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Lifetime Prediction for Fatigue Damage in Bonded Joints

机译：粘结接头疲劳损伤的寿命预测

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摘要

A procedure is outlined and programmed in software in order to predict the fatigue threshold in composite adhesively bonded joints. Two different joint configurations are considered in this study, namely, Double Lap (DL) and Lap Strap (LS). The substrates are made of either uni-directional (UD) or multi-directional (MD) composite laminates and bonded together using an epoxy film adhesive. The theory of continuum damage mechanics has been used to develop damage evolution laws for UD/DL joints at different temperatures. The number of cycles to failure was then expressed in terms of the stresses in the adhesive layer and material constants (damage parameters). The stresses were calculated from nonlinear finite element analyses. In order to calculate the damage parameters, a system of equations, in which the number of unknowns is less than the number of equations, has been derived using a combination of experimental data, finite element results and the damage law. The system of equations has been solved using the concept of pseudo-inverse by solving a singular value decomposition problem. Software has been developed to automatically calculate the damage parameters and produce the required load-number of cycle to failure curves. From those curves, the fatigue crack initiation thresholds were predicted for several joints, e.g. MD/DL, UD/LS and MD/LS joints. Good predictions were found.
机译：概述了程序并在软件中进行了编程，以预测复合粘合接头的疲劳阈值。在这项研究中考虑了两种不同的关节构型，即双膝（DL）和膝带（LS）。基材由单向（UD）或多向（MD）复合层压板制成，并使用环氧薄膜胶粘剂粘结在一起。连续损伤力学理论已被用于开发不同温度下UD / DL接头的损伤演化定律。然后以粘合层中的应力和材料常数（损伤参数）表示失效循环的次数。根据非线性有限元分析计算应力。为了计算损伤参数，结合了实验数据，有限元结果和损伤定律，推导了一个方程组，其中未知数小于方程组。通过使用奇异逆的概念，通过解决奇异值分解问题，解决了方程组。已经开发了软件来自动计算损坏参数并生成所需的循环次数到失效曲线的载荷数。根据这些曲线，可以预测几个接头的疲劳裂纹萌生阈值。 MD / DL，UD / LS和MD / LS接头。发现了很好的预测。

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