Experimental an‎d numerical investigation of the durability of adhesive joints under long-term cyclic loading for maintenance

10/21/2026 12:00:00 AM

This study aims to experimentally an‎d numerically investigate the durability of adhesive joints under cyclic loading in order to develop maintenance strategies with a focus on the reliability factor in the design of bonded structures. Introducing a design approach that incorporates a reasonable safety factor is essential for ensuring the structural reliability of adhesive joints. In this research, the long-term cyclic durability of adhesive joints was eva‎luated experimentally an‎d numerically to propose a strategic framework for the design of bonded structures. Double Cantilever Beam (DCB) specimens were fabricated using 6061 aluminum alloy substrates bonded with Araldite 2015 epoxy adhesive, after optimized surface preparation to achieve cohesive adhesive failure. Quasi-static tensile tests were performed to determine the initial mechanical behavior, an‎d the fracture energy was calculated using inverse methods an‎d the Compliance-Based Beam Method (CBBM). Stiffness an‎d critical traction parameters were then obtained through numerical simulations conducted in ABAQUS. Subsequently, fatigue tests were carried out until failure to assess the effect of the number of cycles on the degradation of mechanical properties, with a focus on maintaining a reasonable safety factor. Analysis of the load–displacement curves revealed that with increasing cycle count, the maximum load, fracture energy, an‎d crack initiation point decreased, indicating the progressive development of damage an‎d crack propagation. The findings provide a foundation for predicting the durability an‎d reliability-based design of adhesive joints, as well as for developing maintenance protocols in industrial applications, particularly in the automotive sector. Accordingly, this study emphasizes preventive maintenance as an effective strategy to extend the service life of adhesive-bonded structures.

اتصال چسبي , مدل ناحيه چسبناك , بارگذاري چرخه‌اي , روش تير مبتني بر نرمي , نگاهداشت

adhesive joint , cyclic loading , cohesive zone model , CBBM , maintenance

muhammad beigi harchegani

dr. mohammad hassan shojaeefard - dr. mohammadreza gheibi