).

scholarly journals Nondestructive Identification of Inhomogeneous Residual Stress State in Deformable Bodies on the Basis of the Acoustic Sounding Method

2014 ◽  
Vol 996 ◽  
pp. 409-414 ◽  
Author(s):  
Vladimir Vladimirovich Dudarev ◽  
Rostislav Dmitrievich Nedin ◽  
Alexander Ovanesovich Vatulyan
Keyword(s):  
Residual Stress ◽  
Cylindrical Tube ◽  
Surface Displacement ◽  
Iterative Regularization ◽  
Deformable Solid ◽  
Residual Stress State ◽  
Deformable Bodies ◽  
Load Types ◽  
Solid Bodies ◽  
Set Of Points

Analysis of inhomogeneous residual stress (RS) fields in bodies is one of the major problems of the mechanics of deformable solid bodies. In the present research the new techniques of identification of inhomogeneous RS in bodies are developed on the basis of surface displacement measurement in a set of points under vibrating sounding load. Corresponding nonlinear ill-posed inverse problems (IP) are formulated and solved numerically by means of iterative regularization. Based on computational experiments, the most advantageous sounding load types and frequency ranges providing the best reconstruction accuracy are revealed. The examples for a cantilever, a plate, a layer, and a cylindrical tube are presented.

scholarly journals Continuous and discrete models in the mechanics of deformable solid bodies

2018 ◽  
Vol 184 ◽  
pp. 01004
Author(s):  
Géza Lámer
Keyword(s):  
Continuum Model ◽  
Continuous Medium ◽  
Geometric Model ◽  
Discrete Models ◽  
Deformable Solid ◽  
Medium Model ◽  
Continuous Description ◽  
Discrete Nature ◽  
Solid Bodies ◽  
Discrete Medium

The study provides an overview of modelling possibilities for the mechanical behaviour of media. The discrete, continuous or differential geometric as well as the discrete nature and continuous description grid continuum model in particular are highlighted. We point out that the differential geometric model is based on the concept of continuity and interprets a continuous medium model. We reveal that the grid continuum model is based on the application of numerical method and interprets a discrete medium model.

scholarly journals A Smoothed Finite Element-Based Elasticity Model for Soft Bodies

2017 ◽  
Vol 2017 ◽  
pp. 1-14
Author(s):  
Juan Zhang ◽  
Mingquan Zhou ◽  
Youliang Huang ◽  
Pu Ren ◽  
Zhongke Wu ◽  
...  
Keyword(s):  
Computational Cost ◽  
Smoothing Method ◽  
Deformable Solid ◽  
Mesh Distortion ◽  
Softening Effect ◽  
Adaptive Smoothing ◽  
Large Rotation ◽  
Distorted Mesh ◽  
Strain Smoothing ◽  
Solid Bodies

One of the major challenges in mesh-based deformation simulation in computer graphics is to deal with mesh distortion. In this paper, we present a novel mesh-insensitive and softer method for simulating deformable solid bodies under the assumptions of linear elastic mechanics. A face-based strain smoothing method is adopted to alleviate mesh distortion instead of the traditional spatial adaptive smoothing method. Then, we propose a way to combine the strain smoothing method and the corotational method. With this approach, the amplitude and frequency of transient displacements are slightly affected by the distorted mesh. Realistic simulation results are generated under large rotation using a linear elasticity model without adding significant complexity or computational cost to the standard corotational FEM. Meanwhile, softening effect is a by-product of our method.

Microstructural Evolution in Reduced TiO2

1981 ◽  
Vol 39 ◽  
pp. 74-75
Author(s):  
W. T. Donlon ◽  
S. Shinozaki ◽  
E. M. Logothetis ◽  
W. Kaizer
Keyword(s):  
Microstructural Evolution ◽  
Point Defects ◽  
Extended Defects ◽  
Small Deviations ◽  
Controlled Atmospheres ◽  
Limited Solubility ◽  
Thin Foils ◽  
Heat Treated ◽  
Porous Polycrystalline ◽  
Crystallographic Shear

Since point defects have a limited solubility in the rutile (TiO2) lattice, small deviations from stoichiometry are known to produce crystallographic shear (CS) planes which accomodate local variations in composition. The material used in this study was porous polycrystalline TiO2 (60% dense), in the form of 3mm. diameter disks, 1mm thick. Samples were mechanically polished, ion-milled by conventional techniques, and initially examined with the use of a Siemens EM102. The electron transparent thin foils were then heat-treated under controlled atmospheres of CO/CO2 and H2 and reexamined in the same manner.The “as-received” material contained mostly TiO2 grains (∼5μm diameter) which had no extended defects. Several grains however, aid exhibit a structure similar to micro-twinned grains observed in reduced rutile. Lattice fringe images (Fig. 1) of these grains reveal that the adjoining layers are not simply twin related variants of a single TinO2n-1 compound. Rather these layers (100 - 250 Å wide) are alternately comprised of stoichiometric TiO2 (rutile) and reduced TiO2 in the form of Ti8O15, with the Ti8O15 layers on either side of the TiO2 being twin related.

Simulated Dark-Field Electron Micrographs of Point Defects and Organometallics

1975 ◽  
Vol 33 ◽  
pp. 200-201
Author(s):  
William Krakow
Keyword(s):  
Electron Micrographs ◽  
Point Defects ◽  
Structure Determination ◽  
Atomic Structure ◽  
Image Interpretation ◽  
Dark Field ◽  
Field Electron ◽  
Dark Field Microscopy ◽  
Dark Field Electron

Tilted beam dark-field microscopy has been applied to atomic structure determination in perfect crystals, several synthesized molecules with heavy atcm markers and in the study of displaced atoms in crystals. Interpretation of this information in terms of atom positions and atom correlations is not straightforward. Therefore, calculated dark-field images can be an invaluable aid in image interpretation.

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