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镀有薄层金属的聚合物在实际生活中大量应用。这类材料在实际应用中受到各种应力的作用。研究金属 聚合物复合体系的力学特性既具有科学意义 ,又具有实际意义。本文利用扫描电子显微镜研究了在拉伸铝 聚对苯二甲酸乙二酯 (Al PET)复合体系条件下涂层铝的破坏规律 ,并提出了铝膜的破坏机理。结果表明 ,在Al PET形变的过程中 ,铝膜发生了规则断裂。铝膜断片的尺寸取决于应变、形变温度、应变速率和铝膜厚度 ,但最基本的影响因素是PET基体中的应力和铝膜厚度。铝膜的规则破坏是由其中的应力分布决定的 :在PET形变过程中 ,铝膜断片中部的应力最大 ,所以裂纹产生于断片中部 ,其结果是铝膜断裂为均等的两部分。理论研究表明 ,铝膜断片的尺寸 (L)与基体中的应力 (σ)和铝膜厚度 (h)之间有如下关系 :L =2hσ0 σ(其中σ0 为铝膜断裂强度 )。
Polymers coated with thin layers of metal are used in large quantities in real life. Such materials in practical applications by a variety of stress. It is of scientific and practical significance to study the mechanical properties of metal-polymer composites. In this paper, the failure mechanism of coating aluminum under tensile aluminum-polyethylene terephthalate (Al PET) composite system was studied by scanning electron microscope, and the destruction mechanism of aluminum film was proposed. The results show that the Al film undergoes regular rupture during Al PET deformation. The size of the aluminum film fragment depends on the strain, deformation temperature, strain rate and aluminum film thickness, but the most fundamental factor is the stress in the PET matrix and the aluminum film thickness. The rupture of the aluminum film is determined by the stress distribution: during the deformation of the PET, the stress in the middle of the aluminum film fragment is the largest, so that cracks are generated in the middle of the fragment, resulting in the fracture of the aluminum film into two equal parts. Theoretical studies have shown that there is a relationship between the size (L) of aluminum film fragments and the stress (σ) in the matrix and the thickness of the aluminum film (h): L = 2hσ0σ (where σ0 is the rupture strength of the aluminum film).