2 edition of Measurement of the change in magnetization of rock under uniaxial compression. found in the catalog.
Measurement of the change in magnetization of rock under uniaxial compression.
Joseph Paul Hodych
Written in English
Thesis (M.A.), Dept. of Physics, University of Toronto
|Contributions||West, G. F. (supervisor), Farquhar, R. M. (supervisor)|
|LC Classifications||LE3 T525 MA 1963 H63|
|The Physical Object|
|Number of Pages||93|
The term soft rock is often referred to rock materials with a uniaxial compressive strength (UCS) lower than that of hard rocks and higher than that of soils. A rock material can be classified as a soft rock if it has a uniaxial compressive strength below 20 MPa, determined directly by uniaxial compression . Chapter 1 Tension, Compression, and Shear Introduction analysis of bodies under the action of external force, to determine the internal stress and their deformation 2. mechanical properties of materials: consideration of such things as (compression test are most used for rock and concrete)File Size: KB.
rials Under Tensile Loads” Chapter 3, “Uniaxial Tensile Testing” Chapter 4, “Tensile Testing Equipment and Strain Sensors” Tensile Specimens and Testing Machines Tensile Specimens. Consider the typical ten-sile specimen shown in Fig. 1. It has enlarged ends or shoulders for gripping. The important part of the specimen is the gage. Schmidbauer, E., and N. Petersen, Some magnetic properties of two basalts under uniaxial compression measured at different temperatures, Journal of Geomagnetism and Geoelectricity, 20, –, Schmidbauer, E., and P.W. Readman, Low temperature magnetic properties of .
In this study, P-wave velocity measurements were used to monitor damage evolution during uniaxial strain in controlled compression tests and long-term creep tests. These measurements were performed using sensors in a piezoelectric copolymer of polyvinyl-difluoride, which were placed on both ends of cylindrical rock specimens. A vibrating sample magnetometer (VSM) is commonly used to measure magnetization and coercivity. In this paper, we present a new method to determine magnetization and coercivity of uniaxial magnetic anisotropic materials using a torque magnetometer. To measure magnetization, a sample is saturated along the uniaxial orientation by applying an external magnetic field and then it is rotated by 90°.
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A Two-Component Magnetometer Used to Measure Magnetization Changes of Rock Under Uniaxial Compression Laboratory Redeposition Studies — An Appraisal of Apparatus and Technique Simple, Order-of-Magnitude Rule for Estimating Stray Fields of Ferrous Components in Laboratory ApparatusBook Edition: 1.
A TWO-COMPONENT MAGNETOMETER USED TO MEASURE MAGNETIZATION CHANGES OF ROCK UNDER UNIAXIAL COMPRESSION J.P. HODYCH SUMMARY An astatic magnet system and a parastatic magnet system were used together in a novel configuration which reduced the interaction between the two systems, thus allowing magnetization changes to be measured along two axes of Author: J.P.
Hodych. Characteristics of remanent magnetization of an igneous rock under a uniaxial compression are divided into those of the soft component and those of the hard component. The soft component of remanent magnetization irreversibly decreases with an increase of compression (σ) regardless whether the axis of σ is parallel or parpendicular to the direction of by: Polycrystalline magnetite and rock samples have been subjected to uniaxial compression and stress cycling at room temperature.
The changes in the components of remanent magnetization were recorded continuously as a function of stress, and the changes in direction and total intensity of magnetization were by: an additional remanent magnetization by uniaxial compression in a magnetic field.
Measurements of the influence of uniaxial compression on the intensity and direction of natural magnetizations of different rocks have been made by Graham, Buddington and Balsley ().Cited by: 6.
In this study, rock samples were constructed using the BPM in LS-DYNA. The DEM was combined with the finite element model (FEM) approach to numerically investigate the response of granite material under uniaxial compression loading. Our aim was to calibrate the micro-parameters in a numerical model of granite rock using Size: KB.
Failure Mechanisms of Brittle Rocks under Uniaxial Compression 61 In this paper, the compression test on rock-like specimens with two prefabricated transﬁxion ﬁssures, made by pulling out the embedded metal inserts in the pre-cured period was performed on the servo control uniaxial loading tester.
