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Stress field

About: Stress field is a research topic. Over the lifetime, 11926 publications have been published within this topic receiving 226417 citations.


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Book
30 Sep 1995
TL;DR: The concept of the Asymptotic Expansions is introduced in this article for modeling cracks and inclusion in Elastic Media Cracks with Smoothly Closed Edges Thin Rectangular Holes Formation of a Griffith's Crack in a Non-uniform Stress Field Generalization of the Novozhilov Problem for Stationary Propagating Cracks State of Stress in a Plane with a Thin Elastic Inclusion Exercises Domains with Conical and Cylindrical Boundaries Stress-Strain State in a Neighbourhood of Conical Inclusions and Cavities As
Abstract: Preface Introduction Equations of Linear Elasticity Cracks and Inclusions The Polya-Szego Matrix The Concept of the Asymptotic Expansions Exercises Modelling of Cracks and Thin Inclusions in Elastic Media Cracks with Smoothly Closed Edges Thin Rectangular Holes Formation of a Griffith's Crack in a Nonuniform Stress Field Generalization of the Novozhilov Problem for Stationary Propagating Cracks State of Stress in a Plane with a Thin Elastic Inclusion Exercises Domains with Conical and Cylindrical Boundaries Stress-Strain State in a Neighbourhood of Conical Inclusions and Cavities Asymptotics of Singularity Exponents at the Tip of an Angular Crack Equations of Linear Elasticity in Thin Domains Asymptotic Analysis of the Longitudinal Jump in Adhesively Bonded Joints Lekhnitskii's Problems Asymptotic Interpretation of Solutions to Lekhnitskii's Problem Exercises Stress-Strain State in the Vicinity of Sharp Inclusions Asymptotic Behaviour of the Stress-Strain State in the Vicinity of Sharp Defects in an Elastic Body On the Stress Concentration Near Soft and Rigid Cusp-Shaped Inclusions Exercises Integral Characteristics in Elasticity Problems for Nonhomogeneous Bodies Integral Characteristics of Elastic Inclusions and Cavities in Two-Dimensional Theory of Elasticity Vibration of Elastic Solids with Small Holes Quasistatic Interaction of a Crack with Small Defects Exercises Appendix References Index

76 citations

Book ChapterDOI
TL;DR: In this article, a detailed analysis of the magnitude and orientation of all three principal stresses in a number of oil and gas fields in the northern North Sea was performed to investigate how faults affect the migration of fluids in petroleum reservoirs.
Abstract: To investigate the question of how faults affect the migration of fluids in petroleum reservoirs, we evaluated the state of stress and pore pressure acting on the major faults in four oil and gas fields in the northern North Sea. Many of the faults bound hydrocarbon reservoirs. Our goal was to test the hypothesis that faults that are being reactivated in the current stress field are permeable and thus tend to leak, whereas those that are not (i.e. faults that are inactive in the current stress field) are likely to seal. To address this question, we utilize a detailed analysis of the magnitude and orientation of all three principal stresses in a number of wells in each field. These data, along with information on pore pressure, allowed us to resolve the shear and effective normal stress acting on distinct 100 m × 100 m elements of individual fault planes. By comparing the stress state resolved on each fault element to expected stress at failure (using a Coulomb failure criterion) we created color-shaded maps showing the proximity to fault slip (and hence leakage) along each fault. Fault reactivation and hydrocarbon leakage in this area appears to be caused by three factors: (1) locally elevated pore pressure due to buoyant hydrocarbons in reservoirs abutting the faults, (2) fault orientations that are nearly optimally oriented for frictional slip in the present-day stress field, and (3) a relatively recent perturbation of the compressional stress caused by postglacial rebound. We demonstrate that the combination of these three factors may have recently induced fault slippage and gas leakage along sections of previously sealing reservoir-bounding faults in some fields, whereas in others, the stress and pore pressure are not sufficient to cause fault reactivation. We show that only in cases where reservoir-bounding faults are not potentially active, the pore-pressure difference across faults can become quite high. Hence, the leakage potential of reservoir-bounding faults appears to exert an important influence on potential hydrocarbon column heights.

76 citations

Journal ArticleDOI
TL;DR: In this paper, the suitability of the linear and polynomial cohesive laws in predicting hydrogen induced stress cracking was investigated by applying models of U and V-notched tensile specimens representing a 25%Cr duplex stainless steel component submerged in sea water under cathodic protection.

76 citations

Journal ArticleDOI
TL;DR: In this article, a well-posed stress-driven mixture is proposed for Timoshenko nano-beams, which is a convex combination of local and nonlocal phases and circumvents some problems of ill-posedness emerged in strain-driven Eringen-like formulations for structures of nanotechnological interest.
Abstract: A well-posed stress-driven mixture is proposed for Timoshenko nano-beams. The model is a convex combination of local and nonlocal phases and circumvents some problems of ill-posedness emerged in strain-driven Eringen-like formulations for structures of nanotechnological interest. The nonlocal part of the mixture is the integral convolution between stress field and a bi-exponential averaging kernel function characterized by a scale parameter. The stress-driven mixture is equivalent to a differential problem equipped with constitutive boundary conditions involving bending and shear fields. Closed-form solutions of Timoshenko nano-beams for selected boundary and loading conditions are established by an effective analytical strategy. The numerical results exhibit a stiffening behavior in terms of scale parameter.

76 citations

01 Dec 2011
TL;DR: In this article, the authors analyzed 118 well-constrained focal mechanisms to estimate the pore fluid pressure field of the stimulated region during the fluid injection experiment in Basel, Switzerland.
Abstract: [1] We analyzed 118 well-constrained focal mechanisms to estimate the pore fluid pressure field of the stimulated region during the fluid injection experiment in Basel, Switzerland. This technique, termed focal mechanism tomography (FMT), uses the orientations of slip planes within the prevailing regional stress field as an indicator of the fluid pressure along the plane at the time of slip. The maximum value and temporal change of excess pore fluid pressures are consistent with the known history of the wellhead pressure applied at the borehole. Elevated pore fluid pressures were concentrated within 500 m of the open hole section, which are consistent with the spatiotemporal evolution of the induced microseismicity. Our results demonstrate that FMT is a robust approach, being validated at the meso-scale of the Basel stimulation experiment. We found average earthquake triggering excess pore fluid pressures of about 10 MPa above hydrostatic. Overpressured fluids induced many small events (M < 3) along faults unfavorably oriented relative to the tectonic stress pattern, while the larger events tended to occur along optimally oriented faults. This suggests that small-scale hydraulic networks, developed from the high pressure stimulation, interact to load (hydraulically isolated) high strength bridges that produce the larger events. The triggering pore fluid pressures are substantially higher than that predicted from a linear pressure diffusion process from the source boundary, and shows that the system is highly permeable along flow paths that allow fast pressure diffusion to the boundaries of the stimulated region.

76 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023245
2022517
2021392
2020416
2019410
2018388