Measurement of crack opening displacements of branch cracks on both surfaces of plate specimens at bifurcation of fast propagating cracks

Shinichi Suzuki, Kenichi Sakaue

Research output: Contribution to journalArticle

Abstract

Pulsed holographic microscopy is applied to take photographs of a rapidly bifurcating crack in a PMMA plate specimen. The crack is the opening mode and propagates at a speed more than 600 m/s. Two photographs are simultaneously taken on the both sides of the specimen about 15 μs after bifurcation. Crack opening dislacements, CODs, of branch cracks are measured from the photographs on both specimen surfaces. It is found that one of the two branch cracks appears as a surface crack, Also found is that the two branch cracks propagate at the same speed even though one of the two branch cracks is not linked to the mother crack on one side of the specimen. And the CODs of the branch crack that didn't perfectly connect with the mother crack become smaller near the bifurcation point. This fact indicates clearly that the rapid crack bifurcation is three dimensional phenomenon.

Original languageEnglish
Pages (from-to)1312-1318
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume70
Issue number9
Publication statusPublished - 2004 Sep
Externally publishedYes

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Cracks
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Microscopic examination

Keywords

  • Brittle Fracture
  • Crack Bifurcation
  • Crack Opening Displacement
  • Crack Propagation
  • Experimental Stress Analysis
  • Fracture Mechanics
  • High-Polymer Materials
  • Impact Strength

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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title = "Measurement of crack opening displacements of branch cracks on both surfaces of plate specimens at bifurcation of fast propagating cracks",
abstract = "Pulsed holographic microscopy is applied to take photographs of a rapidly bifurcating crack in a PMMA plate specimen. The crack is the opening mode and propagates at a speed more than 600 m/s. Two photographs are simultaneously taken on the both sides of the specimen about 15 μs after bifurcation. Crack opening dislacements, CODs, of branch cracks are measured from the photographs on both specimen surfaces. It is found that one of the two branch cracks appears as a surface crack, Also found is that the two branch cracks propagate at the same speed even though one of the two branch cracks is not linked to the mother crack on one side of the specimen. And the CODs of the branch crack that didn't perfectly connect with the mother crack become smaller near the bifurcation point. This fact indicates clearly that the rapid crack bifurcation is three dimensional phenomenon.",
keywords = "Brittle Fracture, Crack Bifurcation, Crack Opening Displacement, Crack Propagation, Experimental Stress Analysis, Fracture Mechanics, High-Polymer Materials, Impact Strength",
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AU - Suzuki, Shinichi

AU - Sakaue, Kenichi

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N2 - Pulsed holographic microscopy is applied to take photographs of a rapidly bifurcating crack in a PMMA plate specimen. The crack is the opening mode and propagates at a speed more than 600 m/s. Two photographs are simultaneously taken on the both sides of the specimen about 15 μs after bifurcation. Crack opening dislacements, CODs, of branch cracks are measured from the photographs on both specimen surfaces. It is found that one of the two branch cracks appears as a surface crack, Also found is that the two branch cracks propagate at the same speed even though one of the two branch cracks is not linked to the mother crack on one side of the specimen. And the CODs of the branch crack that didn't perfectly connect with the mother crack become smaller near the bifurcation point. This fact indicates clearly that the rapid crack bifurcation is three dimensional phenomenon.

AB - Pulsed holographic microscopy is applied to take photographs of a rapidly bifurcating crack in a PMMA plate specimen. The crack is the opening mode and propagates at a speed more than 600 m/s. Two photographs are simultaneously taken on the both sides of the specimen about 15 μs after bifurcation. Crack opening dislacements, CODs, of branch cracks are measured from the photographs on both specimen surfaces. It is found that one of the two branch cracks appears as a surface crack, Also found is that the two branch cracks propagate at the same speed even though one of the two branch cracks is not linked to the mother crack on one side of the specimen. And the CODs of the branch crack that didn't perfectly connect with the mother crack become smaller near the bifurcation point. This fact indicates clearly that the rapid crack bifurcation is three dimensional phenomenon.

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KW - Impact Strength

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