リサイクル先進強化PEEKの高温疲労き裂進展特性に及ぼす疲労・クリープ相互作用

概要

論文の詳細を見る
The influences of interaction between fatigue and creep have been studied for fiber-reinforced-PEEK (poly-ether-ether-keton) materials at elevated temperature. Especially, the mechanism of complex deterioration by heat, stress and recycling process has been analyzed. Main results were as follows : (1) The resistance of crack propagation of recycled carbon-fiber-reinforced PEEK (CF material) was equal to that of the virgin material, on the other hand, the resistance of recycled glass-fiber-reinforced PEEK was lower than that of the virgin material. (2) Strain at notch tip increased remarkebly with increasing number of cycles in fatigue process at elevated temperature. It was thought that the creep velocity was increased by decreasing of the elasticity modulus of PEEK matrix at the ultimate environmental temperature above glass transition temperature. (3) It was found that the carbon fibers were not broken by recycling process, but the glass fibers were broken by recycling process. So it was understood that the difference of resistance against fatigue crack propagation and creep due to kinds of reinforced fiber can be explained by the difference of fiber bridging effect. (4) It was suggested that the reliability of recycled plastic products would be improved by the control of meso-scopic factor.
一般社団法人日本機械学会の論文
1999-10-25