Stress Analysis and Strength Evaluation of Scarf Adhesive Joints with Dissimilar Adherends Subjected to Static Tensile Loadings

Abstract

The interface stress distributions in scarf adhesive joints with dissimilar adherends under static tensile loadings are analyzed using two-dimensional and three-dimensional finite element calculations. The effects of the adherends and adhesive Young's modulus, the scarf angle and the adhesive thickness on the interface stress distributions are examined. In addition, the joint strength is predicted using the interface stress distributions based on the maximum principal stress theory. It is found that when the scarf angle is around 60˚, the singular stress at the edges of the interfaces is minimum in the 3-Dimensional FEM calculations. Furthermore, it is noticed that the strength of the joints with dissimilar adherends is smaller than that of the joints with similar adherends. For verification of the FEM calculations, the strains in the adherends and the joint strengths were measured in the experiments. The measured strains are in fairly good agreement with those obtained from FEM calculations. Also, the measured joint strength is fairly consistent with the calculated results.

Construction of Analytical Eigensolutions for Isotropic Conical Bodies and Their Application for Estimation of Stresses Singularity

“…In the traditional approach, the coefficients m N and index  of this series are determined by substituting (25) into Eqn. (23). By setting the expressions of the same power of x equal to zero we can obtain the recurrence relations for m N and from the condition of the existence of zero solution for 0 N we get the characteristic equation, determining the index  .…”

“…However, it should be noted that practical implementation of this procedure presents considerable difficulties, because the expressions in front of the function ( ) F x and its derivatives in Eqn. (23) will appear in the form of in finite series. Moreover, the fact that that after construction of series (25) it will be necessary to proceed to the solution ( ) 0 w x through the relation (22), implies that analytical transformations of infinite series will become increasingly complex.…”

Numerical analysis on load-bearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending

“…2 with a magnified view of the CZM elements at the interface and the connection details). The adherends [I], which are high-strength steel [5,6], are defined as isotropic elastic for simplicity. In addition, they are meshed using four-node quadrilateral plane-strain elements.…”

“…[5,6] ν 1 [5,6] containing the interface stiffness, respectively. For each pure mode, the material softens progressively with damage after δ o,i (s u,i ).…”

“…Among all types of adhesive joints, the scarf adhesive joint is commonly adopted to join fiber reinforced laminate composite elements and components for more uniform stress distributions [1][2][3]. The examinations concerning the effects of the scarf angle on the joint performance under uniaxial tensile loading have been carried out in many studies [2,[4][5][6], which show that the failure loads increase as the characteristic angle decreases. Furthermore, the double scarf adhesive joint (DSJ), with the similar advantages as the single scarf adhesive joint (SSJ), is also used widely in mechanical industries.…”