Eigenfrequency Analysis Method For Single-lapAdhesive Joints Of CFRP Laminates

The purpose of this study is to propose a new numerical modeling of single-lap joints of CFRP laminated composites. The eigenvibration mode is always three-dimensional behavior deformation which includes in-plane and out-plane deformations. This indicates that the finite element analysis requires threedimensional solid element. In case that the adherend plane structure is modeled by the conventional solid element, the huge elements and huge solution time are unavoidable. Therefore, we proposed the new numerical model in this study. This model is construction of orthtropic-shell element and beam element, which represent adherend and adhesive, respectively. Shell elements are connected with beam elements in the thickness direction to express adhesive layer. The space between shell and beam elements is combined by rigid link to the correspond the beam elements length to the real adhesive thickness. Using this model, the eigenvibration analysis of canti-levered CFRP single-lap joints structure were performanced. Influences of adhesive and adherend properties and adherend thickness upon eigenfrequency are also discussed. Hoop positions of the 1st and 2nd eigenvibration modes of CFRP adhesive joints are an free edge of specimen and the adhesive, respectively. In particular, it is confirmed that the 2nd eigenfrequency depends on shear deformability in adhesive layer. Transactions on Engineering Sciences vol 21, © 1998 WIT Press, www.witpress.com, ISSN 1743-3533 384 Computer Methods in Composite Materials