Composite structures have wide applications in mechanical fields. Such structures consist of several joints, which may run a risk of eventually weakening a structure in case of excessive weight. It is, therefore, necessary to strengthen a structure so as to reduce the chance of failure. The present study was undertaken with a model of tubular T-joint having adhesive fillet. It also focussed on three-dimensional stress analysis on adhesive fillet. The model was made of laminated fibre-reinforced polymer (FRP) composite tubes with adhesive triangular fillet, subjected to axial compressive loading. The modelling and analysis were carried out by using finite element method (FEM) for three different joints with different geometrical parameters. The model was validated by using the available finite element model results. Based on the present finite element model results, the axial stress (σ_z) at brace-fillet intersection, circumferential stress (σ_φ) and circumferential-axial stress (τ_φr) at chord-fillet intersection were found to have greater effect as compared with other stress components. The maximum value of stress component could be noticed in between the brace and the chord joint region, which could eventually cause failures. The effect of adhesive fillet on deflection was studied in details by using ANSYS 18.1, and results showed that deflection of adhesive fillet model could be reduced by 12.36% as compared with non-fillet condition. Based on the present research findings, the presence of adhesive fillet was found to significantly reduce deflection effect as well as improve joint strength and stability of the structure.

中文翻译：

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层压FRP复合管胶粘圆角管T形接头在轴向压缩载荷下的详细研究

复合结构在机械领域具有广泛的应用。这样的结构由多个接头组成，如果重量过大，可能会导致最终削弱结构的风险。因此，有必要加强结构以减少失败的机会。本研究是使用具有粘性圆角的管状T型接头进行的。它还专注于胶粘角的三维应力分析。该模型由层压的纤维增强聚合物（FRP）复合管制成，该复合管带有粘性三角形圆角，承受轴向压缩载荷。使用有限元方法（FEM）对具有不同几何参数的三个不同关节进行了建模和分析。通过使用可用的有限元模型结果对模型进行了验证。σ _Ž）在大括号圆角相交，周向应力（σ _φ）和圆周向应力（τ _φR与其他应力分量相比，弦和圆角交点处的）影响更大。应力分量的最大值可能出现在支架和弦节区域之间，这最终可能导致失效。利用ANSYS 18.1对胶条的挠度影响进行了详细研究，结果表明，与非胶条相比，胶条模型的挠度可降低12.36％。基于目前的研究结果，发现粘合剂圆角的存在可显着降低挠曲效果，并改善接头强度和结构稳定性。