Measurement of crack opening displacement and energy release rate of rapidly bifurcating cracks in PMMA by high-speed holographic microscopy

Shinichi Suzuki, Kenichi Sakaue

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

High-speed holographic microscopy is applied to take three successive photographs of fast propagating cracks at the moment of bifurcation. The cracks are propagated in PMMA plate specimens at a speed about 660 m/s. From the photographs, crack opening displacement (COD) is measured along the cracks as a function of distance r from the crack tips. The measurement results show that the CODs are proportional to √r before bifurcation. After bifurcation, the CODs of mother cracks are proportional to √r, however, the CODs of branch cracks are not always proportional to √r. Crack speed is also measured from the photographs. As a result, discontinuous change of crack speed is not observed at the moment of bifurcation. The energy release rate and energy flux toward crack tips are obtained from the COD data, and are found to be continuous across the bifurcation point. The energy release rate and energy flux increase gradually across the bifurcation point.

Original languageEnglish
Pages (from-to)264-273
Number of pages10
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Volume47
Issue number3
DOIs
Publication statusPublished - 2004 Jul
Externally publishedYes

Fingerprint

Energy release rate
Polymethyl Methacrylate
Microscopic examination
Cracks
Crack tips
Fluxes

Keywords

  • Brittle fracture
  • Crack bifurcation
  • Crack opening displacement
  • Energy Release rate
  • Fracture mechanics
  • Holography
  • Microscopy
  • Optical measurement
  • Speed photography

ASJC Scopus subject areas

  • Mechanical Engineering
  • Materials Science(all)

Cite this

@article{eb824e41f163462da174a7f3b9eb7f34,
title = "Measurement of crack opening displacement and energy release rate of rapidly bifurcating cracks in PMMA by high-speed holographic microscopy",
abstract = "High-speed holographic microscopy is applied to take three successive photographs of fast propagating cracks at the moment of bifurcation. The cracks are propagated in PMMA plate specimens at a speed about 660 m/s. From the photographs, crack opening displacement (COD) is measured along the cracks as a function of distance r from the crack tips. The measurement results show that the CODs are proportional to √r before bifurcation. After bifurcation, the CODs of mother cracks are proportional to √r, however, the CODs of branch cracks are not always proportional to √r. Crack speed is also measured from the photographs. As a result, discontinuous change of crack speed is not observed at the moment of bifurcation. The energy release rate and energy flux toward crack tips are obtained from the COD data, and are found to be continuous across the bifurcation point. The energy release rate and energy flux increase gradually across the bifurcation point.",
keywords = "Brittle fracture, Crack bifurcation, Crack opening displacement, Energy Release rate, Fracture mechanics, Holography, Microscopy, Optical measurement, Speed photography",
author = "Shinichi Suzuki and Kenichi Sakaue",
year = "2004",
month = "7",
doi = "10.1299/jsmea.47.264",
language = "English",
volume = "47",
pages = "264--273",
journal = "JSME International Journal, Series A: Solid Mechanics and Material Engineering",
issn = "1344-7912",
publisher = "Japan Society of Mechanical Engineers",
number = "3",

}

TY - JOUR

T1 - Measurement of crack opening displacement and energy release rate of rapidly bifurcating cracks in PMMA by high-speed holographic microscopy

AU - Suzuki, Shinichi

AU - Sakaue, Kenichi

PY - 2004/7

Y1 - 2004/7

N2 - High-speed holographic microscopy is applied to take three successive photographs of fast propagating cracks at the moment of bifurcation. The cracks are propagated in PMMA plate specimens at a speed about 660 m/s. From the photographs, crack opening displacement (COD) is measured along the cracks as a function of distance r from the crack tips. The measurement results show that the CODs are proportional to √r before bifurcation. After bifurcation, the CODs of mother cracks are proportional to √r, however, the CODs of branch cracks are not always proportional to √r. Crack speed is also measured from the photographs. As a result, discontinuous change of crack speed is not observed at the moment of bifurcation. The energy release rate and energy flux toward crack tips are obtained from the COD data, and are found to be continuous across the bifurcation point. The energy release rate and energy flux increase gradually across the bifurcation point.

AB - High-speed holographic microscopy is applied to take three successive photographs of fast propagating cracks at the moment of bifurcation. The cracks are propagated in PMMA plate specimens at a speed about 660 m/s. From the photographs, crack opening displacement (COD) is measured along the cracks as a function of distance r from the crack tips. The measurement results show that the CODs are proportional to √r before bifurcation. After bifurcation, the CODs of mother cracks are proportional to √r, however, the CODs of branch cracks are not always proportional to √r. Crack speed is also measured from the photographs. As a result, discontinuous change of crack speed is not observed at the moment of bifurcation. The energy release rate and energy flux toward crack tips are obtained from the COD data, and are found to be continuous across the bifurcation point. The energy release rate and energy flux increase gradually across the bifurcation point.

KW - Brittle fracture

KW - Crack bifurcation

KW - Crack opening displacement

KW - Energy Release rate

KW - Fracture mechanics

KW - Holography

KW - Microscopy

KW - Optical measurement

KW - Speed photography

UR - http://www.scopus.com/inward/record.url?scp=4744370333&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4744370333&partnerID=8YFLogxK

U2 - 10.1299/jsmea.47.264

DO - 10.1299/jsmea.47.264

M3 - Article

AN - SCOPUS:4744370333

VL - 47

SP - 264

EP - 273

JO - JSME International Journal, Series A: Solid Mechanics and Material Engineering

JF - JSME International Journal, Series A: Solid Mechanics and Material Engineering

SN - 1344-7912

IS - 3

ER -