On the behaviour of flattened tubular Bi-axial and Tri-axial braided composites in tension

Influence of the Unit Cell Parameters on the Thermomechanical Non-Symmetric In-Plane Shear Behavior of 2D Biaxial Braided Preform for Thermoplastic Biocomposites

“…The 2D biaxial braided prepregs were manufactured by circular braiding loom with 96 bobbin tows carriers (Herzog GLH 1/97/96-100) at Gemtex laboratory, shown in Figure 6 a. Based on the unit cell geometry, braiding process parameters as production speed and carrier rotational speed were chosen to obtain three different circular braided preforms [ 52 ]: BR-A, BR-B, and BR-C, as shown as Figure 6 b. BR-A and BR-B possess the same braiding angle but a different tow waviness ratio and cover factor; BR-B and BR-C possess the same tow waviness ratio and cover factor but a different braiding angle. The circular braids BR-A and BR-C are wider than BR-B to facilitate comparative study, the unit cell width of BR-A and BR-C is equal by controlling the braiding process parameters.…”

Design optimisation of braided composite beams for lightweight rail structures using machine learning methods

“…While the results of the program from a manufacturing perspective were encouraging, aligned with the conventions of the composites industry, the project considered uniform braid angles of ±45º, i.e., a quasi-isotropic layup, for all the beams in the chassis. Thus, the resulting design was sub-optimal and did not exploit the potential offered by the correlation reported between properties and braid angle in previous studies [3][4][5][6][7][8][9][10][11][12][13][14]. As the structural performance is a combined outcome of material properties (dependent on braid angle) and geometry (dependent on braid angle and number of layers), this study investigates the potential of improving the structural efficiency, i.e., per unit weight mechanical performance, by considering different braid angles and number of layers in different beams across the structure.…”

“…as well as physical properties (thickness, weight etc.) on braid angle [8][9][10][11][12][13][14]. These parameters combine to define the overall structural performance, therefore controlling the braid angle is an excellent avenue for tailoring braided composites without adding any cost or time to the braiding process.…”

The effect of braid angle on the flexural performance of structural braided thermoplastic composite beams

“…Previous work has shown that the braid angle is directly related to the properties of the produced composite. For example, braiding at a higher braid angle leads to an increase in the thickness of the braided tows, therefore increasing the thickness of the braided component [5]. The mechanical properties of braided composites including elastic properties as well as mechanical strength have been shown to depend on braid angle [6][7][8].…”