GMT流动成型纤维取向研究

STUDY ON THE FIBER ORIENTATION IN THE FLOW MOLDING OF GMT

GMT材料流动成型后玻纤在平面内发生取向 ,导致模压件呈各向异性。本研究从成型后制品上取样烧尽树脂 ,由扫描仪获取纤维数值图像 ,用 Photoshop软件将图像反相、增强 ,再利用 MATLAB软件确定纤维取向分布。研究表明 ,GMT单向流动成型时纤维沿流动方向取向 ,随流动距离增大 ,取向趋向更为明显。而均匀双向拉伸流动纤维取向程度较小。与片材相比 ,材料力学性能沿取向方向增大 。

The planar orientation of fibers may occur after the flow molding of GMT, which can result in anisotropy molded parts. In this work the specimens cut from the molded GMT plates were burned off the matrix in a oven for 4 h. The fiber images were taken using a scanner and the photoshop software was used to revert and enhance the pictures and get rid of the back grounds to make the fibers more obvious to be dealt with. The fiber orientation distribution was analyzed using the MATLAB software. The results show that the fibers of the original GMT are randomly distributed, but they are oriented along the flow direction after unidirectional flow molding. The orientation becomes more serious as the flow distance increased. The flexural strength and modulus of the material are greater along flow direction than perpendicular to flow direction.