自动铺放工艺参数对干纤维预成型体工艺性能的影响  

EFFECT OF AUTOMATIC PLACEMENT PROCESS PARAMETERS ON PROCESS PERFORMANCE OF DRY FIBER PREFORMS

作　　者：刘姝呈 李林秀 潘利剑[1,2] 宁博 张家铭 岳广全 刘卫平 LIU Shu-cheng;LI Lin-xiu;PAN Li-jian;NING Bo(Donghua University,College of Material Science and Engineering,Shanghai 201620,China;Donghua University Center for Civil Aviation Composites,Shanghai 201620 China;Composite Center,Shanghai Aircraft Manufacturing Company Limited,Shanghai 201324,China)

机构地区：[1]东华大学材料科学与工程学院,上海201620 [2]东华大学民用航空复合材料协同创新中心,上海201620 [3]上海飞机制造有限公司复合材料中心,上海201324

出　　处：《复合材料科学与工程》2020年第11期93-101,共9页Composites Science and Engineering

摘　　要：相比于航空航天领域常用的预浸料/热压罐工艺,干纤维自动铺放/液体成型工艺可成型出具有相同的纤维体积含量和力学性能的复合材料,且其成本较低。干纤维束可以通过自动铺丝机在加热和加压工艺条件下铺叠成预成型体,其渗透率、纤维体积含量和压缩特性对成型后的复合材料性能有较大的影响。本文针对自动铺放技术的干纤维丝束,通过调控温度和压力制备了不同层间结构的预成型体,研究了自动铺放工艺参数对预成型体性能的影响。结果表明:在一定的压力下,升高铺放温度,预成型体渗透率降低,厚度减小,抗变形能力增强,纤维体积含量提高,在175℃时可达到58.45%;在一定温度下,当增加铺放压力,预成型体厚度、渗透率、抗变形能力和纤维体积含量有同样的变化趋势,0.2 MPa时,纤维体积含量可达55.39%。这主要与干纤维表面定型剂及导流纤维的物理化学变化有关。Compared to the prepreg/autoclave process usually used in aerospace,the automatic placement of dry fiber/liquid molding can manufacture the same composite materials,as measured by fiber volume content and good mechanical properties,but at a lower cost.The preforms are made of dry fiber tows with heating and pressing by Automatic Fiber Placement(AFP)machine,and their permeability,fiber volume contents and compression characteristics have a great influence on the properties of the composite materials.In this paper,the preforms of different interlayer structures were prepared by adjusting the temperature and pressure of the dry fiber tow within the automatic placement technology.The influence of the automatic placement process parameters on the performance of the preforms was studied.The results show that at a constantly held pressure,as the temperature increases,the thickness and permeability of the preforms decrease,and their deformation resistance and fiber volume content increase.The volume content is 58.45%at 175℃.Also,at a constantly held temperature,as the pressure increases,the thickness,permeability,fiber volume content and deformation resistance of the preforms have the same changing trend as increasing temperature,and the volume content is 55.39%at 0.2 MPa.This is mainly related to physical/chemical changes of dry fiber surface with the styling agent and the flow guiding fiber.

关 键 词：自动铺放 预成型体 渗透率 压缩特性 纤维体积含量 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]