Abstract
This research innovatively considers the Zero Point Structural Stress (ZPSS) approach to evaluate the stress concentration factors (SCFs) of the CFRP-reinforced T/Y-joints. To begin, multiple sets of credible experimental data and Finite Element (FE) results were selected to verify the accuracy of the proposed FE model. The comparison results showed that the ZPSS approach accurately estimated the SCF of tubular T/Y-joints reinforced with CFRP. Furthermore, the ZPSS approach, which considers the stress gradient through the thickness, shows more accurate results than the HSS approach, which considers only the stress at the outer surface of the chord. Then, 132 FE models were simulated to analyze the effects of the joint geometric dimensions and the CFRP laminates on the SCFs of the CFRP-reinforced tubular T/Y-joints. Finally, a parametric equation is proposed based on the FE results to predict the SCFs of tubular T/Y-joints reinforced with CFRP under axial compression loads.
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