自动铺丝过程中预浸料的侧向弯曲

Lateral Bending of Prepreg During Automated Fiber Placement

根据自动铺丝过程中预浸料的受力特点,建立预浸料的侧向弯曲变形模型。利用最小势能原理、瑞利-利兹法以及相关的复合材料力学理论,推导出预浸料侧向屈曲半径公式。研究自动铺丝温度、压力、速度、黏附力等主要工艺参数对侧向弯曲性能的影响,并用自动铺丝机铺放不同半径的预浸料圆弧进行验证。结果表明:随着温度增大、压力和速度减小,预浸料的侧向弯曲性能提高;增加预浸料黏附力可显著提高其侧向弯曲性能,符合理论分析结果。

The lateral bending model of prepreg was established,based on the mechanical characteristics during automated fiber placement（AFP）.The buckling radius was deduced by using the principle of minimum potential energy,Rayleigh-Ritz method and the relevant composite material mechanics.Influence of main process parameters,such as layup temperature,layup pressure,layup speed,prepreg tack,etc,on lateral bending capability was analyzed.The lateral bending experiments indicate its effectiveness,using the AFP lay down prepreg arcs with different radii.The results show that the lateral bending performance of prepreg increases with the increasing of temperature,pressure,and decreasing of speed.And the increasing of prepreg tack can significantly improve the lateral bending performance,which all agree with theoretical prediction well.