Effect of the Surface Force on Subcritical Crack Growth in Glass.

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  • TAKEDA Shin-ichi
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • TARI Isao
    Department of Applied Chemistry, Faculty of Engineering, Okayama University

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  • ガラスにおけるゆるやかなクラック成長に及ばず表面力の影響
  • ガラス ニ オケル ユルヤカナ クラック セイチョウ ニ オヨボス ヒョウメンリョク ノ エイキョウ

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Abstract

The effect of the surface force on subcritical crack growth in glass was investigated in various aqueous solutions. Microcracks were induced on the glass surface by indentation method, which enabled to determine the fatigue limit, Kscc, with good precision. Kscc values obtained in solutions containing K+ or Na+ ions showed that a different factor other than the surface force dominates the crack growth. For solutions containing Li+ or Cs+ ions, a trend opposite to that predicted by the surface force theory was observed, which also suggests that the surface force does not affect the crack growth. For solutions containing n-alkyl-trimethyl-ammonium ions the effect of the surface force on subcritical crack growth was almost negligible, namely in the range 0.010-0.027MPa·m1/2 in the region of an applied stress intensity factor >0.25MPa·m1/2.

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