基于自动铺放技术的高精度变刚度复合材料层合板屈曲性能  

Buckling performance of high-precision variable stiffness composites laminate based on automatic placement technology

作　　者：卫宇璇 张明 刘佳 刘硕 崔志刚 WEI Yuxuan;ZHANG Ming;LIU Jia;LIU Shuo;CUI Zhigang(Beijing Spacecraft,Beijing 100094,China)

机构地区：[1]北京卫星制造厂有限公司,北京100094

出　　处：《复合材料学报》2020年第11期2807-2815,共9页Acta Materiae Compositae Sinica

摘　　要：基于自动铺放技术制备的曲线变刚度复合材料层合板,通过定制面内刚度,可有效提高结构的抗屈曲性能。在铺放过程中,铺放轨迹的路径规划是实现变刚度设计的关键技术之一。鉴于此,本文分别以纤维角度线性变化曲线、等曲率曲线及二次Bezier曲线构成的纤维轨迹为研究对象,对其压缩屈曲性能进行参数化分析。并利用有限元模型研究了铺丝头上丝带宽度对层合板型面精度和抗屈曲力学性能的影响。结果表明:在压缩工况下,二次Bezier曲线路径的抗屈曲性能最佳,等曲率曲线路径受曲率约束的影响最小。铺丝头丝束宽度一定,丝带宽度与重叠区域面积和抗屈曲性能呈负相关。使用最大的丝带宽度可最大程度地减小重叠区域面积,提高结构的型面精度,同时保证结构屈曲性能提高37.3%。The buckling resistance of the variable stiffness composite laminates laid by the automatic placement can be effectively improved by tailoring the in-plane stiffness.During the placement process,laying the trajectory path planning is one of the key technologies to achieve variable stiffness design.So,the fiber trajectories composed of angle linear variation,constant-curvature curve and quadratic Bezier curve were taken as the research object,and the parametric analysis of its compression buckling performance was carried out.Finally,the influence of tape width on the surface profile accuracy and buckling resistance mechanical properties was studied using a finite element model.The results show that under the compression condition,the secondary Bezier curve has the best buckling resistance,and the equal curvature curve is least affected by the curvature constraint.The width of the tape is negatively correlated with the area of the overlap area and the buckling resistance,when the tow width of the fiber placement head is constant.Using the largest tape size can minimize the overlapping area and improve the profile accuracy of the composite structure.At the same time,it is guaranteed that the buckling performance of the structure is improved by 37.3%.

关 键 词：变刚度 屈曲特性 自动铺放 BEZIER曲线 纤维丝束 

分 类 号：TB332[一般工业技术—材料科学与工程]