摘要
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 with a thin metallic coating are widely used in our lives, and they are often used under the influence of various stresses. It is important to study mechanical properties of metal/polymer composite. In this paper, the breaking rule of Al-coating in tension of Al/PET composite is studied by SEM, and the breaking mechanism of Al/PET is advanced. The result shows that Al-coating broke regularly in procession of Al/PET deformation. The dimension of Al-coating fragments is determined by temperature, strain, strain rate and thickness of the Al-coating, but the most critical factors of them are stress in PET matrix and thickness of Al-coating. The regular breakdown of Al-coating is determined by stress distribution: the cracking is created in center of Al-coating fragment in which the stress is the largest. As a result, the Al-coating fragment breaks into two identical parts. The theoretical research shows that the relationship between the dimension of Al-coating fragments (L) and the thickness of Al-coating (h) is: L=2hσ 0/σ, where,σ 0 means tensile breaking strength of Al-coating.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2004年第5期709-712,共4页
Journal of Materials Science and Engineering
基金
俄罗斯基础研究基金资助项目 (批准号 :0 0 0 3 81 2 0 1 )
