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首页> 外文期刊>International Journal of Adhesion & Adhesives >Stress analysis of double-lap bi-material joints bonded with thick adhesive
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Stress analysis of double-lap bi-material joints bonded with thick adhesive

机译：用厚粘合剂粘合双圈双材料接头的应力分析

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摘要

Mechanics of double-lap Steel-to-CFRP adhesively-bonded joints loaded in tension are investigated experimentally using Digital Image Correlation (DIC) and Acoustic Emission (AE), analytically using a one-dimensional closed-form solution and numerically with Finite Element analysis. The double-lap bi-material joints are fabricated of a steel core adhesively bonded to two CFRP skins with adhesive thickness of similar to 8 mm, using an Epoxy-based and MMA-based adhesives. In order to capture the in-plane deformation of the joint, full field strain/displacement maps are obtained using DIC. This data is used to validate the shear-lag model predictions of the adhesive shear stress/strain distribution as well as the linear-elastic Finite Element Model (FEM) results. In addition, they are used to capture the susceptible damage locations and their effect on the displacement contour maps, strain distribution and load transfer between the joint's different constituents. A correlation between the DIC displacement and the AE signals is obtained for damage detection in both joints. Moreover, a good agreement amongst the analytical, FE and DIC strain/stress distributions along the bond-line is observed. This study introduces the analytical shear-lag model as an alternative to predict the stress state in thick-adhesive double-lap joints, with an acceptable level of accuracy and robustness.
机译：通过数字图像相关（DIC）和声发射（AE）在实验上使用一维闭合形式溶液进行实验研究了张力的双圈钢到CFRP粘粘粘合接头的机械图，并使用一维闭合形式溶液和有限元分析。使用环氧基和基于MMA的粘合剂，由粘合粘合到两个CFRP皮粘合到两个CFRP皮肤的钢芯粘合到两个CFRP皮下的双辊粘附。为了捕获接头的面内变形，使用DIC获得全场应变/位移图。该数据用于验证粘合剪切应力/应变分布的剪切滞后模型预测以及线性弹性有限元模型（FEM）结果。此外，它们用于捕获易感损坏位置及其对关节不同成分之间的位移等高图，应变分布和负载转移的影响。在两个接头中获得DIC位移和AE信号之间的相关性。此外，观察到沿着键合线的分析，Fe和DIC应变/应力分布之间的良好一致性。本研究介绍了分析剪切 - 滞后模型作为预测厚粘性双圈接头中应力状态的替代方案，具有可接受的精度和鲁棒性。

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