scholarly journals A three-dimensional stochastic rock mechanics model of engineered geothermal systems in fractured crystalline rock

2000 ◽  
Vol 105 (B10) ◽  
pp. 23663-23679 ◽  
Author(s):  
Z. Jing ◽  
J. Willis-Richards ◽  
K. Watanabe ◽  
T. Hashida
Keyword(s):  
Rock Mechanics ◽  
Three Dimensional ◽  
Crystalline Rock ◽  
Geothermal Systems ◽  
Mechanics Model ◽  
Engineered Geothermal Systems

Stress and rock mechanics issues of relevance to HDR/HWR engineered geothermal systems: review of developments during the past 15 years

Geothermics ◽  
1999 ◽  
Vol 28 (4-5) ◽  
pp. 455-474 ◽  
Author(s):  
Keith F Evans ◽  
François H Cornet ◽  
Toshiyuki Hashida ◽  
Kazuo Hayashi ◽  
Takatoshi Ito ◽  
...  
Keyword(s):  
Rock Mechanics ◽  
Geothermal Systems ◽  
The Past ◽  
Engineered Geothermal Systems

Hydraulic stimulation and fluid circulation experiments in underground laboratories: Stepping up the scale towards engineered geothermal systems

2020 ◽  
Vol 24 ◽  
pp. 100175 ◽  
Author(s):  
Valentin S. Gischig ◽  
Domenico Giardini ◽  
Florian Amann ◽  
Marian Hertrich ◽  
Hannes Krietsch ◽  
...  
Keyword(s):  
Geothermal Systems ◽  
Fluid Circulation ◽  
Hydraulic Stimulation ◽  
Engineered Geothermal Systems

BONE BIOMECHANICAL MODELING BASED ON CELLULAR STRUCTURE: METHODS AND EVALUATION

2015 ◽  
Vol 15 (06) ◽  
pp. 1540046 ◽  
Author(s):  
MONAN WANG ◽  
SHUFENG WANG ◽  
XIANJUN AN
Keyword(s):  
Cellular Structure ◽  
Geometric Model ◽  
Three Dimensional ◽  
Biomechanical Model ◽  
Bone Modeling ◽  
Transverse Strain ◽  
Test Results ◽  
Cellular Mechanics ◽  
Compression Load ◽  
Mechanics Model

The aim of this study is to establish a biomechanical model of bone on the basis of cellular structure and then to evaluate its accuracy for the clinical application. The thighbone of swine was scanned by computed tomography (CT). The resulting sectional images were input into MIMICS10.01 to generate a three-dimensional geometric model. A biomechanical model of bone was built on the basis of cellular structure, and calculations of the model were implemented in MATLAB with the finite element method. With this cellular mechanics model, axial compression load was simulated, and load–axial and load–transverse strain at the measurement points were detected. To evaluate the model, a mechanics model derived from an empirical formula was simulated under the same conditions, and an actual biomechanical experiment was also conducted. The simulated results obtained from the two models were then compared with the test results, indicating that the simulated results for the cellular model were closer to the test results than those for the empirical mechanics model. Therefore, the proposed cellular mechanics model shows advantages in accuracy and scope of application for bone modeling.

Evaluation of Engineered Geothermal Systems as a Heat Source for Oil Sands Production in Northern Alberta

2013 ◽  
Vol 23 (2) ◽  
pp. 247-265 ◽  
Author(s):  
V. Pathak ◽  
T. Babadagli ◽  
J. A. Majorowicz ◽  
M. J. Unsworth
Keyword(s):  
Heat Source ◽  
Oil Sands ◽  
Geothermal Systems ◽  
Northern Alberta ◽  
Engineered Geothermal Systems

A Reassessment of PWR Pressure Vessel Integrity During Overcooling Accidents, Considering 3-D Flaws

1984 ◽  
Vol 106 (4) ◽  
pp. 375-382 ◽  
Author(s):  
R. D. Cheverton ◽  
D. G. Ball
Keyword(s):  
Finite Length ◽  
Three Dimensional ◽  
Crack Arrest ◽  
Mechanics Model ◽  
Pressurized Thermal Shock ◽  
Maximum Crack ◽  
Vessel Integrity ◽  
Thermal Shock Problem ◽  
Arrest Toughness ◽  
Plate Type

A continuing analysis of the pressurized-thermal-shock problem associated with PWR postulated overcooling accidents indicates that the previously accepted degree of conservatism in the fracture-mechanics model needs to be more closely evaluated, and, if excessive, reduced. One feature that was believed to be conservative was the use of two-dimensional as opposed to finite-length (three-dimensional) flaws. The degree of conservatism could not be adequately investigated because of computational limitations and a lack of knowledge regarding flaw behavior; however, that situation has changed to the extent that some cases involving finite-length flaws can be studied. A flaw of particular interest is one that is located in an axial weld of a plate-type vessel. For those vessels that suffer relatively high-radiation damage in the welds, the length of the flaw will be no greater than the length of the weld, and recent calculations indicate that a deep flaw of that length (∼2 m) is not effectively infinitely long, contrary to previous thinking. The benefit to be derived from consideration of the 2-m flaw and also a semi-elliptical flaw with length-to-depth ratio of 6/1 was investigated by analyzing several postulated transients. In doing so the sensitivity of the benefit to a specified maximum crack-arrest toughness and to the duration of the transient was investigated. Results of the analysis indicate that for some conditions the benefit in using the 2-m flaw is substantial, but it decreases with increasing pressure, and above a certain pressure there may be no benefit, depending on the duration of the transient and the limit on crack-arrest toughness.

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