| 摘要 |
<p>A quasi-isotropic three-dimensional woven preform (100) includes individual fabric strips or woven elements (10), which are then braided together to form a quasi-isotropic three-dimensional woven structure with an array of integrally woven off-axis stiffeners. The woven element (10) may be a fabric strip that has been constructed with integral transverse stiffeners (16) placed periodically along its length. The woven element (10) may include three sections of skin and three transverse stiffeners. There can be any number of skin and stiffener sections. More sections allow to make larger panels (i.e. more hexagonal cells). These woven elements may be braided in a pattern that orients the longitudinal axis of the woven elements (10) in the 0°, +60°, and -60° directions. The transverse stiffeners (16) are folded flat against the skin while the woven elements (10) are being braided, and are then folded up into position after the woven element (10) is braided into place. A fiber reinforced composite may comprise such a quasi-isotropic three dimensional woven preform (100).</p> |
