In order to study the influence of service temperature on the fatigue performance of the adhesive structure, Sikaflex®-265 polyurethane adhesive was used to make thick-adherend shear joints (TASJs) with aluminum alloy. According to the service environment of the vehicle, the temperature points of −40 °C, −10 °C, 20 °C, 50 °C and 80 °C were selected to carry out quasi-static tensile test on the joints, and the change law of failure load and failure displacement with time was analyzed. The variation law of the fatigue frequency and load on the internal temperature of the adhesive layer was analyzed by using the environment-fatigue coupling loading device. The fatigue load levels (60%, 50%, 40%, 30% and 20%) were selected to carry out fatigue tests, the fatigue life curves at different temperatures were analyzed, and the functional relationship of nominal stress-temperature-fatigue fracture cycles was obtained by fitting. The fatigue failure section of the joints at different temperature was analyzed by macrography and scanning electron microscopy (SEM). The results show that the temperature has obvious influence on the quasi-static and fatigue performance of the joints. Since the glass transition temperature (T_g) of the adhesive is −66 °C, the quasi-static failure load and failure displacement of the joints gradually decrease with the increase of temperature. Compared with −40 °C, the failure load and failure displacement decrease by 76.88% and 57.36% respectively at 80 °C. The temperature inside the adhesive layer increases with the increase of the fatigue frequency. With the increase of temperature, the fatigue performance of the joint decreases gradually. The closer the temperature is to the T_g of the adhesive, the larger the fatigue performance decreases. The temperature has obvious effect on the fatigue failure section, and the fatigue failure mechanism may change with the change of temperature. Interface failure is easy to occur at low temperature, and the ligament area of the failure section changes significantly. Cohesive failure is easy to occur at high temperature, and the obvious cracks and convex particles are easy to appear on the failure section.

为了研究使用温度对胶粘剂结构疲劳性能的影响，使用Sikaflex®-265聚氨酯胶粘剂与铝合金制成厚粘连剪切接头（TASJs）。根据车辆的使用环境，选择−40°C，-10°C，20°C，50°C和80°C的温度点对接头进行准静态拉伸试验，分析了失效载荷和失效位移随时间的变化规律。利用环境疲劳耦合加载装置，分析了疲劳频率和载荷在胶层内部温度上的变化规律。选择疲劳载荷水平（60％，50％，40％，30％和20％）进行疲劳测试，分析了不同温度下的疲劳寿命曲线，通过拟合得到名义应力-温度-疲劳断裂循环的函数关系。通过宏观和扫描电子显微镜（SEM）分析了不同温度下的接头疲劳破坏截面。结果表明，温度对接头的准静态和疲劳性能有明显的影响。自玻璃化转变温度（T粘合剂的_g）为-66°C时，准静态失效载荷和接头的失效位移随着温度的升高而逐渐减小。与−40°C相比，在80°C下的失效载荷和失效位移分别降低了76.88％和57.36％。粘合剂层内部的温度随着疲劳频率的增加而升高。随着温度的升高，接头的疲劳性能逐渐降低。温度越接近T _g粘合剂的疲劳性能下降越大。温度对疲劳破坏区域有明显的影响，疲劳破坏机理可能随温度的变化而变化。在低温下很容易发生接口故障，并且故障部分的韧带区域会发生很大变化。高温下容易发生内聚破坏，破坏部位容易出现明显的裂纹和凸粒。