Title: Hybrid Fastening System with Dissimilar Substrates: An Experimental and Numerical Approach

Authors: Kunle Adeyemo, Andrew Valentine, Syed Fahad Hassan, Mahmoodul Haq

DOI:

Abstract: Delamination caused by drilling of the composite reduces the strength of the dissimilar single-lap bolted joint (DSBJ) by up to 60%. A DSBJ with an adhesive insert, known as a hybrid fastening system (HFS), can reduce this delamination, eliminate bolt-adherend slip, and improve joint strength. In our previous work, HFS with similar composite substrates showed improved peak load and reduced delamination compared to conventional composite single-lap bolted joints. Although these improvements were achieved with similar Glass Fiber Reinforced Polymer (GFRP) substrates, the analysis of HFS with dissimilar substrates has not been studied from a numerically validated experimental perspective. In this study, the mechanical response of HFS with dissimilar substrates was compared with that of DSBJ using both experimental and numerical analyses. A user subroutine that utilizes Puck failure criteria and the element-weakening method was integrated into ABAQUS for the composite’s intralaminar damage initiation and evolution. The experimental result indicated that the peak loads of HFS with dissimilar substrates were 9 times higher than the slip loads of conventional dissimilar bolted joints. Overall, the load-displacement curves observed in the simulation results were in good agreement with the experimental results. Importantly, the experimentally validated model can be used as a design tool to explore the design space and perform additional parametric studies beyond the experimental data.

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Conference: SAMPE 2026

Publication Date: 2026/04/27

SKU: 35

Pages: 15

Price: $30.00