Results 251 to 260 of about 114,728,006 (313)

Analysis and modelling of holographic measurements of In Situ stress

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1988
Holographic in situ stress measurements were made at five azimuths at a single depth in a horizontal borehole in a mine pillar. For the first time, all six components of the stress tensor were determined by this technique. The stressmeter data indicate a vertical stress of −10.2MPa (compressive), in good agreement with the predicted vertical stress for
Smither, C. L., Schmitt, D. R., Ahrens, T. J.   +2 more
openaire   +2 more sources

Uniaxial stress in-situ measurement using EMAT shear and longitudinal waves: Transducer design and experiments

, 2021
As a typical stressed state, uniaxial stress widely exists in the components, such as bolt stress, which requires to be tested in-situ regularly. In this article, the uniaxial stress in-situ measurement using the electromagnetic acoustic transducer (EMAT)
Hai-Bo Liu, Tian-Ran Liu, Ya-Peng Li, Yan-Kun Liu, Xiang Zhang, Yongqing Wang, Si-Jia Gao   +6 more
semanticscholar   +1 more source

In‐Situ Stress Measurements in Singapore

Chinese Journal of Geophysics, 2012
AbstractIn the year 2008 and 2009, in‐situ stresses were measured in 18 boreholes by the hydraulic fracturing method to determine the present‐day stress state of the shallow crust in Singapore, which provide key parameters for the design and construction of underground tunnels and data for the study of world stress environments.
openaire   +1 more source

In Situ Stress Measurements in Italy

1980
Most of the in situ natural state-of-stress measurements have been carried out in Italy at the sites of large underground hydroelectric powerhouses and at the sites of important mines. The method successfully used was in all cases based on the measurement of the deformations caused by the stress release on the bottom of boreholes.
Sandro Martinetti, Renato Ribacchi
openaire   +1 more source

The in situ measurement of the intrinsic stresses in nanofilms

Nanotechnologies in Russia, 2010
A method for the in situ measurement of intrinsic stresses in nanofilms is described. It is based on measuring the cantilever beam deflection during the vacuum deposition of thin films. Magnetron sputter deposition is used in this work. In order to determine the cantilever beam deflection, the capacity of a capacitor composed of a stationary plate ...
G. P. Egorov, A. A. Volkov, A. L. Ustyuzhaninov   +2 more
openaire   +1 more source

Deep in-situ stress measurements by hydrofracturing

Tectonophysics, 1975
Abstract Hydrofracturing is a recently developed in-situ stress-measuring method. It consists of hydraulically pressurizing a sealed-off interval inside of a borehole until fracture initiates. The fracture is then extended by additional pumping of fluids from the surface.
openaire   +2 more sources

In-Situ and Ex-Situ Measurement of Stresses in Environmental Barrier Coatings

Volume 2: Ceramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels
Abstract Ceramic Matrix Composites (CMCs) offer a step improvement in temperature capability over the current best high temperature super alloys for gas turbine applications. Silicon Carbide (SiC) based CMCs react with water vapor at temperature and therefore need an Environmental Barrier Coating (EBC) for protection against the water ...
Hans Hudyncia, Jun Shi, Weizhou Li, Xiaodong Li   +3 more
openaire   +1 more source

In-situ stress measurements of sputtered multilayers

SPIE Proceedings, 2010
The mechanical stress induced during the growth of thin films and multilayers is a critical parameter for the fabrication of reflective x-ray optical elements. Strong stress can cause deformation of the optical surface, de-lamination of the respective coating, or even breaking of the underlying substrate. In order to characterize stress in a growing
Ch. Morawe, J.-Ch. Peffen, K. Friedrich
openaire   +1 more source

17. Measurement of in situ Stress

1987
Publisher Summary The state of stress in situ is the result of the superposition of a number of stress fields. This chapter describes the major methods of in situ stress measurement. They have been arranged in three groups: surface, near-surface, and deep methods. Surface measurements of in situ stress are those conducted directly on the free surface
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In-Situ Stress Measurements During Drilling

Journal of Petroleum Technology, 1986
Summary This paper describes the results of six microfracturing experiments in a gas well in south Texas. The experiments were conducted in open hole and during the drilling operations. Microfracturing consisted of pumping very small volumes of drilling mud (tens of gallons) at very low rates (3 to 30 gal/min [189 ...
A.A. Daneshy, G.L. Slusher, P.T. Chisholm, D.A. Magee   +3 more
openaire   +1 more source