Automatic restraint and visual detection of fatigue crack growth by applying an alumina paste

Ichihiko Takahashi, Michio Ushijima, Chiori Takahashi, Susumu Uematsu, Noriyuki Kotani

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A paste comprising fine alumina particles was applied on surfaces of steel plate specimens and welded joint specimens, and the effects of the paste on restraint and visual detection of fatigue crack growth were experimentally investigated by performing fatigue tests with in situ observations by a CCD microscope and through various kinds of fractographic observations and elemental analyses using a SEM (Scanning Electron Microscope) and an EPMA (Electron Probe Microanalyser). As a result, the crack growth rate in the plate specimen was drastically retarded by the wedge effect of the alumina particles, and 344% increase in failure life was produced. Similar crack growth restraint effects were also observed on the welded joint specimens, producing 117-175% increase in failure life. In the fatigue tests of the specimens on which the alumina paste was applied, remarkable black color developed in the white alumina paste along the paths of crack propagation, exceedingly facilitating the visual detection of the cracks. An analysis using an X-ray diffractometer showed that the black matter in the paste consists of fine debris derived from the base metal and the alumina particles.

Original languageEnglish
Pages (from-to)531-541
Number of pages11
JournalYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
Volume22
Issue number4
DOIs
Publication statusPublished - 2004 Jan 1
Externally publishedYes

Fingerprint

Aluminum Oxide
Ointments
Fatigue crack propagation
Alumina
Crack propagation
Welds
Fatigue of materials
Steel
Diffractometers
Charge coupled devices
Debris
Microscopes
Electron microscopes
Metals
Color
Cracks
Scanning
X rays
Electrons

Keywords

  • Alumina paste
  • COD
  • Fatigue crack growth
  • Fractographic analysis
  • Retardation
  • Stress intensity factor
  • Visual detection
  • Wedge effect
  • Welded joint

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys

Cite this

Automatic restraint and visual detection of fatigue crack growth by applying an alumina paste. / Takahashi, Ichihiko; Ushijima, Michio; Takahashi, Chiori; Uematsu, Susumu; Kotani, Noriyuki.

In: Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society, Vol. 22, No. 4, 01.01.2004, p. 531-541.

Research output: Contribution to journalArticle

Takahashi, Ichihiko ; Ushijima, Michio ; Takahashi, Chiori ; Uematsu, Susumu ; Kotani, Noriyuki. / Automatic restraint and visual detection of fatigue crack growth by applying an alumina paste. In: Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society. 2004 ; Vol. 22, No. 4. pp. 531-541.
@article{e3e5f41e90cd429db07e37c8c4be572b,
title = "Automatic restraint and visual detection of fatigue crack growth by applying an alumina paste",
abstract = "A paste comprising fine alumina particles was applied on surfaces of steel plate specimens and welded joint specimens, and the effects of the paste on restraint and visual detection of fatigue crack growth were experimentally investigated by performing fatigue tests with in situ observations by a CCD microscope and through various kinds of fractographic observations and elemental analyses using a SEM (Scanning Electron Microscope) and an EPMA (Electron Probe Microanalyser). As a result, the crack growth rate in the plate specimen was drastically retarded by the wedge effect of the alumina particles, and 344{\%} increase in failure life was produced. Similar crack growth restraint effects were also observed on the welded joint specimens, producing 117-175{\%} increase in failure life. In the fatigue tests of the specimens on which the alumina paste was applied, remarkable black color developed in the white alumina paste along the paths of crack propagation, exceedingly facilitating the visual detection of the cracks. An analysis using an X-ray diffractometer showed that the black matter in the paste consists of fine debris derived from the base metal and the alumina particles.",
keywords = "Alumina paste, COD, Fatigue crack growth, Fractographic analysis, Retardation, Stress intensity factor, Visual detection, Wedge effect, Welded joint",
author = "Ichihiko Takahashi and Michio Ushijima and Chiori Takahashi and Susumu Uematsu and Noriyuki Kotani",
year = "2004",
month = "1",
day = "1",
doi = "10.2207/qjjws.22.531",
language = "English",
volume = "22",
pages = "531--541",
journal = "Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society",
issn = "0288-4771",
publisher = "Japan Welding Society",
number = "4",

}

TY - JOUR

T1 - Automatic restraint and visual detection of fatigue crack growth by applying an alumina paste

AU - Takahashi, Ichihiko

AU - Ushijima, Michio

AU - Takahashi, Chiori

AU - Uematsu, Susumu

AU - Kotani, Noriyuki

PY - 2004/1/1

Y1 - 2004/1/1

N2 - A paste comprising fine alumina particles was applied on surfaces of steel plate specimens and welded joint specimens, and the effects of the paste on restraint and visual detection of fatigue crack growth were experimentally investigated by performing fatigue tests with in situ observations by a CCD microscope and through various kinds of fractographic observations and elemental analyses using a SEM (Scanning Electron Microscope) and an EPMA (Electron Probe Microanalyser). As a result, the crack growth rate in the plate specimen was drastically retarded by the wedge effect of the alumina particles, and 344% increase in failure life was produced. Similar crack growth restraint effects were also observed on the welded joint specimens, producing 117-175% increase in failure life. In the fatigue tests of the specimens on which the alumina paste was applied, remarkable black color developed in the white alumina paste along the paths of crack propagation, exceedingly facilitating the visual detection of the cracks. An analysis using an X-ray diffractometer showed that the black matter in the paste consists of fine debris derived from the base metal and the alumina particles.

AB - A paste comprising fine alumina particles was applied on surfaces of steel plate specimens and welded joint specimens, and the effects of the paste on restraint and visual detection of fatigue crack growth were experimentally investigated by performing fatigue tests with in situ observations by a CCD microscope and through various kinds of fractographic observations and elemental analyses using a SEM (Scanning Electron Microscope) and an EPMA (Electron Probe Microanalyser). As a result, the crack growth rate in the plate specimen was drastically retarded by the wedge effect of the alumina particles, and 344% increase in failure life was produced. Similar crack growth restraint effects were also observed on the welded joint specimens, producing 117-175% increase in failure life. In the fatigue tests of the specimens on which the alumina paste was applied, remarkable black color developed in the white alumina paste along the paths of crack propagation, exceedingly facilitating the visual detection of the cracks. An analysis using an X-ray diffractometer showed that the black matter in the paste consists of fine debris derived from the base metal and the alumina particles.

KW - Alumina paste

KW - COD

KW - Fatigue crack growth

KW - Fractographic analysis

KW - Retardation

KW - Stress intensity factor

KW - Visual detection

KW - Wedge effect

KW - Welded joint

UR - http://www.scopus.com/inward/record.url?scp=12744277408&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=12744277408&partnerID=8YFLogxK

U2 - 10.2207/qjjws.22.531

DO - 10.2207/qjjws.22.531

M3 - Article

VL - 22

SP - 531

EP - 541

JO - Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society

JF - Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society

SN - 0288-4771

IS - 4

ER -