Fatigue tests were conducted on scarf adhesive joints (SAJs) with composite substrates at room temperature (RT) and 50 °C. The adhesive layer was modified with Al₂O₃-nanoparticles. Dynamic parameters such as damping factor, storage modulus, dissipated energy and potential energy (U_p) were measured from the stress–strain hysteresis loops of the SAJs with the aim of knowing which ones are best for early prediction of joint collapse. Incorporation of Al₂O₃-nanoparticles into the adhesive layer improves the fatigue strength by about 4.8 and 24.5% at RT and 50 °C respectively. The glass transition temperature was improved by 8.3% and thus, at 50 °C the fatigue strength of the Al₂O₃-SAJs was decreased by 5.4% in return of 20.3% for the NE-SAJs. The variation of the U_p with fatigue life is more pronounced compared to the other dynamic parameters and thus, can be modeled to monitor the integrity of the joint and preventing their catastrophic failure.

在室温（RT）和50°C下，对具有复合材料基材的围巾胶接点（SAJ）进行了疲劳测试。粘合剂层用Al ₂ O ₃纳米颗粒改性。从SAJ的应力-应变磁滞回线中测量了诸如阻尼系数，储能模量，耗散能量和势能（U _p）等动态参数，目的是了解哪种参数最适合早期预测关节塌陷。将Al ₂ O _3-纳米颗粒掺入到粘合剂层中在RT和50℃下分别将疲劳强度提高了约4.8和24.5％。玻璃化转变温度提高了8.3％，因此在50°C时Al ₂的疲劳强度O ₃ -SAJ减少了5.4％，而NE-SAJ减少了20.3％。与其他动态参数相比，U _p随疲劳寿命的变化更加明显，因此可以建模以监控关节的完整性并防止其灾难性故障。