The self-heating-induced temperature rise in the adhesive layer under fatigue loading plays a significant role in influencing the fatigue behavior of riveted-bonded hybrid joints in aluminum-carbon fiber reinforced polymer composite structures. This study aims to investigate the impact of the self-heating effect on the fatigue life of such hybrid joints. Experimental analysis was conducted to explore the interrelationships between temperature evolution and fatigue behavior at varying frequencies, adhesive thicknesses, and loading levels. Additionally, a theoretical model for predicting self-heating temperature rise in hybrid joints with different parameters was developed. Results show that the self-heating effect is notably affected by loading frequency, loading level, and adhesive thickness. The theoretical model accurately captures temperature variations and predicts critical frequencies for hybrid joints under different loading levels, which are identified as 10, 8, 3, and 1 Hz for loading levels of 35%, 40%, 50%, and 60%, respectively. Critical adhesive thicknesses ranging from 0.5 to 1 mm were also determined. Furthermore, the study predicts the fatigue life at specific self-heating temperatures with an average error within 4%, offering valuable theoretical insights for evaluating the fatigue safety performance of hybrid joints and facilitating optimization strategies.

中文翻译：

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自热效应对铝-CFRP铆接混合接头疲劳行为影响的实验研究

疲劳载荷下粘合层自热引起的温升对铝-碳纤维增强聚合物复合材料结构铆接混合接头的疲劳行为具有重要影响。本研究旨在研究自热效应对此类混合接头疲劳寿命的影响。进行实验分析以探索不同频率、粘合剂厚度和负载水平下温度演变和疲劳行为之间的相互关系。此外，还开发了一个预测不同参数混合接头自热温升的理论模型。结果表明，自热效应显着受加载频率、加载水平和粘合剂厚度的影响。理论模型准确捕捉温度变化并预测不同载荷水平下混合接头的临界频率，分别确定载荷水平为 35%、40%、50% 和 60% 时的 10、8、3 和 1 Hz 。还确定了 0.5 至 1 毫米范围内的临界粘合剂厚度。此外，该研究预测了特定自热温度下的疲劳寿命，平均误差在4%以内，为评估混合接头的疲劳安全性能和促进优化策略提供了宝贵的理论见解。