Topic
Acoustic emission
About: Acoustic emission is a research topic. Over the lifetime, 16293 publications have been published within this topic receiving 211456 citations.
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TL;DR: In this paper, acoustic emissions data from a series of laboratory hydraulic fracturing experiments on granite were used to understand the effect of external stress conditions on the hydraulic fracturing process and to predict crack initiation.
65 citations
TL;DR: In this paper, the authors present details and results of experimental investigations conducted for characterizing the brittle failure processes induced in a rock due to monocyclic uniaxial compression on loading of two types of sandstone core samples saturated in NaCl brines of varying concentration (0, 2, 5, 10 and 15% NaCl by weight).
Abstract: Acoustic emissions (AE) and stress–strain curve analysis are well accepted ways of analysing crack propagation and monitoring the various failure stages (such as crack closure, crack initiation level during rock failure under compression) of rocks and rock-like materials. This paper presents details and results of experimental investigations conducted for characterizing the brittle failure processes induced in a rock due to monocyclic uniaxial compression on loading of two types of sandstone core samples saturated in NaCl brines of varying concentration (0, 2, 5, 10 and 15 % NaCl by weight). The two types of sandstone samples were saturated under vacuum for more than 45 days with the respective pore fluid to allow them to interact with the rocks. It was observed that the uniaxial compressive strength and stress–strain behaviour of the rock specimens changed with increasing NaCl concentration in the saturating fluid. The acoustic emission patterns also varied considerably for increasing ionic strength of the saturating brines. These observations can be attributed to the deposition of NaCl crystals in the rock’s pore spaces as well some minor geo-chemical interactions between the rock minerals and the brine. The AE pattern variations could also be partly related to the higher conductivity of the ionic strength of the high-NaCl concentration brine as it is able to transfer more acoustic energy from the cracks to the AE sensors.
65 citations
TL;DR: In this article, the authors developed a methodology for the detection and monitoring of damage and fractures in building materials in the prospects of energetic renovation by using digital image correlation (DIC) and acoustic emission (AE) monitoring.
65 citations
TL;DR: In this paper, a function that combines acoustic emission and mechanical information is employed to investigate the initiation of delamination in a glass/epoxy specimen under the mode I delamination.
65 citations
01 Jan 1984
TL;DR: X-Ray Diffraction and Neutron Scattering techniques have been used for non-destructive characterisation of materials properties as discussed by the authors, such as thermal history and Metallurgical condition of a Quenched and aged aluminum Alloy.
Abstract: X-Ray Diffraction and Neutron Scattering Techniques.- X-Rays for Non-Destructive Characterization of Materials Properties.- Application of a Position Sensitive Scintillation Detector to Nondestructive X-Ray Diffraction Characterization of Metallic Components.- Residual Stress Measurements in Ti-6Al-4V and ?-Brass with Sub-Surface Flaws Using X-Ray Diffraction Techniques.- Determination of Residual Stress from Two-Dimensional Diffraction Patterns.- Small Angle Neutron Scattering: An NDE Tool.- Eddy Current and Electrical Conductivity Applications.- Prediction of Laser Irradiated Surface Properties by Eddy Current Method.- Solving for Thermal History and Metallurgical Condition of a Quenched and Aged Aluminum Alloy Through Conductivity and Hardness Properties.- Eddy Current Measurement of Residual Stresses in a Heavy Section Steel Weldment.- Magnetic, Ultrasonic, and Analytical Techniques for Stress and Cold Work Indication.- Solving Internal Stress Measurement Problems by a New Magnetoelastic Method.- Nondestructive Determination of Residual and Applied Stress by Micro-Magnetic and Ultrasonic Methods.- The Need for Analytical/Experimental Orchestrated Approaches to Solve Residual Stress Problems in Real Structures.- Internal Friction of Fe-Based Binary Alloys at High Frequency.- General Ultrasonic Considerations and Applications.- The Inverse Problem in Materials Characterization Through Ultrasonic Attenuation and Velocity Measurements.- Inference of Fatigue Crack Closure Stresses from Ultrasonic Transmission Measurements.- Inference of Compressive Stresses at Joined Interfaces Using Ultrasonic Reflectivity.- Frequency Dependent Properties of Materials Containing a Distribution of Pores and/or Inclusions.- Measurement of Thin Case Depth in Hardened Steel by Untrasonic Pulse-Echo Angulation Techniques.- Ultrasonic Micro Structural Characterization of Crystalline Metals.- Acoustic Emission for In-Process Monitoring and Microstructure Control?.- Use of Ultrasonic Techniques to Assess the Mechanical Properties of Steels.- Determination of Microstructural Parameters by Magnetic and Ultrasonic Quantitative NDE.- Microstructural Characterization of Titanium by Acoustic Microscopy.- Ultrasonic Characterization of Titanium 6211 Weldments.- Measurement of Near-Surface Ultrasonic Absorption by Thermo-Emissivity.- Ultrasonic Characterization of Amorphous Metals, Polymers, and Composites.- Ultrasonic Materials Characterization of Melt Spun Metallic Ribbons.- Application of Ultrasonic Technique to Cure Characterization of Epoxies.- Ultrasonic Measurements of Elastic Moduli of Thermally Cycled Metal Matrix Composite Precursor Wires.- Acousto-Elastic Effect of Stress in Aluminum and Steel.- Effects of Rolled Plate Thickness on Anisotropy, with Application to Acoustic Stress Measurement.- Ultrasonic Shear Wave Measurements of Known Residual Stress in Aluminum.- Rayleigh Wave Measurement of Surface Stresses in Stainless Steel Piping.- Acousto-Elastic Effects in Two Structural Steels.- Relationship Between Stress and Temperature Dependence of Ultrasonic Shear Velocity.- Author Index.
65 citations