第 1 部 (19) 高速進展き裂先端応力場のホログラフィ計測

概要

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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 of about 660m/s. From the photographs, crack opening displacement (COD) is measured along the cacks as a function of distance γ from the crack tips. The measurement results show that the CODs are proportional to √<γ> before bifurcation. After bifurcation, the CODs of mother cracks are proportional to √<γ>. The energy release rate and the energy flux toward a crack tip are obtained from the COD data, and are found to be continuous across the bifurcation point. Dynamic stress intensity factor, K_I (υ) is also obtained from interference fringes around the crack tips at bifurcation.
一般社団法人日本機械学会の論文
2003-03-27