リサイクル・PEEK樹脂の優れた疲労き裂進展特性の機構解析

概要

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The influences of recycling process on fatigue crack propagation property have been studied for PEEK (poly-ether-ether-keton) resin materials and PA 66 (poly-amid 66) resin materials, and also the fracture mechanisms have been analyzed for their reliability. Main results were as follows : (1) The resistance against the crack propagation of recycled PEEK materials were equal to that of virgin material. On the other hand, the resistance of recycled PA 66 materials were lower than that of virgin material. (2) Examination of the fracture surface by scanning electron microscopy (SEM) revealed that the pattern of fracture surface of recycled PEEK materials were equal to that of virgin material, but that of recycled PA 66 materials were not equal to it. It revealed the existence of parabola pattern on the fracture surface. This parabola pattern was increased in its number and became small with increasing of the recycling number. (3) Examination by SEM revealed the existence of a void that diameter was about 3〜5μm in a parabola pattern. The starting point of these cracks were these voids and cracks initiated from these voids. (4) Recycled PA 66 materials were became brittle by recycling process. This is because that molecular weight of PA 66 material was decreased with increasing of recycling process number, besides, the moisture absorption rate of PA 66 material was increased during recycling process.
一般社団法人日本機械学会の論文
1999-09-25