引張り／ねじり二軸荷重下における平織りＧＦＲＰの疲労特性に及ぼす試験温度の影響

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  • Effect of Temperature on Fatigue Properties of GFRP under Tension/Torsion Biaxial Loading.
  • ヒッパリ ネジリ 2ジク カジュウ カ ニ オケル ヒラオリ GFRP ノ ヒロウ トクセイ ニ オヨボス シケン オンド ノ エイキョウ

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The effect of temperature on fatigue properties of a plain weave glass fabric reinforced plastics(GFRP)under tension/ torsion biaxial loading was studied. Fatigue tests were conducted at several terperatures between -23 and 60°C. The biaxial loads were proportinally applied to specimens. Although the static strength of GFRP at elevated terperature was lower than that at room and low terperatures below 0°C, the fatigue life at 60°C was longest when the specimens were subjected to a tension/torsion biaxial stress combination whose maximum cyclic stress normalized by the static strength at each temperature was constant for all tests.The primary fatigue damage at elevated temperature was meta-delamination occurring at cross-over points between wefts and warps. No meta-delamination was observed in the specimens tested at temperatures below 0°C while matrix cracks propagating across fiber bundles were formed. The modulus decay of GFRP in shear was greatly influenced by internal fatigue damage such as meta-delamination and matrix cracking more than the modulus decay in tension.

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