## 1 Introduction
They investigated in which area the acting force acts on. They showed that one of the two adhesives compared has a fragile structure and the other has a more stable structure. Given these circumstances, it has been concluded that bonding errors can be minimized [38]. In 2011, [PERSON], et al. compared the shear strength of single lap joint rods from different materials. They combined three different materials. These materials are composite with carbon/epoxy layer, high modulus steel, and 6082-T6 aluminum alloyed materials. The material hardness affects the shear strength, and they stated that the use of the hardest material would provide the highest shear strength. And they showed that the length of the lapping would affect the shear strength which varies according to the material, while the numerical analysis showed that the rotation of the sample decreased with increasing material hardness and resulted in a smoother stress distribution for the six adhesives. They stated that this contributed to the development of shear strength; it was also confirmed by experimental results. They produced high shear strength for steel/steel bonding, but stated that the composite/composite shear strength was lower. They concluded that increasing the hardness of the material would provide a stronger connection [39]. In a 2012 study, [PERSON] also conducted an analytical elasto-plastic stress analysis used to calculate the shear stress of the single-lap ductile adhesive joint. In this study, the adhesive Dp 460 was used. [PERSON] used the von Mises criterion to check the flow state of the adhesive. During the analysis, he assumed that the shear stress was constant along the adhesive thickness and ignored the bending moment. The analysis results were confirmed by using finite element analysis. Analytical and numerical results were coherent with each other [40]. In their 2013 study, [PERSON], et al. experimentally and numerically examined geometric parameters such as overlap length and material thickness for low strength steels (medium and low carbon steels), and material parameters such as adhesive stress-strain. They observed injury patterns in different situations and determined the first place of injury. Unlike the joints made of high-strength steel, they stated that the damage mechanism depended on the leakage of the bonded material. They concluded that the localized tensions at the edges of the winding caused the joining errors in low and medium carbon steels [41]. In 2014, [PERSON] and [PERSON] determined an accurate damage prediction criterion usable to predict the stress of tear damage to fibers by using a field-based approach. They experimentally determined the type of damage by using carbon fiber composites, epoxy adhesive and splices of various sizes. They tested several voltage/strain-based failure criteria for composites. They calculated the size of the critical fields with the help of finite element analysis by using the known collapse loads of single lap joints. As a result, they found that the Azzi-Tsai criterion (Norris) was appropriate for estimating the stress of fiber tear damage in single rots [42]. In a paper in 2018, [PERSON] made an error analysis on an ANSYS Workbench by applying shear and bending loads to double lap joints with hybrid bonded and single bolted laminated composite adhesions exposed to axial effects by using three-dimensional finite element simulation. Simulation analysis was compared with literature studies. It was concluded that there was a significant increase in bonded joints at the rate of 56% when compared to bonded joints [43]. In their study in 2014, [PERSON] and [PERSON] tested nine aluminum-epoxy single lap joint samples with different adhesive thicknesses and outer bonded segment ratios under tensile loading. They estimated the deviations of single lap joint samples by using the digital image correlation method. They also examined the Hart-Smith, Goland and Reissner models and modified the Goland and Reissner models to compare the theoretical prediction by using experimental data.