Measurement of Crack Opening Displacement and Energy Release Rate of Rapidly Bifurcating Cracks in PMMA by High-Speed Holographic Microscopy(<Special Issue>Advanced Technology of Experimental Mechanics) Measurement of Crack Opening Displacement and Energy Release Rate of Rapidly Bifurcating Cracks in PMMA by High-Speed Holographic Microscopy

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Abstract

・rights:日本機械学会・rights:本文データは学協会の許諾に基づきCiNiiから複製したものである・relation:isVersionOf:http://ci.nii.ac.jp/naid/110004820484/

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 660m/s. From the photographs, crack opening displacement (COD) is measured along the cracks as a function of distance <i>r</i> from the crack tips. The measurement results show that the CODs are proportional to √<i>r</i> before bifurcation. After bifurcation, the CODs of mother cracks are proportional to √<i>r</i>, however, the CODs of branch cracks are not always proportional to √<i>r</i>. 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.

Journal

  • JSME International Journal Series A

    JSME International Journal Series A 47(3), 264-273, 2004-07-01

    The Japan Society of Mechanical Engineers

References:  20

Cited by:  3

Codes

  • NII Article ID (NAID)
    110004820484
  • NII NACSIS-CAT ID (NCID)
    AA11179396
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    13447912
  • NDL Article ID
    7006064
  • NDL Source Classification
    ZN11(科学技術--機械工学・工業)
  • NDL Call No.
    Z53-E315
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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