Fatigue Reliability of Recycled Advanced-Reinforced PAMXD6. 3rd Report. Estimation of Recycled Plastic Reliability with Fatigue Fracture Toughness.

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  • リサイクル先進強化ナイロンＭＸＤ６の疲労信頼性　第３報　疲労破壊靭性値によるリサイクルプラスチックの安全性の評価
  • リサイクル センシン キョウカ ナイロン MXD6 ノ ヒロウ シンライセイ

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The liability of recycled plastic product was estimated using the fatigue fracture toughness. The role of fibers at the crack tip was simulated by FEM using EWS. The main results obtained were as follows. (1)The fatigue fracture toughness KFC of recycled reinforced PA·MXD6 was lower than that of virgin material, whereas KFC of 'Ecomaterial' and virgin material were almost the same. (2)Crack propagation behaviors of recycled material was remarkably different from that of virgin material. In recycled material, fatigue crack propagation perpendicular to the loading direction was turned into unstable crack growth parallel to the loading direction. (3)Crack length of fracture mode transition decreased with increase of recycled frequency. The criterion of unstable fracture could be estimated by clarification of relationship between transition crack length and fatigue fracture toughness. (4)Crack deflection behavior was examined by FEM simulation. Crack deflection in recycled material resulted from inhomogeneous strain distribution in the process zone.

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