Method for weaving three-dimensional preform having gradient structure

A method for weaving a three-dimensional preform having a gradient structure, comprising the following steps:

• (a) according to service environment, operating mode and loading condition of a required composite material parts, dividing and determining performance requirements of different functional locations of the parts, and determining a transition area;
• (b) according to the performance requirements of the different functional locations of the parts, selecting different varieties and specifications of guide sleeves and fibers, and designing different arrangement manners and arrangement spaces of the guide sleeves, winding manners of fibers and densities of winding layers of the fibers;
• (c) designing varieties, specifications, arrangement manners and arrangement spaces of guide sleeves in the transition area, and designing varieties, specifications and winding manners of fibers as well as densities of winding layers in the transition area, thereby implementing smooth transition of the transition area;
• wherein a smooth transition manner of the transition area in the step (c) comprises:
• wherein the functional locations are made of different fiber materials, the transition area is in gradual transition using multiple fibers according to a proportional change of different fibers;
• wherein volume fractions of the fibers on the functional locations are different, densities of fiber winding layers in the transition area are in a gradual transition;
• wherein arrangement spaces of the guiding sleeves on the functional locations are different, the arrangement spaces of the guiding sleeves in the transition area are in an equidifferent transition;
• wherein guiding sleeves on different functional locations are made of different materials, the guide sleeves in the transition area are in transition with considerations to a gradient layout of the materials of guide sleeves on the functional locations;
• (d) determining a weaving sequence in a computer according to layouts of the guide sleeves, the winding manners of the fibers on the functional locations and in the transition areas, then generate a fiber iterative instruction for layer-by-layer weaving;
• (e) arranging guide sleeves according to design requirements of the functional locations and the transition areas and then generate a guide sleeve array;
• and
• (f) driving a weaving mechanism to select different fibers for subarea weaving layer by layer in the guide sleeve array till the weaving of all fiber layers is finished to obtain the three-dimensional preform having a gradient structure.