目的 研究铝塑膜的性能各向异性，并构建其与各层基材性能关系的数学模型。方法 通过拉伸试验系统研究铝塑膜各层基材的各向异性特征及应力应变行为，采用层状复合材料的混合定律，构建铝塑膜的强度与基材强度的关系模型。结果 聚丙烯膜强度各向异性指数最低为1.5，尼龙膜延伸率各向异性指数最低为−0.8，铝箔的强度和延伸率各向异性指数分别为4.0和−8.7，铝塑膜复合膜的强度和延伸率各向异性指数与铝箔接近，是影响铝塑膜各向异性的关键基材。结论 基于混合定律采用线性回归分析方法构建的铝塑膜应力模型与实际测试结果吻合良好，在工程领域可以用作铝塑膜基材选型的参考。

The work aims to study the performance anisotropy of aluminum-plastic films and construct a mathematical model for strength of films with that of the substrate. The anisotropic characteristics and stress-strain behavior of each layer of aluminum-plastic film substrates were studied by tensile test. Based on the mixing law of laminated composites, the relationship model between the strength of aluminum-plastic films and the strength of substrates was constructed. The results showed that the lowest anisotropy index of strength of polypropylene films was 1.5, the lowest anisotropy index of elongation of nylon films was −0.8, and the anisotropy index of strength and elongation of aluminum foils were 4.0 and −8.7, respectively. Moreover, the anisotropy index of strength and elongation of aluminum-plastic laminated composite films was close to that of aluminum foils, which was the key substrate affecting the anisotropy of aluminum-plastic films. The stress model of aluminum-plastic films constructed based on the mixing law and linear regression analysis method is in good agreement with the actual results, indicating that it can be used as a reference for the selection of aluminum-plastic film substrates in the engineering field.