Reduction in K1 by Shape Memory Effect in a TiNi Shape-Memory fiber-Reinforced Epoxy Matrix Composite.

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  • 形状記憶ＴｉＮｉ埋め込みファイバの収縮効果を利用した複合材料のき裂閉鎖作用
  • ケイジョウ キオク TiNi ウメコミ ファイバ ノ シュウシュク コウカ オ

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Abstract

As TiNi shape-memory fiber-reinforced epoxy matrix composite with given prestrain εr in TiNi fiber at room temperature is subjected to temperature increase so as to exceed austenitic finish temperature (Af), the TiNi fiber shrinks to its original length by εr resulting in compressive stress in the epoxy matrix. This compressive stress in the matrix was utilized to reduce K1 of a sidenotched TiNi/epoxy composite, which was confirmed by the present experiment with two types of temperature control : Joule heating by passing an electric current through TiNi fibers and subjecting the composite to a constant temperature using an iso temperature furnace. An analytical model baged on Eshelby's model is developed in order to compute the averaged matrix compressive stress which is then coupled with Tada's formula for computing ΔK1. The experimental trend that |ΔK1|increases with prestrain εr was in good agreement with the predictions based on the present model.

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