Yasumasa Nakanishi

Finite Element Analysis of Vibration Damping for Woven Fabric Composites

The estimation method of the damping properties for woven composites has proposed. The proposed method has been applied to the plain woven composites. From these results, it is recognized that the computational damping properties have agreed with the experimental ones. Next, the effect of angle of fiber bundle on material damping of plain woven composites has investigated. The results show that the damping ratio is highest at angle of 45 degree.

Identification of Layer Elastic Parameters for Angle-ply Laminated Plates and Shells (Comparison of Numerical and Experimental Results)

An inverse analysis method has already been proposed by the authors to identify elastic parameters for laminated composite materials using the experimental modal analysis technique, the FEM eigenvalue analysis and the nonlinear optimization method. To investigate the application of the proposed inverse analysis method, the method is applied to an angle-ply laminated square plate and an angle-ply laminated shallow cylindrical shell made of the same composite materials and made by the same curing condition. First, by applying the experimental modal analysis technique to the angle-ply laminated square plate and shallow cylindrical shell, natural frequencies and mode shapes are obtained. Next, by using the obtained natural frequencies and mode shapes, the layer elastic parameters for the test pieces are identified. On the other hand, the layer elastic parameters are experimentally measured with prepared specimen. These identified layer elastic parameters were compared, and found to agree well, with the measured layer elastic parameters. * Corresponding Author: Associate Professor Kenji Hosokawa Faculty of Engineering, Chubu University 1200 Matsumotocho, Kasugai, Aichi 487-8501 Japan Tel:+81-568-51-1 111 Fax: +81-568-51-1194 E-mail: hosokawa@isc.chubu.ac.jp