Optimizing Plate Adhesion: A Model Using Digital Image Correlation and Finite Element Analysis
DOI:
https://doi.org/10.24237/djes.2026.19209Keywords:
Single-Lap Joints, Adhesive Bonding, Finite Element Analysis (FEA), Digital Image Correlation (DIC)Abstract
The durability and strength of single-lap adhesive joints are influenced by numerous factors. Among which are stress and strain concentrations at the overlap edges. This research investigates a method for improving these joints through a proposed geometric design incorporating a circular overlap region with a central hole. The primary objective is to reduce strain concentrations within the adhesive layer, which is an important factor governing joint strength and durability. An aluminum alloy was employed as the adherent material, in conjunction with an epoxy adhesive. Numerical and experimental analyses, utilizing the Finite Element Method (FEM) and Digital Image Correlation (DIC) techniques, were used to evaluate strain distribution and validate the proposed design. Three models of different inner circle diameter were tested. The tested where made such that the adherent area are the same of corresponding conventional rectangular area. Results indicate that the modified configuration achieved a reduction in normal strain within the adhesive layer ranging from 2.8% to 8.6% compared to the conventional design. Furthermore, strain concentrations at the overlap edges were redistributed, promoting a more uniform stress distribution and potentially enhancing joint strength. Very good agreement was observed between FEM and DIC results, varying from 69% to 95%, with an average exceeding 80% for most measurement points. These findings demonstrate the possibility of simple geometric modifications to enhance adhesive joint performance.
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