复合材料变厚层板热压成型缺陷类型与成因实验研究  

Experimental study on type and cause of defects in variable thickness composite laminates during hot pressing process

作　　者：顾轶卓[1] 张佐光[1] 李敏[1] 谢富原[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《复合材料学报》2008年第2期41-46,共6页Acta Materiae Compositae Sinica

基　　金：国家973项目(2003CB615602);北京航空航天大学博士研究生创新基金资助项目

摘　　要：采用热压机工艺与热压罐工艺两种成型方法制备了玻璃纤维/环氧648变厚度层板,研究了两种工艺下缺陷的形成机制及铺层方式和变厚梯度对缺陷程度和分布的影响。结果表明:纤维分布不均、富树脂、分层是主要缺陷类型,其中纤维分布不均由树脂二维流动引起,并与纤维不连续区、纤维层渗透特性以及外压的均匀性有关;富树脂主要是纤维的不连续性造成的;而分层缺陷与纤维分布和热膨胀各向异性紧密相关。研究结果对变厚度复合材料层板的缺陷消除和成型质量控制有重要的指导意义。The glass fiber/epoxy resin 648 variable thickness laminates were prepared with the hot press and the autoclave methods. The mechanism of defect formation in the two processings was investigated, and the effects of the lay-up type and ply-drop gradient on the extent and distribution of defects were studied. The results show that fiber asymmetric distribution, rich resin and delamination are the major types of defects. Two dimensional resin flow results in fiber uneven distribution, which is influenced by the fiber discontinuous area, permeability of the fiber bed and the uniformity of applied pressure. Rich resin results from the fiber discontinuous area. Delamination has close relations with fiber distribution and anisotropy in thermal expansion. The results are valuable for eliminating the defects and controlling the processing quality in variable thickness laminate structures.

关 键 词：复合材料 热压工艺 变厚度层板 缺陷 

分 类 号：TB332[一般工业技术—材料科学与工程]