Relationship between the Frequency Distribution Characteristics of Acoustic Emission and Fracture Mechanisms on AFRP.

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  • ＡＦＲＰの破壊音の周波数分布特性と破壊機構の関連性
  • AFRP ノ ハカイオン ノ シュウハスウ ブンプ トクセイ ト ハカイ キコ

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Abstract

Studies by using an acoustic emission (AE) method have been undertaken to elucidate the fracture mechanisms of AFRP in the static tensile test. The materials used were a unidirectional [0]8 aramid fiber and a quasi-isotropic elastic [0/±45/90]s aramid fiber reinforced plastic in which fiber volume fraction (Vf) was 55%. In this paper, the frequency of the detected AE waves has been studied. On tensile loading, it was recognized that the fracture mechanisms of AFRP were characterized by some microfracture phenomena such as delamination, fiber debonding (debonding at the interfaces between fibers and resin), matrix cracking and fiber breaking. In a unidirectional material, much fiber debonding has been found. On the other hand, much delamination has been seen in a quasi-isotropic elastic material. To generate the fracture mode which causes these phenomena, six-specimens were tested and AE waves were detected. Using the results of the frequency analysis, it was found that the frequency distributions of AE waves corresponding to matrix cracking, delamination, fiber debonding and fiber breaking are 20-50, 50-135, 135-180, and over 180 kHz, respectively. It was confirmed that the fracture phenomena were related to characteristics of the frequency distribution.

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