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

Shinichi Suzuki, Kenichi Sakaue

研究成果: Article査読

5 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)264-273
ページ数10
ジャーナルJSME International Journal, Series A: Solid Mechanics and Material Engineering
47
3
DOI
出版ステータスPublished - 2004 7
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 機械工学

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