FEM stress analysis and strength prediction of scarf adhesive joints under static bending moments

On the interfacial strength of bonded scarf joints

“…Despite the scatter of data, experimental results show that the average of maximum principal tensile stresses at failure does not vary significantly with interface dimension. Similar to the reports in [1,[4][5][6], the measured maximum principal tensile stresses of scarf joints at failure decreases as the scarf angle w increases when w 6 90°. We obtained numerically the order of the singularity at three-dimensional interface corners and edges and correlated fracture initiation with critical values of the stress intensities of the singular fields near the three-dimensional interface corner.…”

“…Various methods exist in the literature for predicting the strength of bonded scarf joints, among which the following two methods are the most widely used: (1) the maximum principal stress criterion [1,5]; (2) linear elastic fracture mechanics where failure is assumed to occur at a critical value of mode-dependent interfacial fracture toughness [2][3][4]6]. In general, a stress singularity of the form K k r may develop at the interface corner.…”

“…They proposed an approach to characterizing fracture initiation at three-dimensional material interface corners using critical values of the stress intensities considering the effect of interface dimension. The effect of bond thickness upon the strength of adhesive joint has been investigated extensively by numerous researchers [3][4][5][6]. In general, the strength of adhesive joints increases as the bond thickness decreases.…”

“…stress singularity near the vicinity of interface corners and edges. Many researchers have investigated these features by adopting scarf joints with various scarf angles [1,[4][5][6][7][8][9][10][11]. While some investigations have been carried out on the stress analysis and strength prediction of adhesive scarf joints, the relationship between the stress singularity and strength is not clear yet due to the complexity of stress field at various three-dimensional (3-D) bi-material interface corners and edge geometries.…”

Study on the creep behavior of bonded metallic joints

“…Many studies have focused on the behavior of the stress distribution along the joint [1][2][3], its failure mechanisms [4][5][6], the influence of substrate surface treatment [7,8], shape factors of the bonded area [9,10] and ways to increase the mechanical strength of the joint. However, little is known about its time dependent behavior when statically loaded, in other words, its behavior under creep.…”