scholarly journals DESIGN AND ESTIMATION FOR DEFORMATION BEHAVIOR OF ROCK FOUNDATION IN A LARGE-SCALE VERTICAL EXCAVATION

2005 ◽  
Vol 2005 (798) ◽  
pp. 798_63-798_74
Author(s):  
Toru HASHIMOTO ◽  
Akira TERADA ◽  
Koji MORITA ◽  
Isao MAEKAWA ◽  
Hideki KATAGAWA
Keyword(s):  
Deformation Behavior ◽  
Large Scale ◽  
Rock Foundation ◽  
Vertical Excavation

scholarly journals Deformation Behavior of Nanocrystalline Body-Centered Cubic Iron with Segregated, Foreign Interstitial: A Molecular Dynamics Study

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5351
Author(s):  
Ahmed Tamer AlMotasem ◽  
Matthias Posselt ◽  
Tomas Polcar
Keyword(s):  
Molecular Dynamics ◽  
Grain Boundary ◽  
Deformation Behavior ◽  
Large Scale ◽  
Grain Boundary Sliding ◽  
Carbon And Nitrogen ◽  
Embedded Atom ◽  
Boundary Sliding ◽  
Dynamics Simulations

In the present work, modified embedded atom potential and large-scale molecular dynamics’ simulations were used to explore the effect of grain boundary (GB) segregated foreign interstitials on the deformation behavior of nanocrystalline (nc) iron. As a case study, carbon and nitrogen (about 2.5 at.%) were added to (nc) iron. The tensile test results showed that, at the onset of plasticity, grain boundary sliding mediated was dominated, whereas both dislocations and twinning were prevailing deformation mechanisms at high strain. Adding C/N into GBs reduces the free excess volume and consequently increases resistance to GB sliding. In agreement with experiments, the flow stress increased due to the presence of carbon or nitrogen and carbon had the stronger impact. Additionally, the simulation results revealed that GB reduction and suppressing GBs’ dislocation were the primary cause for GB strengthening. Moreover, we also found that the stress required for both intragranular dislocation and twinning nucleation were strongly dependent on the solute type.

Application of Processing Method Enlarging a Partial Diameter to Shaft Parts of Practical Size

2005 ◽  
Vol 475-479 ◽  
pp. 3065-3070 ◽  
Author(s):  
Kazuki Mori ◽  
Nagatoshi Okabe ◽  
Xia Zhu ◽  
Tadashi Iura
Keyword(s):  
Compressive Stress ◽  
Deformation Behavior ◽  
Large Scale ◽  
Processing Method ◽  
Curvature Radius ◽  
Bending Angle ◽  
Round Bar ◽  
Novel Processing ◽  
Axial Compressive Stress ◽  
Industrial Machine

. A novel processing method was proposed to enlarge a partial diameter in the middle of a round bar with an experimental size of 10mm in diameter. To confirm that the processing method is applicable also to shaft with a practical size of 25mm-60mm in diameter for general industrial machine, a large-scale processing machine was developed. Deformation behavior of diameter in a processed part during processing process was made to an expression. The several influences, such as bending angle θ, axial-compressive stress σc, diameters D0, rotation number N of shaft and curvature radius ρ, on the increase behavior of diameter were estimated quantitatively.

Response of Sluice-Dam Structure on a Strong Earthquake Excitation

2013 ◽  
Vol 444-445 ◽  
pp. 874-878
Author(s):  
Lei Ge ◽  
Li Xiang Zhang ◽  
Ze Li
Keyword(s):  
Strong Earthquake ◽  
Large Scale ◽  
Complex Structure ◽  
Three Dimensional ◽  
Time History ◽  
Dynamical Response ◽  
Rock Foundation ◽  
Earthquake Excitation ◽  
Reservoir Water ◽  
High Rise

For a high-rise complex structure built at an earthquake zone, response characteristics to an earthquake action are always needed to be as an important index to evaluate its dynamical performances. This article carried out a three-dimensional dynamical response analyses of a large-scale complex sluice-dam structure by using the software of ANSYS under a strong earthquake excitation by nonlinear finite element method. Through the analyses of the time history response of the high-rise complex structure to the specified earthquake records, the seismic performances of the structure system under consideration of the rock foundation-sluice structure-reservoir water interaction were well evaluated.

scholarly journals A large-scale vertical excavation work using the observational construction method in soft rock mass.

1990 ◽  
pp. 163-169
Author(s):  
Hidetoshi NAGATA ◽  
Hirokazu HAYASHI ◽  
Hiroaki INOUE ◽  
Tadashi TAKANO
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Soft Rock ◽  
Construction Method ◽  
Excavation Work ◽  
Vertical Excavation

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

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