A Novel Mean Stress-Independent Fatigue Model for Bonded Joints With Ductile Adhesives

Volume 3: Advanced Materials: Design, Processing, Characterization, and Applications Pub Date : 2021-11-01 DOI:10.1115/imece2021-70176

Marco Gerini-Romagnoli, S. Nassar

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Abstract

A mean stress-independent lap shear fatigue model is proposed for Aluminum 2024 alloy Single Lap Joints (SLJ) that are bonded with ductile, polyurethane-based, adhesive. Fatigue data is generated in the High Cycle Fatigue range, for 4 values of mean stress and multiple levels of alternating load. Individual S-N curves are constructed, for each value of mean stress, and the results are statistically analyzed. A separate logarithmic regression of the entire pool of data is performed, considering maximum stress and fatigue life of the samples. The test data align along the same regression line. As a result, the amount of tests to perform for durability characterization of single lap joints bonded with ductile adhesive can potentially be reduced. High sampling frequency information of the displacement of the specimens during fatigue tests is periodically acquired and filtered. The creep-like curve describing the evolution of the mean displacement during the fatigue tests suggests that cold flow phenomena could trigger fatigue failure, rather than the propagation of a crack.

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一种新的塑性胶粘剂粘结接头平均应力无关疲劳模型

提出了一种基于韧性聚氨酯胶粘剂的2024铝合金单搭接接头(SLJ)的平均应力无关搭接剪切疲劳模型。在高周疲劳范围内生成4个平均应力值和多个交变载荷水平的疲劳数据。对每个平均应力值分别构造S-N曲线，并对结果进行统计分析。考虑到样品的最大应力和疲劳寿命，对整个数据池进行了单独的对数回归。测试数据沿着相同的回归线排列。因此，对使用韧性粘合剂粘合的单搭接接头的耐久性特性进行测试的数量可能会减少。对疲劳试验过程中试样位移的高采样频率信息进行周期性采集和过滤。蠕变曲线描述了疲劳试验期间平均位移的演变，表明冷流动现象可能引发疲劳破坏，而不是裂纹的扩展。

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Volume 3: Advanced Materials: Design, Processing, Characterization, and Applications

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