The inﬂuences. Department of Civil Engineering National Institute of Technology Rourkela – Odisha, India CERTIFICATE This is to certify that the thesis entitled “A STUDY ON MODES OF ROCK FAILURE UNDER UNIAXIAL COMPRESSION” submitted by Mr.
ROHAN BISAI (Roll No. CE) in partial fulfilment of the requirements for the award of Master of Technology Degree in Civil. Engineering Classifications of Rock and Rock Masses. Intact Rock. • Strength classification is based on strength of the rock (compressive strength & modulus of elasticity; Table ) • 5 strength classes: A-E based on the overall rock strength; A = very strong, E = very weak (Table ).
Method D: Elastic Moduli of Intact Rock Core Specimens in Uniaxial Compression. Option A: Temperature Variation— Applies to any of the methods and allows for testing at temperatures above or below room temperature. Suggested Methods for Determining the Uniaxial Compressive Strength and Deformability of Rock Materials PART 1.
SUGGESTED METHOD FOR DETERMINATION OF THE UNIAXIAL COMPRESSIVE STRENGTH OF ROCK MATERIALS 1. SCOPE This method of test is intended to measure the uni- axial compressive strength of a rock sample in the formFile Size: KB. eastern Japan Sea intraplate or interplate convergent zone.
Stress previously applied to a rock specimen is identified in the inelastic strain behavior of the specimen under uniaxial compression by the method used. Natural remanent magnetization of the sample was also measured to get a reference for the orientation of the horizontal stresses.
For uniaxial tests, the displacement is typically held at a constant rate, and displacement and resulting load are recorded. The load is measured by a series of strain gages, or “load cell,” while the displacement can be recorded as displacement of the crosshead, or the beam on which the specimen load frame is Size: KB.
The ISRM () provides a definition of weak rock as rock material that has a uniaxial compressive strength (ci) of less than 20 MPa. The ci of weak rock could fall far below this value, and. It has been established that rock fails in compression by shearing along a ‘failure’ plane oriented at an angle.
with respect to. that is specific for a particular rock. • The M-C linear strength criterion implies that. stays the same regardless of the confining pressure applied. Rock.
for magnetization acquired under uniaxial compression, we first discuss how PRM and SRM may be acquired by and preserved in SD grains according to Néel theory [Néel, ]. We then discuss the acquisition and preservation of these remanences in MD grains. Single‐Domain SamplesCited by: Polycrystalline magnetite and rock samples have been subjected to uniaxial isothermal compression to failure in an attempt to see whether any magnetic expression of dilatancy could be observed.
The change in magnetic susceptibility, remanent moment and total moment were recorded continuously as a function of increasing compression. Changes in the slopes of the magnetization Cited by: These test methods cover the determination of the strength of intact rock core specimens in uniaxial and triaxial compression.
The tests provide data in determining the strength of rock, namely: the uniaxial strength, shear strengths at different pressures and different elevated temperatures, angle of internal friction, (angle of shearing resistance), and cohesion intercept.
the failure may involve the intact rock only, the discontinuities only, or may be mixed and involve both the intact rock and the discontinuities. TESTING OF INTACT ROCK FOR STRENGTH Uniaxial Compression Recall the typical stress strain response curve for a specimen of intact rock under uniaxial compression (see Figure 1 in Lecture Notes 5).File Size: KB.
DEFORMABILITY OF INTACT ROCK Rock under Uniaxial Compression Consider a rock specimen subjected to uniaxial compression. Let,a and,l be the axial and lateral (diametral) strains measured during the test and F be the applied axial stress.
Figure 1 shows a typical set of stress-strain response curves. The plot can be divided into four. Deformation behaviour of rocks under compression and direct tension Goffi4 developed a test unit in which the rock sample to be tested is connected with a joint. Stimpson and Chen14 carried out their tests on rock samples having a special hollow cylinder geometry.
Okubo and Fukui17 conducted their direct.A cylindrical capacitor displacement sensor was fixed on the upper platen and used to measure the displacement of the rock specimen in the test.
(2) Rock sample with electrical conductivity: As shown Fig. 1, the cylindrical sample of rock is 50 mm in diameter and mm in by: The determination of uniaxial compressive strength (UCS) is central to most mining and geotechnical engineering analyses and designs in rock engineering. Direct measurement of UCS through uniaxial.