光ファイバの破壊靱性に及ぼす湿度の影響

概要

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The effect of humidity on the fracture toughness of the optical silica fiber was investigated using real fiber specimens 125μm in diameter. Each fiber specimen with a precrack was tested under constant tensile loads at several temperatures and humidities. The stress intensity factor at the onset of final unstable fracture after stable crack growth, i. e., fracture toughness K_<IC>, was obtained based on the observed crack front on the fractured surface. It was found from this study that the fracture toughness K_<IC> of the optical glass fiber varied as a function of water-vapor pressure P_<H_2O> in the environment for P_<H_2O> of less than about 3kPa and showed a lower value at the higher lever of P_<H_2O>. For example, K_<IC> ≃ 0.9MPa√<m> at P_<H_2O> ≃ 0.5kPa and K_<IC> ≃ 0.7 MPa√<m> at P_<H_2O> ≃ 3kPa.
一般社団法人日本機械学会の論文
1992-02-25