... to the applied load. (ii) Crack velocity can be determined without the crack length measurement. (iii) Specimen pre-cracking can be done easily. However, the DT test has some limitations. First it only can be applied to mode I loading. Second, it does not always produce a unique K-v relation for a given material...

... ABSTRACT: This paper consists of a series of attempts and discussions on the data analysis approaches to investigate and extract the asymptotic features in the rock fracture process. The rock fracture discussed here were under mode-I and mixed-mode loadings. We examine the process of creating...

... ABSTRACT As an alternative to overcome safety challenges associated with conventional drilling riser, freestanding drilling riser (FSDR) is disconnectable and the longer riser is left in freestanding mode. A comparative study of FSDR system from connected mode to freestanding mode to ensure...

... in the literature. This paper presents the Mode I and Mode II fracture toughness (K Ic and K IIc ) of Montney shale. The material properties could be used for further analysis and numerical simulation. K Ic and K IIc are measured using the semi-circular bending method (SCB) and double shear method (DS...

... compressive strength Riemann solution effective stress model mohr-coulomb effective stress model mc effective stress model fracture wellbore integrity stress model fracture strength loading crack propagation traction interface ARMA 17-0679 Mixed-mode dynamic crack propagation in rocks...

... energy dissipation during slipping, which can be characterised by a viscous damping ratio. This stick-slip damping is mode number and mode amplitude dependent and can significantly influence umbilical VIV fatigue life prediction. Methods to incorporate stick-slip damping in prediction methods has been...

...EXPERIMENTAL AND NUMERICAL ANALYSIS TO DETERMINE THE TRANSITION FROM MODE-I TO MODE-II FRACTURE *A. K. Verma, Rajabrahma K., Rakesh Kumar, and V. Mukesh Dept. of Mining Engineering Indian Institute of Technology Kharagpur India 721 302 (*Corresponding author: abhiram.verma@gmail.com) Innovations...

... Summary A baseline 3D VSP survey at the Aquistore CO2 storage site in Saskatchewan served as a technology test for distributed acoustic sensing (DAS). DAS data was acquired as a vertical seismic profile (VSP) on two codeployed fibers, one single-mode (SM) and one multi-mode (MM...

... creep deformation and perhaps in the production of a disturbed rock zone (DRZ) characterized by microfractures. The stress conditions required for crack propagation are described by the material fracture toughness. Mode I (tensile) and mode II (shear) fracture toughness values were obtained for WIPP...

... Abstract: Presented in this paper will be the background, the technique and the testing results when using the (Cracked Chevron-Notched Brazilian Disc (CCNBD) specimen for rock Mode 1 K1c, Mode II K11c and mixed mode fracture strength locus testing. Resume: Dans cet article bous considerons...

... ABSTRACT INTRODUCTION Recent experiments have shown that both Mode I and Mode II fracture propagation can occur in brittle materials such as rocks. In uniaxial compressive tests Petit and Barquirts [ 1 ] observed shear fractures extending from an inclined flaw in sandstone specimens; Reyes...

...Proceedings of the Third (1993) International Offshore and Polar Engineering Conference Singapore, 6-11 June 1993 Copyright © 1993 by The International Society of Offshore and Polar Engineers ISBN 1-880653-05-2 (Set); ISBN 1-880653-09-5 (Vol IV) Effect of Mode I and Mode II Loading on Behavior...

... ABSTRACT: An experimental research program, designed to detect acoustic emissions (AE) produced during propagation of discrete Mode I and Mode II fractures in large rock specimens, is underway at the Rock Mechanics Laboratory at The University of Texas at Austin. Equipment developed...

... ABSTRACT ABSTRACT: Experimental work is conducted to detect acoustic emissions produced during propagation of discrete Mode I and Mode II fractures in large rock specimens. Equipment developed is described in detail. Preliminary results of testing granite and dolostone rock specimens...

... Abstract Most MWD systems use Mud Pulse (MP) or Electro Magnetic (EM) telemetry. Each telemetry system has very specific applications and limitations due to the governing physics. The Hybrid-Mode Telemetry of MP and EM in one system widens the operational envelope and increases drilling...

... Abstract This paper investigates the drill pipe twist-offs that occurred while drilling an S-shaped well in the 12 ¼" section. The presence of the 2nd mode shape of torsional vibration was observed and linked to the failure. Conditions that lead to a 2nd mode shape being triggered and sustained...

... Abstract The problem of effective oil reservoir managing becomes quite challenging during the late stages of its production. That's why, going for the intermittent operational mode is typical use-case for low-rate wells with electrical submersible pump since it's more efficient from both...

... We propose a new diffraction-separation method that uses a geometry mode decomposition (GMD) algorithm to remove reflections and separate diffractions in the common-offset or poststack domain. The key idea of this method is based on the fact that, in the frequency– wavenumber ( f – k ) domain...

... The time domain electromagnetic method using magnetic source and electrical source in borehole is studied by numerical simulation. The results show that the borehole time-domain electromagnetic measurement through the magnetoelectric mixed emission and reception mode can effectively solve...