Author:
PANIN S.V.,BOGDANOV A.A.,ALEKSENKO V.O.,BOCHKAREVA S.A.,LYUBUTIN P.S.,PANOV I.L.,TIAN D.
Abstract
In this work, the relationship was considered between the structure and cyclic loading resistance of a layered composite consisting of PEI (PEEK) plate/PEI (PEEK) film/PEI-impregnated carbon-fiber fabric prepreg/PEI (PEEK) film/PEI (PEEK) plate by analyzing the time variation in the parameters of mechanical hysteresis loops calculated using digital image correlation. It was shown that the polyetherimide-based layered composite has low fatigue life under cyclic loading (0.8 of the yield strength), resulting from incompatible deformation between the PEI plates and the prepreg due to an interlayer interface formed by low-melting TecaPEI film. In the PEEK layered composite, the interlayer interface was formed by pure PEEK energy director and therefore had a little amount of defects, due to which the load was well transferred from the PEEK plates to the middle reinforcement layer. As a result, the fatigue life at a load level of 0.8 of the yield strength corresponded to high-cycle fatigue (more than 86 000 cycles).
Publisher
Institute of Strength Physics and Materials Science SB RAS