Journal of Nondestructive Evaluation
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A Numerical Study on Interlaminar Defects Characterization in Fibre Metal Laminates with Flying Laser Spot Thermography
Journal of Nondestructive Evaluation - - 2018
This work describes a numerical study on non-destructive evaluation of interlayer disbond defects in aerospace grade Fibre Metal Laminate sheets (FMLs). A recently proposed infrared non-destructive testing setup is considered, where a continuous laser is moved over the material surface, while the thermal footprint of the moving heat source is acquired, e.g. by an infrared thermal camera. Interlaye...... hiện toàn bộ
Machine Learning Based Preprocessing to Ensure Validity of Cross-Correlated Ultrasound Signals for Time-of-Flight Measurements
Journal of Nondestructive Evaluation - Tập 40 - Trang 1-9 - 2021
High precision ultrasonic time-of-flight measurement is a well known part of non-destructive evaluation used in many scientific and industrial applications, for example stress evaluation or defect detection. Although ultrasonic time-of-flight measurements are widely used there are some limitations where high noise and distorted ultrasonic signals are conflicting with the demand for high precision ...... hiện toàn bộ
A New Micro Magnetic Bridge Probe in Magnetic Flux Leakage for Detecting Micro-cracks
Journal of Nondestructive Evaluation - Tập 37 - Trang 1-9 - 2018
Magnetic flux leakage (MFL) testing has been widely used as an efficient non-destructive testing method to detect damage in ferromagnetic materials. It’s of great importance to improve the testing capability of MFL sensors. In this paper, a micro magnetic bridge method in MFL of high sensitivity is proposed to detect micro-cracks. This method consists of a micro magnetic bridge core and an inducti...... hiện toàn bộ
Induced Magnetic Field Used to Detect the Sigma Phase of a 2205 Duplex Stainless Steel
Journal of Nondestructive Evaluation - - 2016
An Efficiency Study of Transient Wave Generation in a Thermoelastic Layer with a Pulsed Laser
Journal of Nondestructive Evaluation - Tập 20 - Trang 49-59 - 2001
The efficiency of transient wave generation in a thermoelastic silicon layer excited by a pulsed laser is considered. First a principle-based transfer matrix formulation with relaxation effect, also referred to as the generalized dynamic theory of linear thermoelasticity, is used in obtaining transfer functions between the input heat field and the elements of the thermoelastic state vector. The se...... hiện toàn bộ
Transducer-modeling in general transversely isotropic media via point-source-synthesis: Theory
Journal of Nondestructive Evaluation - Tập 13 - Trang 85-99 - 1994
Based on a theory of elastic wave propagation in arbitrarily oriented transversely isotropic media, which has been presented recently, the radiation characteristics of ultrasonic transducers in these media are determined. Using the directivity patterns for normal and transverse point sources on the free surface of such (semi-infinite) materials—the derivation is based on the reciprocity theorem—th...... hiện toàn bộ
A Taguchi Design of Experiment Approach to Pulse and Lock in Thermography, Applied to CFRP Composites
Journal of Nondestructive Evaluation - Tập 36 - Trang 1-11 - 2017
The current text presents a parametric study of two active thermography routines namely, Pulse and Lock-in as applied to carbon fiber reinforced plastics (CFRP) composites; using a Taguchi design of experiment approach. A set of controllable factors are highlighted and selected for each technique at different levels. Three factors have been identified for the pulse thermography (specifically; defe...... hiện toàn bộ
Quantitative characterization of corrosion under insulation
Journal of Nondestructive Evaluation - Tập 16 - Trang 135-146 - 1997
A method is described to quantitatively characterize the corrosion status of steel samples under insulation. The method uses backscatter X-rays to obtain a density vs. depth profile of the sample, from which the mass absorption coefficient, density, and thickness of the rust layer are evaluated. From these data, the iron content of the rust layer is computed, and the steel losses are expressed in ...... hiện toàn bộ
Modal Parameter Identification of Hagia Sophia Bell-Tower via Ambient Vibration Test
Journal of Nondestructive Evaluation - Tập 28 - Trang 37-47 - 2009
Many of historical structures have degenerated in time by environmental effects, earthquakes, and winds because of the inadequate preservation. The preservation of historical heritage is considered a fundamental issue in the cultural life of modern societies. The protective measures can be supplied if the actual behaviour of the structures is known. The paper presents the results of ambient vibrat...... hiện toàn bộ
Measurement of acoustoelastic coefficients of Rayleigh waves in steel alloys
Journal of Nondestructive Evaluation - Tập 3 - Trang 115-124 - 1982
An ultrasonic technique to determine the acoustoelastic coefficients of Rayleigh waves in steel alloys is described. The technique is based on the measurement of the time of flight of Rayleigh waves over a fixed surface distance as a function of applied stress. Measurements on AISI 1080 carbon steel, AISI 4130 alloy steel, and 316L stainless steel specimens are reported. Time of flight resolution ...... hiện toàn bộ
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