PSI - Issue 81

Nazar Loboda et al. / Procedia Structural Integrity 81 (2026) 221–227

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4. Conclusions • An experimental technique was developed for testing adhesive joints at reduced temperatures down to -60 °C, which made it possible to investigate their behavior under conditions close to those encountered in aerospace applications. Based on the tests of aluminum specimens bonded with a polyurethane adhesive, the average ultimate shear strength of about 14 MPa was determined, confirming the high reliability of the joints over a wide temperature range. • Numerical models of the adhesive joint have been developed and verified using cohesive element and cohesive contact approaches. Parametric studies of the influence of stiffness modules, limit stresses, and fracture energy on crack propagation and joint failure have been conducted. It has been established that the values of the cohesion model parameters obtained from experimental data provide good agreement between the calculated and experimental force-displacement diagrams (the discrepancy does not exceed 5%). This confirms the correctness of the developed methodology and the reliability of the model. • A study of the influence of finite element mesh size on the numerical modeling results using cohesive elements and cohesive contact was carried out. The optimal element size of 0.5 mm was established for both types of models. References Campilho, Raul & Banea, M. & Neto, J.A.B.P. & Silva, L.F.M.. (2013). Modelling adhesive joints with cohesive zone models: Effect of the cohesive law shape of the adhesive layer. International Journal of Adhesion and Adhesives. 44. 48–56. 10.1016/j.ijadhadh.2013.02.006. Fakoor, Mahdi & Daneshjoo, Zahra & Shirzadeh, Zahra. (2025). Simulating delamination in composite laminates with fracture process zone effects: A novel cohesive zone modeling approach. Engineering Fracture Mechanics. 315. 110834. 10.1016/j.engfracmech.2025.110834. Gomes, C.F.F. & Campilho, Raul & Moreira, Raul & Madani, Kouider & Djebbar, S.C.. (2025). Adherend effect on the tensile behavior of tubular adhesive joints. Procedia Structural Integrity. 72. 34-42. 10.1016/j.prostr.2025.08.071. Methfessel, Thomas & Becker, Wilfried. (2025). An extended sandwich model for structural integrity analysis of adhesive bondings. Procedia Structural Integrity. 72. 105-112. 10.1016/j.prostr.2025.08.080. Morais, A.B.. (2025). A modified direct method to determine the bondline mode I traction-separation law from the adhesively bonded metal double cantilever beam specimen. Engineering Fracture Mechanics. 315. 110861. 10.1016/j.engfracmech.2025.110861. Stuparu, Florin & Apostol, Dragos & Constantinescu, Dan & Picu, Catalin & Sandu, Marin & Sorohan, Ştefan. (2016). Cohesive an d XFEM evaluation of adhesive failure for dissimilar single-lap joints. Procedia Structural Integrity. 2. 316-325. 10.1016/j.prostr.2016.06.041. Yang, Mo & Xi, Jianan & Xuan, Hao & Wang, Yikun & Zhang, Wen. (2025). Mechanical behavior and failure mechanism study of CFRP laminate page-type adhesive joint. Engineering Fracture Mechanics. 316. 110895. 10.1016/j.engfracmech.2025.110895.