Simultaneous photographing of fast propagating cracks at bifurcation on both surfaces of plate specimens

Shinichi Suzuki, Kenichi Sakaue

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Pulsed holographic microscopy is applied to take photographs of rapidly bifurcating cracks in PMMA plate specimens. The cracks are of the opening mode and propagate at a speed more than 600 m/s. The photographs are simultaneously taken on the both side of the specimens about 10 μs after bifurcation. The photographs show that, in many cases, the bifurcated crack's shape on one side of a specimen is apparently different from that on the other side of the specimen. Even in the case of cracks that have similar shapes on the both sides of specimens, the crack shapes are different near the bifurcation points on the both sides of the specimens. These facts indicate that the rapid crack bifurcation in PMMA is three dimensional phenomenon. Also shown is the example that two crack branches have different crack opening displacements. It means that the bifurcation of the crack was asymmetric with respect to the line along the mother crack.

Original languageEnglish
Pages (from-to)1674-1680
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume68
Issue number11
Publication statusPublished - 2002 Nov
Externally publishedYes

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Cracks
Polymethyl Methacrylate
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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abstract = "Pulsed holographic microscopy is applied to take photographs of rapidly bifurcating cracks in PMMA plate specimens. The cracks are of the opening mode and propagate at a speed more than 600 m/s. The photographs are simultaneously taken on the both side of the specimens about 10 μs after bifurcation. The photographs show that, in many cases, the bifurcated crack's shape on one side of a specimen is apparently different from that on the other side of the specimen. Even in the case of cracks that have similar shapes on the both sides of specimens, the crack shapes are different near the bifurcation points on the both sides of the specimens. These facts indicate that the rapid crack bifurcation in PMMA is three dimensional phenomenon. Also shown is the example that two crack branches have different crack opening displacements. It means that the bifurcation of the crack was asymmetric with respect to the line along the mother crack.",
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