contributor author | Ma, Zhiyuan | |
contributor author | Lin, Li | |
contributor author | Jin, Shijie | |
contributor author | Lei, Mingkai | |
date accessioned | 2019-06-08T09:28:58Z | |
date available | 2019-06-08T09:28:58Z | |
date copyright | 1/22/2019 0:00 | |
date issued | 2019 | |
identifier issn | 2572-3901 | |
identifier other | nde_002_01_011008.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4257643 | |
description abstract | Aiming at characterizing interfacial roughness of thin coatings with unknown sound velocity and thickness, we derive a full time-domain ultrasonic reflection coefficient phase spectrum (URCPS) as a function of interfacial roughness based on the phase screen approximation theory. The constructed URCPS is used to determine the velocity, thickness, and interfacial roughness of specimens through the cross-correlation algorithm. The effect of detection frequency on the roughness measurement is investigated through the finite element method. A series of simulations were implemented on Ni-coating specimens with a thickness of 400 μm and interfacial roughness of 1.9–39.8 μm. Simulation results indicated that the measurement errors of interfacial roughness were less than 10% when the roughness satisfies the relationship of Rq = 1.6–10.0%λ. The measured velocity and thicknesses were in good agreement with those imported in simulation models with less than 9.3% error. Ultrasonic experiments were carried out on two Ni-coating specimens through a flat transducer with an optimized frequency of 15 MHz. Compared with the velocities measured by time-of-flight (TOF) method, the relative errors of inversed velocities were all less than 10%. The inversed thicknesses were in good agreement with those observed by optical microscopy with less than 10.9% and 7.6% error. The averaged interfacial roughness determined by the ultrasonic inversion method was 16.9 μm and 30.7 μm, respectively. The relative errors were 5.1% and 2.0% between ultrasonic and confocal laser scanning microscope (CLSM) method, respectively. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Identification of the Velocity, Thickness, and Interfacial Roughness of Coating Using Full Time-Domain URCPS: Cross-Correlation-Based Inverse Problem | |
type | Journal Paper | |
journal volume | 2 | |
journal issue | 1 | |
journal title | Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems | |
identifier doi | 10.1115/1.4042177 | |
journal fristpage | 11008 | |
journal lastpage | 011008-10 | |
tree | Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems:;2019:;volume ( 002 ):;issue: 001 | |
contenttype | Fulltext | |