en سازه Body structure پژوهشي Research <span style="font-size:11.0pt"><span style="line-height:115%"><span calibri="" style="font-family:">Adhesively bonded joints are a highly effective method for achieving lightweight structural designs, yet assessing their long-term durability remains a significant challenge. Creep, a time-dependent effect caused by sustained mechanical loads, can result in viscous strain within adhesive materials, potentially leading to crack formation in bonded structures over extended periods. This study investigates the creep behavior of adhesive joints under sustained tensile loads, focusing on the effects of adhesive layer thickness and the presence of adhesive fillets. Creep tests conducted over 48 hours revealed that higher load levels result in greater strain accumulation, with thicker adhesive layers showing increased susceptibility to deformation. Additionally, joints with adhesive fillets demonstrated lower creep strain, indicating enhanced resistance to sustained loads. These findings emphasize the importance of adhesive layer thickness and fillet design in optimizing the long-term performance and durability of bonded joints, offering valuable insights for applications where creep resistance is critical for joint reliability and service life.</span></span></span> Adhesive joints, Creep behavior, Adhesive fillet, Adhesive layer thickness 4464 4471 http://ase.iust.ac.ir/browse.php?a_code=A-10-238-5&slc_lang=en&sid=1 Jamal Bidadi jamal_bidadi@auto.iust.ac.ir 180031947532846004750 180031947532846004750 No School of Automotive Engineering, Iran University of Science and Technology (IUST), Tehran, Iran Hamed Saeidi Googarchin hsaeidi@iust.ac.ir 180031947532846004751 180031947532846004751 Yes School of Automotive Engineering, Iran University of Science and Technology (IUST), Tehran, Iran