Materials degradation and altering influence on ultrasonic scattering by the light statistical approach in austenitic thermal loaded materials

Jorma Pitkänen, Pentti Kauppinen, Harri Jeskanen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Materials degradation is a complicated process including multiple phenomena. Degradation is most critical in the near surface areas. These areas contain many types of defects and material phase changes, which are also caused by the degradation of the material. The information received from those material properties are measured with special ultrasonic probe optimised for surface measurement and with a 0° longitudinal wave probe. With help of combining measured data from large area and calculating depths of interest in the sound path (RF‐signal) information can be gained to improve potential estimation of degradation levels. The technique is based on combination of three factors: using back scattered ultrasonic signals and induced leaky Rayleigh wave information (1), and simple statistical data analysis (2) in combination with optimised ultrasonic transducer (3). The back scattered ultrasonic signal is a measure of the amount of geometrical reflectors such as micro‐pores, inclusions, precipitations, segregations, micro‐cracks and cracks as well as of back‐scattering from phase boundaries during fatigue damaging and increase of degradation inside the material. The leaky Rayleigh wave component is sensitive to surface properties as known from normal Rayleigh wave probes. Especially cracks cause strong effect on leaky Rayleigh wave. If the crack is deep it cancels the leaky Rayleigh wave signal totally.
Original languageEnglish
Title of host publicationQuantitative Nondestructive Evaluation
Place of PublicationMelville, New York
PublisherAmerican Institute of Physics AIP
Pages1363-1367
ISBN (Print)0-7354-0173-X
DOIs
Publication statusPublished - 2004
MoE publication typeNot Eligible
EventReview of Progress in Quantitative Nondestructive Evaluation Conference, QNDE - Green Bay, United States
Duration: 27 Jul 20031 Aug 2003

Publication series

NameAIP Conference Proceedings
PublisherAIP
Volume700
ISSN (Print)1224-1231

Conference

ConferenceReview of Progress in Quantitative Nondestructive Evaluation Conference, QNDE
CountryUnited States
CityGreen Bay
Period27/07/031/08/03

Fingerprint

Rayleigh waves
ultrasonics
degradation
scattering
cracks
probes
phase change materials
microcracks
longitudinal waves
surface properties
reflectors
backscattering
transducers
inclusions
acoustics
causes
defects

Cite this

Pitkänen, J., Kauppinen, P., & Jeskanen, H. (2004). Materials degradation and altering influence on ultrasonic scattering by the light statistical approach in austenitic thermal loaded materials. In Quantitative Nondestructive Evaluation (pp. 1363-1367). Melville, New York: American Institute of Physics AIP. AIP Conference Proceedings, Vol.. 700 https://doi.org/10.1063/1.1711774
Pitkänen, Jorma ; Kauppinen, Pentti ; Jeskanen, Harri. / Materials degradation and altering influence on ultrasonic scattering by the light statistical approach in austenitic thermal loaded materials. Quantitative Nondestructive Evaluation. Melville, New York : American Institute of Physics AIP, 2004. pp. 1363-1367 (AIP Conference Proceedings, Vol. 700).
@inproceedings{5a7a88c5c4484044a0bbfbc1eee66e00,
title = "Materials degradation and altering influence on ultrasonic scattering by the light statistical approach in austenitic thermal loaded materials",
abstract = "Materials degradation is a complicated process including multiple phenomena. Degradation is most critical in the near surface areas. These areas contain many types of defects and material phase changes, which are also caused by the degradation of the material. The information received from those material properties are measured with special ultrasonic probe optimised for surface measurement and with a 0° longitudinal wave probe. With help of combining measured data from large area and calculating depths of interest in the sound path (RF‐signal) information can be gained to improve potential estimation of degradation levels. The technique is based on combination of three factors: using back scattered ultrasonic signals and induced leaky Rayleigh wave information (1), and simple statistical data analysis (2) in combination with optimised ultrasonic transducer (3). The back scattered ultrasonic signal is a measure of the amount of geometrical reflectors such as micro‐pores, inclusions, precipitations, segregations, micro‐cracks and cracks as well as of back‐scattering from phase boundaries during fatigue damaging and increase of degradation inside the material. The leaky Rayleigh wave component is sensitive to surface properties as known from normal Rayleigh wave probes. Especially cracks cause strong effect on leaky Rayleigh wave. If the crack is deep it cancels the leaky Rayleigh wave signal totally.",
author = "Jorma Pitk{\"a}nen and Pentti Kauppinen and Harri Jeskanen",
year = "2004",
doi = "10.1063/1.1711774",
language = "English",
isbn = "0-7354-0173-X",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics AIP",
pages = "1363--1367",
booktitle = "Quantitative Nondestructive Evaluation",
address = "United States",

