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>An investigation of interfacial stresses in adhesively-bonded single lap joints subject to transverse pulse loading
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An investigation of interfacial stresses in adhesively-bonded single lap joints subject to transverse pulse loading
Debonding in adhesively-bonded lap joints is a detrimental failure mode contingent upon the level of stresses develped in the adhesive. In this work, an analytical model is developed to estimate the peel and shear stresses in an isotropic elastic adhesive in a single lap joint subjected to transverse pulse loads. The proposed analytical model is an extension of the mathematical models developed by He and Rao (Journal of Sound and Vibration 152 (3), (1992) 405-416, 417-425) to study the coupled transverse and longitudinal vibrations of a bonded lap joint system. The adhesive, in this work, is modelled as an elastic isotropic material implemented in Abaqus 6.9-1. The interfacial stresses obtained by finite element simulations were used to validate the proposed analytical model. The maximum peel and shear stresses in the adhesive as predicted by the analytical model were found to correlate well with the maximum stresses predicted by the corresponding numerical models. The peel stresses in the adhesive were found to be higher than shear stresses, a result which is consistent with intuition for transversally loaded joints. The analytical model is able to predict the maxium stresses in the edges where debonding initiates due to the highly asymetrical stress distribution as observed in the finite element simulations and experiment. This phenomenon is consistent with observations made by Vaidya et al. (International Journal of Adhesion & Adhesives 26 (2006) 184-198). The stress distribution under uniformily distributed transverse pulse loading was observed to be similarly asymetric.
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机译:粘合剂搭接接头的脱粘是一种有害的破坏模式,具体取决于粘合剂中产生的应力水平。在这项工作中,建立了一个分析模型来估算承受横向脉冲载荷的单搭接接头中各向同性弹性粘合剂中的剥离应力和剪切应力。提出的分析模型是He和Rao(Journal of Sound and Vibration 152(3),(1992)405-416,417-425)开发的数学模型的扩展,用于研究粘结棉卷的横向和纵向振动耦合关节系统。在这项工作中,粘合剂被建模为Abaqus 6.9-1中实现的弹性各向同性材料。通过有限元模拟获得的界面应力被用来验证所提出的分析模型。发现分析模型所预测的粘合剂中的最大剥离应力和剪切应力与相应数值模型所预测的最大应力具有很好的相关性。发现粘合剂中的剥离应力高于剪切应力,这一结果与横向加载接头的直觉是一致的。该解析模型能够预测由于有限元模拟和实验中观察到的高度不对称应力分布而在开始剥离的边缘处的最大应力。这种现象与Vaidya等人的观察一致。 (国际粘合与粘合剂期刊26(2006)184-198)。观察到在均匀分布的横向脉冲载荷下的应力分布类似不对称。
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