فاطمه اقابراري

In this study, the mechanical behavior and stress analysis of composite-metal adhesive joints under mechanical loading have been investigated. To examine the stress distribution, a combination of numerical simulation (CAE), experimental modeling, and data interpolation has been employed. The effects of adhesive thickness (0.1 mm, 0.2 mm, 0.5 mm) and adhesive length (12.5 mm, 25 mm, 37.5 mm) on the distribution of normal (S11), shear (S12), and transverse (S22) stresses have been analyzed. To understand the stress variation patterns, a specific path within the adhesive region—located along the longitudinal direction, centered in both width and thickness—was considered, enabling the eva‎luation of stress distribution along the bondline. To validate the results, stress values obtained through data interpolation were compared with those from finite element method (FEM) analysis using CAE software, and the R² index and mean percentage error were calculated to assess the level of agreement. The results indicated that adhesive thickness and length significantly influence stress concentration and failure modes in adhesive joints. Increasing the adhesive thickness reduced local stress magnitudes but led to broader stress variation ranges. Experimental investigations also revealed three failure modes in these joints: adhesive, cohesive, and adherend failure. With increased adhesive thickness, the likelihood of adhesive failure decreased while failure within the adherend increased. To visualize the stress distribution and its variations across different samples, ridgeline plots were used, effectively illustrating stress trends for various parameters. Ultimately, the findings of this research can contribute to improving the design of adhesive joints in engineering structures, aerospace applications, and the automotive industry.

اتصالات چسبي , روش اجزاي محدود , اتصال كامپوزيت-فلز

Adhesive joints , finite element method , Composite-metal bonding

Fateme Aghabarari

Dr.Hamed Saeidi