目的 EPE作为缓冲包装材料，在长期储运过程中易受环境影响发生老化，增加产品受损风险，且其寿命测试周期较长，难以快速预测。为了快速评估EPE材料的老化性能，开展温度/紫外辐照双因素耦合加速老化试验并构建数学模型。方法 以压缩永久变形率为老化指标，基于时温叠加原理得到老化时间-压缩永久变形率曲线的位移加速因子，采用插值法推算日常环境(20 ℃、0.029 W/m²)下材料老化加速因子，构建快速预测EPE材料老化时间的耦合加速因子模型。结果 结果表明，温度越高、辐照度越大，材料老化现象(黄化、卷翘、开裂)越显著，材料降解越严重，力学性能越差。数据显示，在不同温度(40、50、60、70 ℃)和辐照度(0.45、0.86、1.18、1.49 W/m²)下，老化时间-压缩永久变形率曲线均呈典型的对数趋势，20 ℃、0.029 W/m²下模型预测和实际失效时间分别为1.17和1.25年，相对误差为0.064，试验周期与温度单因素加速老化测试时间加速比为3.13~6.25倍。结论 基于时温叠加原理构建的耦合老化加速因子模型可以快速准确预测材料的老化时间，为EPE等同类材料的实际应用提供理论指导。

As a cushioning packaging material, EPE is prone to aging due to environmental influences during long-term storage and transportation, increasing the risk of product damage. Moreover, its lifespan testing cycle is relatively long, making it difficult to predict aging quickly. The work aims to conduct a temperature/ultraviolet irradiation dual-factor coupled accelerated aging test and establish a mathematical model to rapidly assess the aging performance of EPE materials. With the compression set rate as the aging index, the displacement acceleration factor of the aging time-compression set rate curve was obtained based on the time-temperature superposition principle. The aging acceleration factor under daily environmental conditions (20 ℃, 0.029 W/m2) was calculated using interpolation, and a coupled acceleration factor model for rapid prediction of EPE material aging time was constructed. The results showed that the higher the temperature and the greater the irradiance, the more significant the aging phenomena (yellowing, curling, cracking) of the material, the more severe the material degradation, and the poorer the mechanical properties. The data indicated that under the different temperature (40, 50, 60, 70 ℃) and irradiance (0.45, 0.86, 1.18, 1.49 W/m2), the aging time-compression set rate curves all presented a typical logarithmic trend. The predicted and actual failure time at 20 ℃ and 0.029 W/m2 were 1.17 and 1.25 years, respectively, with a relative error of 0.064. The test period was 3.13 to 6.25 times shorter than that of the single-factor accelerated aging test at a constant temperature. In conclusion, the coupled aging acceleration factor model based on the time-temperature superposition principle can accurately and rapidly predict the aging time of materials, providing theoretical guidance for the practical application of EPE and similar materials.