}

Pitkänen, J, Kauppinen, P & Jeskanen, H 2004, Materials degradation and altering influence on ultrasonic scattering by the light statistical approach in austenitic thermal loaded materials. in Quantitative Nondestructive Evaluation. American Institute of Physics AIP, Melville, New York, AIP Conference Proceedings, vol. 700, pp. 1363-1367, Review of Progress in Quantitative Nondestructive Evaluation Conference, QNDE, Green Bay, United States, 27/07/03. https://doi.org/10.1063/1.1711774

Materials degradation and altering influence on ultrasonic scattering by the light statistical approach in austenitic thermal loaded materials. / Pitkänen, Jorma; Kauppinen, Pentti; Jeskanen, Harri.

Quantitative Nondestructive Evaluation. Melville, New York : American Institute of Physics AIP, 2004. p. 1363-1367 (AIP Conference Proceedings, Vol. 700).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - Materials degradation and altering influence on ultrasonic scattering by the light statistical approach in austenitic thermal loaded materials

AU - Pitkänen, Jorma

AU - Kauppinen, Pentti

AU - Jeskanen, Harri

PY - 2004

Y1 - 2004

N2 - Materials degradation is a complicated process including multiple phenomena. Degradation is most critical in the near surface areas. These areas contain many types of defects and material phase changes, which are also caused by the degradation of the material. The information received from those material properties are measured with special ultrasonic probe optimised for surface measurement and with a 0° longitudinal wave probe. With help of combining measured data from large area and calculating depths of interest in the sound path (RF‐signal) information can be gained to improve potential estimation of degradation levels. The technique is based on combination of three factors: using back scattered ultrasonic signals and induced leaky Rayleigh wave information (1), and simple statistical data analysis (2) in combination with optimised ultrasonic transducer (3). The back scattered ultrasonic signal is a measure of the amount of geometrical reflectors such as micro‐pores, inclusions, precipitations, segregations, micro‐cracks and cracks as well as of back‐scattering from phase boundaries during fatigue damaging and increase of degradation inside the material. The leaky Rayleigh wave component is sensitive to surface properties as known from normal Rayleigh wave probes. Especially cracks cause strong effect on leaky Rayleigh wave. If the crack is deep it cancels the leaky Rayleigh wave signal totally.

AB - Materials degradation is a complicated process including multiple phenomena. Degradation is most critical in the near surface areas. These areas contain many types of defects and material phase changes, which are also caused by the degradation of the material. The information received from those material properties are measured with special ultrasonic probe optimised for surface measurement and with a 0° longitudinal wave probe. With help of combining measured data from large area and calculating depths of interest in the sound path (RF‐signal) information can be gained to improve potential estimation of degradation levels. The technique is based on combination of three factors: using back scattered ultrasonic signals and induced leaky Rayleigh wave information (1), and simple statistical data analysis (2) in combination with optimised ultrasonic transducer (3). The back scattered ultrasonic signal is a measure of the amount of geometrical reflectors such as micro‐pores, inclusions, precipitations, segregations, micro‐cracks and cracks as well as of back‐scattering from phase boundaries during fatigue damaging and increase of degradation inside the material. The leaky Rayleigh wave component is sensitive to surface properties as known from normal Rayleigh wave probes. Especially cracks cause strong effect on leaky Rayleigh wave. If the crack is deep it cancels the leaky Rayleigh wave signal totally.

U2 - 10.1063/1.1711774

DO - 10.1063/1.1711774

M3 - Conference article in proceedings

SN - 0-7354-0173-X

T3 - AIP Conference Proceedings

SP - 1363

EP - 1367

BT - Quantitative Nondestructive Evaluation

PB - American Institute of Physics AIP

CY - Melville, New York

ER -

Pitkänen J, Kauppinen P, Jeskanen H. Materials degradation and altering influence on ultrasonic scattering by the light statistical approach in austenitic thermal loaded materials. In Quantitative Nondestructive Evaluation. Melville, New York: American Institute of Physics AIP. 2004. p. 1363-1367. (AIP Conference Proceedings, Vol. 700). https://doi.org/10.1063/1.1711774