高温条件下でのガラスクロス積層材の衝撃疲労強度とその信頼性(<小特集>信頼性工学小特集)

概要

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The impact fatigue tests were perfomed on glass-cloth reinforced epoxy resin laminates at various temperatures up to 200℃. From the experiments, the temperature-dependence of impact fatigue strength was clarified. The scatter of this strength at each temperature was statisically analyzed and its temperature-dependence was also clarified. The safety factor and the allowable stress for the laminates under service impact loads were studied with regard to the influence of circum-temperature used, on the basis of reliability theory. The results obtained are as follows: (The impact fatigue strength σ_t of the laminates shows a scatter of logarithmic distribution at high temperatures and can be estimated statistically by the formula of σ_tN_f^<mt>=D_tμ_tS_t^u. (2) The parameters of impact fatigue property, m_t and D_t, and the strength scatter S_t are dependent upon temperature. Both of m_t and D_t can be estimated from the statistic (σ_B, S_<σB>) of static tensile strength σ_B at room temperature (20 ety factor and the allowable stress of the laminates under service impact loads can be determined according to the expectative reliability with regard to the circum-temperature practically used. This result is very useful for the optimum structural design.
社団法人日本材料学会の論文
1987-09-15