INFLUENCE OF ENVIRONMENTAL-TEMPERATURE ON FATIGUE RELIABILITY AT ELEVATED-TEMPERATURE FOR CARBON-FIBER-REINFORCED PEEK (ON THE GROWTH-MECHANISM FROM MESOCRACKS TO MACROCRACKS)

Citation
M. Nakamura et al., INFLUENCE OF ENVIRONMENTAL-TEMPERATURE ON FATIGUE RELIABILITY AT ELEVATED-TEMPERATURE FOR CARBON-FIBER-REINFORCED PEEK (ON THE GROWTH-MECHANISM FROM MESOCRACKS TO MACROCRACKS), JSME international journal. Series A, Solid mechanics and material engineering, 41(1), 1998, pp. 127-133
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Engineering, Mechanical","Material Science
ISSN journal
1344-7912
Volume
41
Issue
1
Year of publication
1998
Pages
127 - 133
Database
ISI
SICI code
1344-7912(1998)41:1<127:IOEOFR>2.0.ZU;2-I
Abstract
In this paper, the influence of environmental temperature on fatigue r eliability for advanced carbon-fiber-reinforced-thermal-plastic PEEK w as examined. Attention was focused on the mechanism of growth from mes ocracks to macrocracks at elevated temperature. The main results were as follows, (1) The fatigue life at elevated temperature was arranged by the fatigue strength of CF15 and gf30 materials decreased with incr easing environmental temperature. Further, the strength of CF15 materi al was superior to that of gf30 material. (2) The influence of stress and environmental temperature was represented by the N-f - 1/T diagram and S - T(C + log t(r)) diagram. Therefore, it was suggested that hig h-cycle fatigue life could be estimated from these parameters. (3) Fro m the results of fractography using SEM, the fracture surface of CF15 material was ductile, on the other hand, that of gf30 material was bri ttle. (4) It was appeared that the temperature rise in the fatigue dam age zone was closely related to the mesocrack formation process. (5) I t was thought that the difference of mesocrack formation between CF15 material and gf30 material was reflected in the difference of the acti vation energy.