TAILIEUCHUNG - 3D Fibre Reinforced Polymer Composites Part 3

Tham khảo tài liệu '3d fibre reinforced polymer composites part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 26 3D Fibre Reinforced Polymer Composites are four separate sequences of row and column motion shown in Figure which act to interlock the yarns and produce the braided preform. The yarns are mechanically forced into the structure between each step to consolidate the structure in a similar process to the use of a reed in weaving. The motion of the rows columns and take-up can be altered to obtain preforms with different braid patterns and thus control the mechanical properties of the preform in the three principal directions. b Figure a Production of standard braided tubular fabric b Schematic of typical braid architecture Moving mandrel Figure a Schematic of braiding over a moving mandrel b Example of braiding over a T-shaped mandrel courtesy of the Cooperative Research Centre for Advanced Composite Structures Ltd The process of 4-step braiding can also be accomplished with a cylindrical equipment configuration. An example of this braiding process called Through-the-Thickness braiding was developed at Atlantic Research Corporation Brown 1985 1988 . The equipment consists of a number of identical rings situated side by side in an axial arrangement. These rings contain grooves within which the yarn carriers can move from ring to ring in an axial direction. Movement circumferentially is achieved through rotation of the rings thus accomplishing the 4-step process as shown in Figure . Manufacture of 3D Fibre Preforms Braider Yarn carriers a 28 3D Fibre Reinforced Polymer Composites This type of cylindrical arrangement has the advantage that it is more efficient with space than the flat-bed arrangement. Both equipment configurations can be easily expanded through the addition of extra rings or flat tiles respectively Thaxton et al 1991 . Figure Schematic of the 4-Step braiding process Figure Through-the-Thickness equipment developed at Atlantic Research Corporation courtesy of Atlantic Research Corporation

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