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

概要

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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℃. 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℃, the fatigue life at 60℃ 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℃ 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.
社団法人日本機械学会の論文
2000-11-25