Discontinuous long fiber (DLF) materials are increasingly used by aircraft manufacturers to replace complex shaped metal parts. DLF is produced by cutting C/PEEK UD tape with 60 % fiber content into flakes that are then near net molded into parts. The use of this material has often been limited to temperatures below the glass transition temperature (Tg) as the polymer matrix suffers from increased creep above Tg. While it is known that the addition of carbon fibers reduces creep there is no published data available that shows long term behavior at temperatures above Tg. In this presentation we show the results of 1000 hours creep tests at temperatures up to 288 °C. The creep modulus of DLF shows a clear increase over a 30 % short fiber filled injected C/PEEK and a remarkably good long-term stability.
Creep, High Temperature, Discontinuous Fiber