Gr/PEEK

Figure 14.9 Photograph of a Gr/PEEK laminate in which a bend was introduced and propagated into the workpiece using the near-term demonstration machine with a variable velocity profile. Fiber alignment, surface quality, and macroscopic shape are good...

Figure 14.11 (a) Photograph of a formed Gr/PEEK laminate containing mostly longitudinal plies. 

Figure 14.16 (a) Circular Dual-Dee induction coil used in early work on the continuous dieless forming process, (b) Addition of ferrite flux concentrator to Dual-Dee coil, (c) Temperature patterns generated in a Gr/PEEK laminate by the circular Dual-Dee coil with ferrite flux concentrator. The coil end was located at various distances from the laminate edge. No one position produced a uniform temperature profile... 

Yencho then constructed the initial version of the machine and explored the parameters necessary to successfully form flaw-free parts. A key finding concerned the effects of trapped moisture. Despite the generally hydrophobic nature of PEEK, it was found that small amounts of moisture absorbed by the Gr/PEEK laminates subsequent to their manufacture converted into steam during the forming operation and caused extensive delamination. This was in... 

Pappa P et al (2012) Structural safety of industrial steel tanks, pressure vessels and piping systems under seismic loading (INDUSE). RFCS project final report, Brussels, www.mie.uth.gr/induse Peek R (1988) Analysis of unanchored liquid storage tanks under lateral loads. Earthq Eng Struct Dyn 16 1087-1100... 

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