The first MEMIN shock recovery experiments at low shock pressure (5-12.5 GPa) with dry, porous sandstone

2012 ◽  
Vol 48 (1) ◽  
pp. 99-114 ◽  
Author(s):  
Astrid KOWITZ ◽  
Ralf T. SCHMITT ◽  
W. UWE REIMOLD ◽  
Ulrich HORNEMANN
Keyword(s):  
Shock Pressure ◽  
Porous Sandstone ◽  
Shock Recovery Experiments

Diaplectic quartz glass and SiO2 melt experimentally generated at only 5 GPa shock pressure in porous sandstone: Laboratory observations and meso-scale numerical modeling

2013 ◽  
Vol 384 ◽  
pp. 17-26 ◽  
Author(s):  
A. Kowitz ◽  
N. Güldemeister ◽  
W.U. Reimold ◽  
R.T. Schmitt ◽  
K. Wünnemann
Keyword(s):  
Numerical Modeling ◽  
Quartz Glass ◽  
Shock Pressure ◽  
Porous Sandstone ◽  
Meso Scale

Comparison of Recovery and Recrystallization in Stainless Steel Following Plane-Wave Shock Loading and Explosive Forming

1970 ◽  
Vol 28 ◽  
pp. 428-429 ◽  
Author(s):  
J. A. Korbonski ◽  
L. E. Murr
Keyword(s):  
Stainless Steel ◽  
Shock Loading ◽  
Pressure Pulse ◽  
Shock Pressure ◽  
304 Stainless Steel ◽  
Strain Rates ◽  
Two Dimensional ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Explosive Forming

Comparison of recovery rates in materials deformed by a unidimensional and two dimensional strains at strain rates in excess of 104 sec.−1 was performed on AISI 304 Stainless Steel. A number of unidirectionally strained foil samples were deformed by shock waves at graduated pressure levels as described by Murr and Grace. The two dimensionally strained foil samples were obtained from radially expanded cylinders by a constant shock pressure pulse and graduated strain as described by Foitz, et al.

scholarly journals Use of Image Correlation to Measure Macroscopic Strains by Hygric Swelling in Sandstone Rocks

2021 ◽  
Vol 11 (6) ◽  
pp. 2495
Author(s):  
Belén Ferrer ◽  
María-Baralida Tomás ◽  
David Mas
Keyword(s):  
Cross Correlation ◽  
Pore Space ◽  
Digital Camera ◽  
Experimental Methods ◽  
Image Correlation ◽  
Rock Surface ◽  
Experimental Setup ◽  
Porous Rocks ◽  
Porous Sandstone ◽  
Variable Displacement

Some materials undergo hygric expansion when soaked. In porous rocks, this effect is enhanced by the pore space, because it allows water to reach every part of its volume and to hydrate most swelling parts. In the vicinity, this enlargement has negative structural consequences as adjacent elements support some compressions or displacements. In this work, we propose a normalized cross-correlation between rock surface texture images to determine the hygric expansion of such materials. We used small porous sandstone samples (11 × 11 × 30 mm3) to measure hygric swelling. The experimental setup comprised an industrial digital camera and a telecentric objective. We took one image every 5 min for 3 h to characterize the whole swelling process. An error analysis of both the mathematical and experimental methods was performed. The results showed that the proposed methodology provided, despite some limitations, reliable hygric swelling information by a non-contact methodology with an accuracy of 1 micron and permitted the deformation in both the vertical and horizontal directions to be explored, which is an advantage over traditional linear variable displacement transformers.

scholarly journals Study on the Influence of Geometric Characteristics of Grain Membranes on Permeability Properties in Porous Sandstone

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 587
Author(s):  
Run Shi ◽  
Huaiguang Xiao ◽  
Chengmeng Shao ◽  
Mingzheng Huang ◽  
Lei He
Keyword(s):  
Fluid Flow ◽  
Single Parameter ◽  
Control Group ◽  
Porous Rock ◽  
Permeability Characteristics ◽  
Natural Rock ◽  
Porous Sandstone ◽  
Novel Method ◽  
Boltzmann Method ◽  
Flow Laws

Studying the influence of grain characteristics on fluid flow in complex porous rock is one of the most important premises to reveal the permeability mechanism. Previous studies have mainly investigated the fluid flow laws in complex rock structures using an uncontrollable one single parameter of natural rock models or oversimplified control group models. In order to solve these problems, this paper proposes a novel method to reconstruct models that can independently control one single parameter of rock grain membranes based on mapping and reverse-mapping ideas. The lattice Boltzmann method is used to analyze the influence of grain parameters (grain radius, space, roundness, orientation, and model resolution) on the permeability characteristics (porosity, connectivity, permeability, flow path, and flow velocity). Results show that the grain radius and space have highly positive and negative correlations with permeability properties. The effect of grain roundness and resolution on permeability properties shows a strong regularity, while grain orientation on permeability properties shows strong randomness. This study is of great significance to reveal the fluid flow laws of natural rock structures.

Permeability prediction for porous sandstone using digital twin modeling technology and Lattice Boltzmann method

2021 ◽  
Vol 142 ◽  
pp. 104695
Author(s):  
Huaiguang Xiao ◽  
Lei He ◽  
Jianchun Li ◽  
Chunjiang Zou ◽  
Chengmeng Shao
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Digital Twin ◽  
Modeling Technology ◽  
Permeability Prediction ◽  
Porous Sandstone ◽  
Boltzmann Method ◽  
Twin Modeling

scholarly journals Ultrafast femtosecond pressure modulation of structure and exciton kinetics in 2D halide perovskites for enhanced light response and stability

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chunpeng Song ◽  
Huanrui Yang ◽  
Feng Liu ◽  
Gary J. Cheng
Keyword(s):  
Femtosecond Laser ◽  
Density Functional ◽  
Thermal Conditions ◽  
Light Response ◽  
Shock Pressure ◽  
Laser Shock Processing ◽  
The Density Functional Theory ◽  
Pressure Modulation ◽  
The Stability ◽  
Inorganic Framework

AbstractThe carriers’ transportation between layers of two-dimensional (2D) perovskites is inhibited by dielectric confinement. Here, for the first time, we employ a femtosecond laser to introduce ultrafast shock pressure in the range of 0~15.45 GPa to reduce dielectric confinement by modulating the structure and exciton dynamics in a perovskite single crystal (PSCs), e.g. (F-PEA)2PbI4 (4-fluorophenethylammonium, F-PEA). The density functional theory (DFT) simulation and experimental results show that the inorganic framework distortion results in a bandgap reduction. It was found that the exciton-optical phonon coupling and free excitons (FEs) binding energy are minimized at 2.75 GPa shock pressure due to a reduction in dielectric confinement. The stability testing under various harsh light and humid thermal conditions shows that femtosecond laser shocking improves the stability of (F-PEA)2PbI4 PSCs. Femtosecond laser shock processing provides a new approach for regulating the structure and enhancing halide perovskite properties.

scholarly journals Experimental determination of noble gases and SF6, as tracers of CO2 flow through porous sandstone

2018 ◽  
Vol 480 ◽  
pp. 93-104 ◽  
Author(s):  
R. Kilgallon ◽  
S.M.V. Gilfillan ◽  
K. Edlmann ◽  
C.I. McDermott ◽  
M. Naylor ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Noble Gases ◽  
Porous Sandstone ◽  
Flow Through ◽  
Co2 Flow
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