Play Fairway analysis of geothermal resources across the State of Hawai‘i: 4. Updates with new groundwater chemistry, subsurface stress analysis, and focused geophysical surveys

Geothermics ◽  
2020 ◽  
Vol 86 ◽  
pp. 101798
Author(s):  
Nicole Lautze ◽  
Garrett Ito ◽  
Donald Thomas ◽  
Neil Frazer ◽  
Stephen J. Martel ◽  
...  
Keyword(s):  
Stress Analysis ◽  
The State ◽  
Groundwater Chemistry ◽  
Geothermal Resources ◽  
Geophysical Surveys ◽  
Subsurface Stress

scholarly journals Seismic Methods in Geothermal Water Resource Exploration: Case Study from Łódź Trough, Central Part of Poland

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Tomasz Maćkowski ◽  
Anna Sowiżdżał ◽  
Anna Wachowicz-Pyzik
Keyword(s):  
Estimation Error ◽  
Geophysical Methods ◽  
Petroleum Industry ◽  
Geological Structure ◽  
Seismic Survey ◽  
Energy Potential ◽  
Geothermal Resources ◽  
Geothermal Waters ◽  
Seismic Methods ◽  
Geophysical Surveys

The geothermal waters constitute a specific type of water resources, very important from the point of view of their thermal energy potential. This potential, when utilized, supplies an ecological and renewable energy, which, after effective development, brings many environmental, social, and industrial benefits. The key element of any geothermal investment is the proper location of geothermal installation, which would guarantee the relevant hydrogeothermal parameters of the water intake. Hence, many studies and analyses are carried out in order to characterize the reservoir parameters, including the integrated geophysical methods. For decades, the geophysical surveys have been the trusty recognition methods of geological structure and petrophysical parameters of rock formations. Thus, they are widely applied by petroleum industry in exploration of conventional and unconventional (shale gas/oil, tight gas) hydrocarbon deposits. Advances in geophysical methods extended their applicability to many other scientific and industrial branches as, e.g., the seismic survey used in studies of geothermal aquifers. The following paper presents the opportunities provided by seismic methods applied to studies of geothermal resources in the central Poland where the geothermal waters are reservoired in both the Lower Cretaceous and the Lower Jurassic sedimentary successions. The presented results are obtained from a network of seismic profiles. An important advantage of the seismic survey is that they may support the selection of an optimal location of geothermal investment and determination of the geometry of geothermal aquifer. Furthermore, the application of geophysical methods can significantly contribute to the reduction of estimation error of groundwater reservoir temperature.

A STUDY ON THE STRUCTURAL STRESS ANALYSIS OF PLASTIC ANKLE FOOT ORTHOSIS (AFO) UNDER DORSIFLEXION AND PLANTARFLEXTION CONDITIONS

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4559-4564 ◽  
Author(s):  
YOUNG-SHIN LEE ◽  
YOUNG-JIN CHOI ◽  
HYUN-SOO KIM ◽  
HYUN-SEUNG LEE ◽  
KANG-HEE CHO
Keyword(s):  
Stress Analysis ◽  
Structural Characteristics ◽  
The State ◽  
Structural Stress ◽  
Ankle Foot Orthosis ◽  
Design Guide ◽  
Foot Orthosis

The ankle foot orthosis (AFO) is used as the gait assistive tool for hemiplegic patients. The structural characteristics of the AFO are applied to the state of the patient. However, the prescription guide for hemiplegic patients is not well established. The purpose of this study is to develop design guide to find out the structural characteristics of polypropylene of AFO used for hemiplegics. In this study, the rigidities of dorsiflexion and plantarflexion of the AFO with varied types of ankle widths are investigated and performed by using FEM code.

X-Ray Stress Analysis of Nickel-Plated Components Using Different Radiation Wavelengths

1985 ◽  
Vol 29 ◽  
pp. 49-55 ◽  
Author(s):  
R. H. McSwain ◽  
E. B. S. Pardue ◽  
R. W. Hendricks ◽  
M. V. Mathis
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
The State ◽  
Nickel Plating ◽  
Load Bearing ◽  
X Ray ◽  
Stress Gradients ◽  
State Of Stress ◽  
Stress Analyses

X-ray stress analyses were performed on seven (7) nickel-plated camshafts from helicopter transmissions. The purpose of this investigation was to determine if this residual stress technique was useful in determining the state of stress in load-bearing plated surfaces of critical reworked aircraft components. Specifically, it was desired to characterize six different stages of nickel plating processing. These were: as-plated, plated and baked, machined, machined and baked, ground, and ground and baked. Three different radiation wavelengths with different penetrations were used In this investigation. CrKα , CoKα , and CuKα, radiations were each used on all of the camshafts. These wavelengths were selected to determine if there were stress gradients in the plated layers. This paper presents and discusses the results of these studies.

Analysis and Results of an SCS-6/Ti-15-3 MMC Reinforced Ring Structure Under Internal Radial Loading

1993 ◽  
Author(s):  
Phillip W. Gravett ◽  
Robert E. deLaneuville
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Finite Element Model ◽  
Stress Analysis ◽  
Ultimate Strength ◽  
Element Model ◽  
Ring Structure ◽  
The State ◽  
Stress Concentrations ◽  
State Of Stress

Abstract This paper presents a stress analysis method and test results of a ring structure reinforced with SCS-6/Ti-15-3 MMC under an applied internal radial load. To assess the structural integrity of an MMC reinforced component, the state of stress within the component must be determined. Two major factors complicating the state of stress in the given MMC reinforced rings are the stress concentrations caused by the load fixture and the thermal residual stresses induced during processing. To model the stress concentrations, the ring and its load fixture were modeled as a 3-d solid finite element model. To calculate the processing residual stresses, a 2-d axisymetric finite element thermal stress analysis was completed. Plasticity was modeled with the 2-d axisymetric finite element model accounting for the nonlinear response of the MMC core and monolithic sheath. Testing of the rings at room and high temperature showed good correlation to load-deflection calculations while ultimate strength was far less than predicted. Subsequent post failure analysis revealed preexisting damage within the MMC which was not detected by pretest NDE inspections. This damage did not significantly affect the measured stiffness of the ring, but diminished the ultimate strength by reducing the capability of the MMC in a localized area.

A State-Space-Based Stress Analysis of a Multilayered Spherical Shell With Spherical Isotropy

2000 ◽  
Vol 68 (1) ◽  
pp. 109-114 ◽  
Author(s):  
W. Q. Chen ◽  
H. J. Ding
Keyword(s):  
Spherical Shell ◽  
Stress Analysis ◽  
Matrix Theory ◽  
Three Dimensional ◽  
The State ◽  
State Variables ◽  
State Equations ◽  
Independent State ◽  
Spherical Isotropy ◽  
Constant Coefficients

This paper presents an exact static stress analysis of a multilayered elastic spherical shell (hollow sphere) completely based on three-dimensional elasticity for spherical isotropy. Two independent state equations are derived after introducing three displacement functions and two stress functions. In particular, a variable substitution technique is used to derive the state equations with constant coefficients. Matrix theory is then employed to obtain the relationships between the state variables at the upper and lower surfaces of each lamina. By virtue of the continuity conditions between two adjacent layers, a second-order linear algebraic equation and a fourth-order one about the boundary variables at the inner and outer surfaces of a multilayered spherical shell are obtained. Numerical examples are presented to show the effectiveness of the present method.

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