Finite element stress response analysis and strength of butt adhesive joints of similar hollow cylinders subjected to impact tensile loadings

摘要

The stress wave propagation in butt adhesive joints of similar hollow cylinders subjected to impact tensile loadings are analyzed in elastic and elasto - plastic deformation ranges using a finite - element method. The impact loading is applied to the joint by dropping a weight. The upper end of the upper adherend is fixed and the lower adherend of which the lower end is connected to a guide bar is subjected to the impact loading. The FEM code employed is DYNA3D. The effect of the adhesive thickness and Young's modulus of the adhesive on the stress wave propagation at the interfaces are examined. In addition, the characteristics of the joints subjected to the impact loadings are compared with those of the joints under static loadings, and the strengths of the joints under static and impact loadings are estimated by using the interface stress distributions. It is found that the maximum value of the maximum principal stress σ{sub}1 occurs at the outside edge of the interface of the lower adherend to which the impact loading is applied. The maximum value of the maximum principal stress σ{sub}1 increases as Young's modulus of the adhesive increases when the joints are subjected to impact loadings. It is found that the characteristics of the joints subjected to impact loadings are opposite to those subjected to static loadings. In addition, experiments were carried out to measure the strain response of the butt adhesive joints subjected to impact and static tensile loadings using strain gauges and the joint strength was also measured. Fairy good agreements are observed between the numerical and the measured results concerning the strain responses and the joint strengths.