基于Kalman滤波技术的纤维增强复合材料界面断裂参数确定方法

将信号控制领域的Kalman滤波技术运用于确定复合材料的界面参数,得到一种高效精确的材料参数确定方法—Kalman滤波反演法；以确定单纤维增强复合材料顶出试验中界面参数为研究目标,结合有限元分析,将Kalman滤波技术应用到复合材料界面参数反演中,并且引入不同的测量噪声进行计算.反演的结果:一方面获得了SiC(SCS-6)/Ti复合材料的界面参数；另一方面证明了Kalman滤波反演方法的可行性、收敛性和精确性,同时说明该反演计算方法具有消除测量噪音的能力.

Identification of Interface Fracture Parameters of Fiber-reinforced Composite by Using Kalman Filter Technology

The fiber reinforced composite has the advantages of low density,high strength and stiffness,high fatigue resistance,high abrasion and corrosion resistance,good molding and high temperature resistance,which makes it as the brightest material applied in the aerospace and aviation field.In this paper,Kalman filter technology which originally came from the field of signal control is introduced as an inverse analysis to identify the interface parameters of composites.By performing detailed FEM simulation and using the experimental data of the force and displacement curve of the fiber pull-out test,the Kalman filter recursive process is successfully carried out to identify the values of the shear strength and the fracture energy G for the SiC(SCS-6)/Ti material interface.The great advantage of this inverse technology is that the influence of experimental noise can be taken into account.The calculation results show that the rate of convergence to the correct solution depends on the number and the initial estimation of unknown parameters to be identified and the accuracy of the measured data.Our analysis demonstrates that the proposed approach is suitable and capable in the identification of material parameters of the composite interface.