Correction to: Nanoscale Coal Deformation and Alteration of Porosity and Pore Orientation Under Uniaxial Compression: An In Situ SANS Study

In the process of coalbed methane exploitation, the fracture and pore structure is the key problem that affects the permeability of coalbed. At present, the coupling effect of fracture and pore structure and in situ stress is seldom considered in the study of coal seam permeability. In this paper, the fractal seepage model is coupled with coal deformation, and the adsorption expansion effect is considered. A multifield coupling model considering the influence of matrix and fracture structure is established. Then, the influence of pore structure parameters of main fracture on macropermeability is analyzed, including (1) fractal dimension of fracture length, (2) maximum fracture length, (3) fractal dimension of throat diameter, and (4) fractal dimension of throat bending. At the same time, the simulation results are compared with the results of Darcy’s uniform permeability model. The results show that the permeability calculated by the proposed model is significantly different from that calculated by the traditional cubic model. Under the action of in situ stress, when the porosity and other parameters remain unchanged, the macropermeability of coal is in direct proportion to the fractal dimension of coal fracture length, the fractal dimension of throat diameter, and the maximum fracture length and in inverse proportion to the fractal dimension of coal throat curvature.

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Effect of Non-Hydrostatic Stress on Kinetics and Interfacial Roughness During Solid Phase Epitaxial Growth in Si

MRS Proceedings ◽

10.1557/proc-441-75 ◽

1996 ◽

Vol 441 ◽

Cited By ~ 8

Author(s):

William Barvosa-Carter ◽

Michael J. Aziz

Keyword(s):

Growth Rate ◽

Epitaxial Growth ◽

Uniaxial Compression ◽

Solid Phase ◽

Hydrostatic Stress ◽

Uniaxial Stress ◽

Cross Sectional ◽

Time Resolved ◽

Crystal Interface

AbstractWe report preliminary in-situ time-resolved measurements of the effect of uniaxial stress on solid phase epitaxial growth in pure Si (001) for the case of stress applied parallel to the amorphous-crystal interface. The growth rate is reduced by the application of uniaxial compression, in agreement with previous results. Additionally, the velocity continues to decrease with time. This is consistent with interfacial roughening during growth under stress, and is supported by both reflectivity measurements and cross-sectional TEM observations. We present a new kinetically-driven interfacial roughening mechanism which is consistent with our observations.

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Brief communication: Full-field deformation measurement for uniaxial compression of sea ice by using the digital image correlation method

10.5194/tc-2018-263 ◽

2019 ◽

Author(s):

Anliang Wang ◽

Zhijun Wei ◽

Xiaodong Chen ◽

Shunying Ji ◽

Yu Liu ◽

...

Keyword(s):

Digital Image Correlation ◽

Sea Ice ◽

Uniaxial Compression ◽

Digital Image ◽

Correlation Method ◽

Nonlinear Behavior ◽

Image Correlation ◽

Mechanical Behaviors ◽

Full Field

Abstract. We took advantage of digital image correlation to measure the full-field deformation of sea ice in a uniaxial compression experiment in situ. The characteristics of failure mode, nonlinear behavior and crack propagation are all captured by the strain field of specimens. To our knowledge, this is the first attempt to experimentally capture sequential full-field deformations in the mechanical properties of sea ice. This achievement will extend the ability to further explore the complex mechanical behaviors of sea ice.

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Hybrid aerogels and bioactive aerogels under uniaxial compression: an in situ SAXS study

Revista de Metalurgia ◽

10.3989/revmetalmadrid.18xiipms ◽

2010 ◽

Vol 46 (Extra) ◽

pp. 143-148

Author(s):

V. Morales-Flórez ◽

N. De la Rosa-Fox ◽

M. Piñero ◽

L. Esquivias

Keyword(s):

Uniaxial Compression ◽

Hybrid Aerogels

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Characteristics and generation mechanism of ULF magnetic signals during coal deformation under uniaxial compression

Journal of Geophysics and Engineering ◽

10.1088/1742-2140/aaac59 ◽

2018 ◽

Vol 15 (4) ◽

pp. 1137-1145 ◽

Cited By ~ 1

Author(s):

Chengwu Li ◽

Shuai Fu ◽

Cheng Guan ◽

Tianyu Wan ◽

Beijing Xie

Keyword(s):

Uniaxial Compression ◽

Generation Mechanism ◽

Coal Deformation

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Creation of Warm Model Ice

Volume 10: Polar and Arctic Science and Technology ◽

10.1115/omae2014-23448 ◽

2014 ◽

Author(s):

R. W. Bos ◽

T. J. Huisman ◽

J. Brouwer ◽

G. Hagesteijn ◽

H. J. de Koning Gans

Keyword(s):

Compressive Strength ◽

Uniaxial Compression ◽

Large Particle ◽

Room Temperature ◽

Expanded Polystyrene ◽

Uniaxial Compression Test ◽

Cold Model ◽

Particle Composite ◽

Ice Model

To predict loads on propellers in ice, model tests can be used. Using regular (refrigerated) cold model ice in ice basins is a valid option. However, these tests are expensive, difficult to reproduce and bound to time and location, due to the required cooling in ice model basins. An alternative would be to use warm model ice, a material with the properties of model ice at room temperature. This paper proposes one variety, using only materials available from DIY stores. Based on theoretical propeller-ice interaction models, it is assumed that the loads come from a crushing process. Hence, the compressive strength follows as dominant material property of ice. To match compressive strength of weak cold model ice, a large particle composite is proposed. Expanded Polystyrene (EPS) beads are used as particles, with paraffin as matrix to produce warm ice specimens. The compressive strength of these specimens were measured with a uniaxial compression test and matched with weak model ice. The specimens were designed for in-situ use in model scale propeller impact tests.

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In-situ neutron diffraction of LaCoO3 perovskite under uniaxial compression. I. Crystal structure analysis and texture development

Journal of Applied Physics ◽

10.1063/1.4884335 ◽

2014 ◽

Vol 116 (1) ◽

pp. 013503 ◽

Cited By ~ 7

Author(s):

Amjad Aman ◽

Yan Chen ◽

Mykola Lugovy ◽

Nina Orlovskaya ◽

Michael J. Reece ◽

...

Keyword(s):

Crystal Structure ◽

Neutron Diffraction ◽

Uniaxial Compression ◽

Structure Analysis ◽

Crystal Structure Analysis ◽

Texture Development ◽

In Situ Neutron Diffraction

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In-Situ Uniaxial Compression Tests of Level Ice: Part I — Ice Strength Variability Versus Length Scale

Volume 2: Ocean Engineering and Polar and Arctic Sciences and Technology ◽

10.1115/omae2006-92450 ◽

2006 ◽

Cited By ~ 2

Author(s):

Svetlana Shafrova ◽

Per Olav Moslet

Keyword(s):

Uniaxial Compression ◽

Ice Cores ◽

Length Scale ◽

Horizontal Distance ◽

Compression Tests ◽

Strength Determination ◽

Level Ice ◽

Ice Strength ◽

Strength Variability

Field programs of the ice strength determination through the uniaxial compression tests were carried out on the landfast level ice both in the Van Mijenfjorden and in the Adventfjorden on Svalbard, Norway in 2004 and 2005. The ice strength was examined in relation to the different length scales. The step (horizontal distance) between the ice samples was continuously reduced in order to find out how the ice strength variability develops. The spatial variation of the physical properties of the ice such as temperature, salinity, density has been measured. The typical ice strength variability for the areas larger than 40 m2 is found about 20–30 % for the vertical ice cores of the certain depth from the ice cover surface. For the horizontal ones it is slightly less about 10–20 %.

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