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Main Advantages: i) High fibre volumes can be accurately achieved with low void contents for very thick laminates (100mm). ii) High resin mechanical properties due to solid state of initial polymer material and elevated temperature cure. iii) Enables the use of lower cost heavyweight materials (eg 1600 gsm) and allows fast deposition rates reducing component manufacturing costs. iv) Very robust and repeatable process as the resin content is accurately controlled and the complexity of the infusion process is very low. Main Disadvantages: i) Materials cost is still higher than for non-peimpregnated fabrics although resin costs are lower than those required for aerospace applications. ii) Tooling needs to be able to withstand higher temperatures than Infusion Processes (typically 80-140°C). Typical Applications: High-performance wind-turbine blades, large racing and cruising yachts, rescue craft. 7. Secondary bonding Since composite materials are often used in weight critical applications, it follows that methods of joining and fastening components should not add unnecessary weight to a structure. For this reason bonding, or joining with adhesives, of composite parts is common. Other reasons for selecting adhesive bonding over mechanical fastening or other joining methods include: ■ Cosmetic - design aesthetics ■ Technical - joint performance, assembly complexity ■ Economic - cost of assembly, reduced part count 7.1 Science of adhesion The fundamental concepts of adhesion are complex and there are 4 main mechanisms identified: ■ Mechanical Interlocking ■ Diffusion theory ■ Electronic theory ■ Adsorption theory A fifth concept, weak boundary layers (WBL) has been proposed which is a mechanism which may impede the formation of a good bond. GTC-6-0417 - 57PDF Image | GUIDE TO COMPOSITES
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