复合材料梁结构的成型及弯曲特性

Formation of a Composite Beam and Its Flexual Properties

三维立体编织是复合材料增强结构成型的一项十分有效的方法。本文介绍了一种新的编织技术,即利用角轮和拨叉装置控制载纱锭,使其在平面内以设定的路径和方式运动,达到立体编织的目的。由该技术编织工字形截面的纺织结构预制件,经树脂的注入和固化,使之成为梁状复合材料试样。弯曲测试结果表明:工字梁的断裂失效部位为压缩面;纤维体积含量和纤维取向角对梁的弯曲强度和弯曲模量有着不同的影响。

3-D braiding is an effective method for reinforcement forming of composites production. In this report a new braiding technique, is introduced. By means of computer controlled horn gears and switches, the carriers can move-ing in a plane with a required route and manner to generate a 3-D preform. Some I beam performs are braided by this technique. The performs are then converted into composite beams by impregrating with a epoxy-resin and con-solidated to form Specimens. The flexual tests show that the initial failure of I beam specimens happens always in the outer surface of,the compressive flange, and the fibre volume fraction and the fibre orientation have different contributions to the flexual strength and flexual modulus of the specimens.