The effect of physiological salt water on fatigue crack propagation rate for glass fiber reinforced polycarbonate.

MURAKAMI Ri-ichi, NOGUCHI Shinji, AKIZONO Ko-ichi

doi:10.1299/kikaia.54.917

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Other Title

ガラス繊維強化複合材料の疲労き裂伝ぱ速度に及ぼす生理食塩水環境の影響
ガラスセンイキョウカフクゴウザイリョウノヒロウキレツデンパソ

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Abstract

The fatigue crack propagation in physiological salt water was investigated in polycarbonte and glass fiber reinforced polycarbonte. The effects of physiological salt water, glass fiber content and stress ratio on fatigue crack growth rate were determined. These effects in physiological salt water could be considered by dividing the crack growth rate curve into two regions ; I and II. The crack growth rate in region I was accelerated by the physiological salt water and stress ratio. In region II, the crack growth rate increased rapidly with increasing ΔK. This transition behavior may result from the physiological salt water penetrating the fatigue crack, which demeans itself like a viscous fluid against a viscous elastic crack, and divides the crack growth rate curve into two regions. The physiological salt water markedly influenced the fracture morphology at a low ΔK level. The fatigue crack propagation behavior in the physiological salt water resulted from a variation of fracture morphology with increasing ΔK.

Journal

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 54 (501), 917-924, 1988

The Japan Society of Mechanical Engineers

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