scholarly journals Straintronics beyond homogeneous deformation

2019 ◽  
Vol 99 (12) ◽  
Author(s):  
R. Gupta ◽  
F. Rost ◽  
M. Fleischmann ◽  
S. Sharma ◽  
S. Shallcross
Keyword(s):  
Homogeneous Deformation

General theory of small elastic deformations superposed on finite elastic deformations

1952 ◽  
Vol 211 (1104) ◽  
pp. 128-154 ◽  
Keyword(s):  
General Theory ◽  
Elastic Material ◽  
Finite Deformation ◽  
Plane Surface ◽  
Thin Sheet ◽  
Potential Functions ◽  
Homogeneous Deformation ◽  
Infinitesimal Deformation ◽  
Elastic Deformations ◽  
Isotropic Elastic Material

Using tensor notations a general theory is developed for small elastic deformations, of either a compressible or incompressible isotropic elastic body, superposed on a known finite deformation, without assuming special forms for the strain-energy function. The theory is specialized to the case when the finite deformation is pure homogeneous. When two of the principal extension ratios are equal the changes in displacement and stress due to the small superposed deformation are expressed in terms of two potential functions in a manner which is analogous to that used in the infinitesimal deformation of hexagonally aeolotropic materials. The potential functions are used to solve the problem of the infinitesimally small indentation, by a spherical punch, of the plane surface of a semi-infinite body of incompressible isotropic elastic material which is first subjected to a finite pure homogeneous deformation symmetrical about the normal to the force-free plane surface. The general theory is also applied to the infinitesimal deformation of a thin sheet of incompressible isotropic elastic material which is first subjected to a finite pure homogeneous deformation by forces in its plane. A differential equation is obtained for the small deflexion of the sheet due to small forces acting normally to its face. This equation is solved completely in the case of a clamped circular sheet subjected to a pure homogeneous deformation having equal extension ratios in the plane of the sheet, the small bending force being uniformly distributed over a face of the sheet. Finally, equations are obtained for the homogeneously deformed sheet subjected to infinitesimal generalized plane stress, and a method of solution by complex variable technique is indicated.

scholarly journals Effect of Hydrogen Charging on Pop-in Behavior of a Zr-Based Metallic Glass

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 22 ◽  
Author(s):  
Lin Tian ◽  
Dominik Tönnies ◽  
Moritz Hirsbrunner ◽  
Tim Sievert ◽  
Zhiwei Shan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Metallic Glass ◽  
Spatial Correlation ◽  
Hydrogen Content ◽  
Amorphous Structure ◽  
Homogeneous Deformation ◽  
Hydrogen Charging ◽  
Shear Transformation ◽  
Shear Transformation Zones ◽  
Clear Increase

In this work, structural and mechanical properties of hydrogen-charged metallic glass are studied to evaluate the effect of hydrogen on early plasticity. Hydrogen is introduced into samples of a Zr-based (Vit 105) metallic glass using electrochemical charging. Nanoindentation tests reveal a clear increase in modulus and hardness as well as in the load of the first pop-in with increasing hydrogen content. At the same time, the probability of a pop-in occurring decreases, indicating that hydrogen hinders the onset of plastic instabilities while allowing local homogeneous deformation. The hydrogen-induced stiffening and hardening is rationalized by hydrogen stabilization of shear transformation zones (STZs) in the amorphous structure, while the improved ductility is attributed to the change in the spatial correlation of the STZs.

scholarly journals Some Dynamics Studies on Urumqi Glacier No. 1, Tianshan Glaciological Station. China

1989 ◽  
Vol 12 ◽  
pp. 70-73 ◽  
Author(s):  
Huang Maohuan ◽  
Wang Zhongxiang ◽  
Cai Baolin ◽  
Han Jiankang
Keyword(s):  
Melting Point ◽  
Strain Rate ◽  
Simple Shear ◽  
Pure Shear ◽  
Equilibrium Line ◽  
Homogeneous Deformation ◽  
Ablation Area ◽  
Inner Parts

The zero isopleth of surface areal strain-rate is roughly parallel to, but below, the equilibrium line of the glacier. In the middle and lower parts of the ablation area, the basal temperature is either close to or at the melting point, whereas above and around the equilibrium line the glacier is frozen to its bed. The basal bulk ice is deforming continuously and inhomogeneously but, in the inner parts of the glacier, where the strain-rate is smaller, homogeneous deformation can only be assumed conditionally. In the ablation area, pure shear is predominant near the base of the glacier and simple shear becomes progressively more important from the inner parts of the glacier towards its margins.

Homogeneous flow of bulk metallic glass composites with a high volume fraction of reinforcement

2007 ◽  
Vol 22 (6) ◽  
pp. 1564-1573 ◽  
Author(s):  
X.L. Fu ◽  
Y. Li ◽  
C.A. Schuh
Keyword(s):  
Glass Transition ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Volume Fraction ◽  
High Volume ◽  
Strain Rate Range ◽  
Homogeneous Deformation ◽  
Deformation Analysis ◽  
Glass Composites ◽  
Glass Matrix Composites

We present a systematic study of homogeneous deformation in a La-based bulk metallic glass and two in situ composites based on the same glass. In contrast to prior investigations, which focused on relatively dilute composites, in this work the reinforcement volume percentages were more concentrated at 37% and 52%—near or above the percolation threshold (35–40%). Hot uniaxial compressive testing was conducted over a wide strain rate range from 10−2to 10−5s−1at a temperature near the glass transition. For such concentrated composites, the homogeneous deformation behavior appeared to be dominated by the properties of the reinforcement phase; in the present case the La reinforcements deformed by glide-controlled creep. Post-deformation analysis suggested that bulk metallic glass matrix composites were susceptible to microstructural evolution, which appeared to be enhanced by deformation, in contrast with a stress-free anneal. Consequently, unreinforced bulk metallic glass appeared to be more structurally stable than its composites during deformation near the glass transition.

Macroscopically homogeneous deformation in injection molded polypropylene induced by annealing studied with microbeam X-ray scattering

Polymer ◽  
2015 ◽  
Vol 70 ◽  
pp. 315-325 ◽  
Author(s):  
Kazuya Matsui ◽  
Akinori Bando ◽  
Takashi Sakurai ◽  
Yuya Shinohara ◽  
Toshiya Maruyama ◽  
...  
Keyword(s):  
Homogeneous Deformation ◽  
X Ray ◽  
X Ray Scattering ◽  
Injection Molded ◽  
Ray Scattering
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