en سازه Body structure پژوهشي Research <span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times=""><span style="color:black">The aim of the study was to examine the deformation modes and also degradation of an adhesively bonded rectangular cross section beam used in the automotive body structure. The study included: (1) performing new experimental investigations on the three-point bend behavior of a rectangular cross section beam made by adhesive bonding method. (2) developing a finite element (FE) model to predict the mechanical load displacement behavior and also the degradation modes (i.e. delamination between the adhesive layer and beam wall). The agreement between experimental and FE results demonstrates that the investigated structural element&#39;s numerical model was created utilizing accurate assumptions. Finally, the effects of beam wall thickness and overlap length have been investigated in a parametric study using the validated FE model. It was shown that increasing the beam wall thickness resulted in delamination between the adhesive layer and beam wall.</span></span></span></span> Thin-walled beam Adhesive joint Energy absorption Cohesive zone model (CZM) Automotive bumper beam 4085 4091 http://ase.iust.ac.ir/browse.php?a_code=A-10-238-4&slc_lang=en&sid=1 J Bidadi 180031947532846004248 180031947532846004248 No Iran University of Science and Technology (IUST) H Hampaiyan Miandowab1 180031947532846004249 180031947532846004249 No Iran University of Science and Technology (IUST) H Saeidi Googarchin 180031947532846004250 180031947532846004250 Yes Iran University of Science and Technology (IUST)