scholarly journals A Thermo-Poro-Visco-Plastic Shear Band Model for Seismic Triggering and Evolution of Catastrophic Landslides

2007 ◽  
Vol 47 (1) ◽  
pp. 11-25 ◽  
Author(s):  
Nikos Gerolymos ◽  
Ioannis Vardoulakis ◽  
George Gazetas
Keyword(s):  
Shear Band ◽  
Band Model ◽  
Plastic Shear ◽  
Seismic Triggering

SHEAR BAND OBSERVATIONS AND DERIVATIONS OF REQUIREMENTS FOR A SHEAR BAND MODEL

1985 ◽  
Vol 46 (C5) ◽  
pp. C5-273-C5-282
Author(s):  
L. Seaman ◽  
D. R. Curran ◽  
D. C. Erlich ◽  
T. Cooper ◽  
O. Dullum
Keyword(s):  
Shear Band ◽  
Band Model

Quantitative Study of Shear Localization in Chip Formation while Machining Ti-6Al-4V

2009 ◽  
Vol 407-408 ◽  
pp. 412-415
Author(s):  
Dong Liu ◽  
Wu Yi Chen ◽  
Hong Hai Xu ◽  
Xue Ke Luo ◽  
Hui Liang
Keyword(s):  
Shear Band ◽  
Shear Flow ◽  
Quantitative Study ◽  
Cutting Speed ◽  
Optical Microscope ◽  
Shear Localization ◽  
Adiabatic Shear ◽  
Plastic Shear ◽  
Orthogonal Machining ◽  
Cutting Speeds

The formation of shear localized chips in orthogonal machining of Ti-6Al-4V was investigated. The chips in different cutting velocities were collected and the structure of the adiabatic shear localization was examined by optical microscope and SEM after polishing and eroding. The serrated coefficient, serrated frequency and fibred coefficient were proposed in this paper to characterize the degree of serration and plastic shear flow of the chip quantitatively. Experimental results show that the width of the shear band decreased and the fibred coefficient of the shear band increased as cutting speed increased. The serrated and frequency, the serrated coefficient increased with the increase of cutting speed in the experimental range of cutting speeds.

Shear band development in polycrystals

1993 ◽  
Vol 443 (1919) ◽  
pp. 547-562 ◽  
Keyword(s):  
Shear Band ◽  
Strain Rate ◽  
Plane Strain ◽  
Simple Shear ◽  
Biaxial Tension ◽  
Short Interval ◽  
Rate Sensitivity ◽  
Band Model ◽  
Plane Strain Tension ◽  
Deformation State

Shear band localizations are studied using a band model involving two polycrystalline aggregates; one representing the material inside the potential band and the other the material outside. Each of these aggregates is assumed to be homogeneously deformed and conditions of compatibility and equilibrium are enforced across the band interfaces. The aggregate constitutive response is obtained from a generalized Taylor polycrystal model, in which each grain is characterized in terms of an elastic–viscoplastic continuum slip constitutive relation, so that no ambiguity arises concerning the choice of active slip systems. Because of the material rate sensitivity a shear band bifurcation is ruled out at achievable strain levels, but localization occurs from the growth of an initial inhomogeneity. Results are presented for imposed loading histories of plane strain tension, biaxial tension and simple shear, both for an initially isotropic aggregate and for an aggregate that has undergone a pre-strain in plane strain compression. Depending on the material properties, the initial conditions and the imposed deformation state, either (i) localization, in the sense of a very high strain rate concentration in the band, takes place; or (ii) the band strain rate increases rapidly for a short interval and then saturates; or (iii) the initial inhomogeneity does not induce a large strain rate concentration in the band. The initial pre-strain promotes earlier localization in plane strain tension and in simple shear. In biaxial tension, localization occurs earlier for the pre-strained material if the initial imperfection is large, but tends to saturate for smaller imperfections. The effects of variations in imperfection amplitude and material strain rate sensitivity are illustrated.

Further Development of a Computational Shear Band Model.

1980 ◽  
Author(s):  
D. C. Erlich ◽  
D. R. Curran ◽  
L. Seaman
Keyword(s):  
Shear Band ◽  
Band Model ◽  
Further Development

On evolution of thermo-plastic shear band

1986 ◽  
Vol 2 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Bai Yilong ◽  
Cheng Chemin ◽  
Yu Shanbing
Keyword(s):  
Shear Band ◽  
Plastic Shear
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