点击次数：

论文类型：期刊论文

发表时间：2017-04-12

发表刊物：COMPOSITES SCIENCE AND TECHNOLOGY

收录刊物：SCIE、EI

卷号：142

页面范围：79-90

ISSN号：0266-3538

关键字：Biomimetic sandwich structure; Hybrid core; Topological optimization; Fractal distribution

摘要：Porous-core sandwich structures with CFRP face sheets have similar micro structures to biological tissues, for example, grass leaves. The sandwich structures are composed of two thin, stiff face sheets, which provide the primary in-plane structural stiffness, and a thick low-density porous core, which provides the functionalities and the majority of out-plane stiffness. However, the mechanical properties of these sandwich structures are often limited by local failures such as face-core debonding or core collapse. Inspired by the tree leaves with fractal distributed veins, which are larger and stiffer than grass leaves, in this paper, a topological optimization on the micro structures of core is conducted to achieve exceptional mechanical properties. By taking adhesive-area constraint, local-buckling constraint and embedding-volume constraint into consideration, a biomimetic hybrid core, which is similar to the fractal distribution of tree veins, is found to be an optimal core design for sandwich structures with CFRP face sheets. (C) 2017 Elsevier Ltd. All rights reserved.