Late Pliocene–Pleistocene stress field in the Teruel and Jiloca grabens (eastern Spain): contribution of a new method of stress inversion

2005 ◽  
Vol 27 (4) ◽  
pp. 693-705 ◽  
Author(s):  
L.E. Arlegui ◽  
J.L. Simón ◽  
R.J. Lisle ◽  
T. Orife
Keyword(s):  
Stress Field ◽  
New Method ◽  
Stress Inversion ◽  
Late Pliocene

Transient Response of an Interface-Crack in a Layered Plate

1986 ◽  
Vol 53 (3) ◽  
pp. 579-586 ◽  
Author(s):  
T. Kundu
Keyword(s):  
Stress Field ◽  
Interface Crack ◽  
Transient Response ◽  
Singular Integrals ◽  
Fortran Program ◽  
Numerical Results ◽  
New Method ◽  
Layered Plate ◽  
Improved Method ◽  
Sample Problem

In this paper, the transient response of an interface crack, in a two layered plate subjected to an antiplane stress field, is analytically computed. The problem is formulated in terms of semi-infinite integrals following the technique developed by Neerhoff (1979). It has been shown that the major steps of Neerhoff’s technique, which was originally developed for layered half-spaces, can also be applied to layered plate problems. An improved method for manipulation of semi-infinite singular integrals is also presented here. Finally, the new method is coded in FORTRAN program and numerical results for a sample problem are presented.

Linear Static, Real-Time Finite Element Computations Based on Element Masks

2011 ◽  
Author(s):  
Holger Graf ◽  
Andre´ Stork
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Boundary Conditions ◽  
Real Time ◽  
Stiffness Matrix ◽  
New Method ◽  
Stress Distributions ◽  
Post Processing ◽  
Time Performance ◽  
Computational Overhead

This paper presents a new method for the manipulation of a given CAE domain in view of VR based explorations that enables engineers to interactively inspect and analyze a linear static domain. The interactions can ideally be performed in real-time in order to provide an intuitive impression of the changes to the underlying volumetric domain. We take the approach of element masking, i.e. the blending out of computations resulting from computational overhead for inner nodes, based on the inversion of the stiffness matrix. This allows us to optimize the re-simulation loop and to achieve real-time performance for strain and stress distributions with immediate visualization feedback caused by interactively changing boundary conditions. The novelty of the presented approach is a direct coupling of view dependent simulations and its close linkage to post-processing tasks. This allows engineers to also inspect the changes of the stress field inside of the volume during, e.g. cross sectioning.

Direct stress field estimation through waveform matching

2020 ◽  
Vol 221 (2) ◽  
pp. 843-856
Author(s):  
Wenhuan Kuang ◽  
Jie Zhang
Keyword(s):  
Stress Field ◽  
Focal Mechanism ◽  
Stress Pattern ◽  
P Wave ◽  
Local Source ◽  
Stress Inversion ◽  
Inversion Process ◽  
Physical Relationship ◽  
New Approach ◽  
Field Estimation

SUMMARY Conventionally, the routine workflow of stress field estimation from seismic data consists of two steps: focal mechanism inversion and stress inversion. This two-step workflow suffers from the cumulative uncertainties of both the focal mechanism inversion process and the stress inversion process. To mitigate the cumulative errors, a few previous studies have put efforts to directly estimate the stress field using P-wave polarities. In this study, we develop a new approach to directly estimate tectonic stress fields with better accuracy through waveform matching. This new approach combines the two steps into a one-step workflow to mitigate the cumulative uncertainties through the physical relationship between a stress field and the recorded waveforms. This method assumes a homogeneous stress field in space in the local source region and that the fault slip occurs in the direction of the resolved shear stress acting on the fault plane. Under these assumptions, the stress pattern that generates the theoretical waveforms that best fit the waveforms observed is directly retrieved as the true stress field. The merits of the new approach include that this approach can mitigate the cumulative uncertainties suffered from the conventional two-step workflow and does not require determination of the focal mechanisms of each event; thus, this method is applicable to data sets with few stations. Synthetic tests with and without noise are conducted to demonstrate the performance and merits of this method. Then, the new approach is applied to a real data set from central Oklahoma between March 2013 and March 2016. The resulting stress pattern is consistent with that estimated from previous studies examining the same region. These applications show the benefits and validity of the new approach.

A New Method to Measure the Microresidual Stress-Field Around Inclusions

1968 ◽  
Vol 90 (4) ◽  
pp. 620-622 ◽  
Author(s):  
L. B. Gulbransen ◽  
S. K. Chatterjee
Keyword(s):  
Free Energy ◽  
Domain Wall ◽  
Stress Field ◽  
Domain Walls ◽  
Manganese Sulfide ◽  
Ferromagnetic Material ◽  
New Method ◽  
The Matrix

A brief review of various theories of interaction of inclusions and domain walls in a ferromagnetic material is presented. A postulate concerning the modification of domain patterns by inclusions, based on theory, is described and the various free-energy contributions of the inclusion to the matrix in the vicinity of the inclusion are discussed. Examples of domain wall bending in ingot iron by manganese sulfide inclusions are shown to agree with the postulated model of interaction of a stress field around the inclusion and the domain wall.

A New Measuring and Calculating Method for Concrete Thermal Conductivity with Multipoint

2013 ◽  
Vol 671-674 ◽  
pp. 1657-1660
Author(s):  
Sheng Qiang ◽  
Chao Wu ◽  
Nan Nan Zhang ◽  
Zhi Qiang Xie
Keyword(s):  
Thermal Conductivity ◽  
Stress Field ◽  
Thermal Field ◽  
Measuring Method ◽  
New Method ◽  
Mass Concrete ◽  
Calculation Formula ◽  
The Real ◽  
Calculating Method ◽  
Simulation Results

The real thermal parameters always have inevitable influence on the simulation results of the structure thermal field and stress field in the construction of mass concrete. A new measuring and calculation method for concrete thermal conductivity was put forward. Eight or six sensor points measuring method and calculation formula are present, and the latter is the simplification of the former. Comparing the real thermal conductivity with the calculation result by the new method, it can be seen that the thermal conductivity can be obtained within about 6 day’s age at site and with the accurate degree of 98%. The new method will provide an efficient way for the concrete structure researcher and designer.

A New Method for Predicting the Opening Angle for Soft Tissues

2002 ◽  
Vol 124 (4) ◽  
pp. 347-354 ◽  
Author(s):  
Timothy J. Van Dyke ◽  
Anne Hoger
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Field ◽  
Potential Energy ◽  
Biological Tissue ◽  
Soft Tissues ◽  
Element Model ◽  
New Method ◽  
Opening Angle ◽  
Residual Stress Field

The purpose of this paper is to present a simple new method for calculating the opening angle produced by a given residual stress field in a soft biological tissue. The method uses minimization of potential energy, and is therefore named the MPE method. The accuracy of the MPE method is evaluated by comparing the opening angle it predicts to results from a finite element model of the opening angle experiment. We show that the MPE method provides good predictions of the opening angle, and that it is significantly more accurate than two other methods previously used in the literature.

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