文献类型：期刊文献

英文题名：Tensile behaviors of nanoporous phenolic composites reinforced by 3D needle-punched preforms with different weave patterns

作者：Cai, Hongxiang[1];Qian, Zhen[1];Li, Liang[1];Zhang, Yayun[1];Niu, Bo[1,2];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Mat & Related Technol, Shanghai 200237, Peoples R China

年份：2023

卷号：43

外文期刊名：COMPOSITES COMMUNICATIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001067766200001)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 52102098 and 22078100) .

语种：英文

外文关键词：Needle-punched preform; Woven fabrics; Micro-CT technology; Finite element analysis

摘要：Needle-punched preform reinforced nanoporous phenolic composite (NPC) is a cost-effective lightweight ablative material for thermal protection systems. It consists of a needle-punched preform composed of alternating stacked fiber felt and stacked woven fabric, which plays a crucial role in the thermal insulation efficiency and mechanical properties. Herein, needle-punched preforms with different types of fabrics, including plain, twill, and satin, are deliberately designed for the reinforcement of NPC, and their tensile properties and fracture mechanism are investigated through experimentation and the CT image-based finite element method. At the same preform density, the composite with plain fabric exhibits the highest tensile strength of 146 & PLUSMN; 6.3 MPa, a tensile modulus of 8.2 & PLUSMN; 0.2 GPa, and an elongation of 2.1 & PLUSMN; 0.1%, due to having the highest number of crossover points and the largest undulation of fiber yarns. Furthermore, the CT image-based simulation reveals the failure mechanism of NPC. The von mises stress of woven fabric is higher than that of fiber felt, which demonstrates the woven fabric is the main load-bearing structure and determines the mechanical of composite. These results will provide useful guidance for the structural design and optimization of needle-punched preform reinforced composites.