Zhi Chao, Du Mingjuan, Sun Zhaoling, Wu Mengjie, He Xiaoyi, Meng Jiaguang, Yu Lingjie
School of Textile science and engineering, Xi'an Polytechnic University, Xi'an 710048, China.
Polymers (Basel). 2020 Feb 1;12(2):286. doi: 10.3390/polym12020286.
In this study, a new type ternary composite, called warp-knitted spacer fabric reinforced syntactic foam (WKSF-SF), with the advantages of high mechanical properties and a lower density, was proposed. Then, a meso-mechanics theoretical model based on the Eshelby-Mori-Tanaka equivalent inclusion method, average stress method and composite hybrid theory was established to predict the compression modulus of WKSF-SF. In order to verify the validity of this model, compression modulus values of theoretical simulations were compared with the quasi-static compression experiment results. The results showed that the addition of suitable WKSF produces at least 15% improvement in the compressive modulus of WKSF-SF compared with neat syntactic foam (NSF). Meanwhile, the theoretical model can effectively simulate the values and variation tendency of the compression modulus for different WKSF-SF samples, and is especially suitable for the samples with smaller wall thickness or a moderate volume fraction of microballoons (the deviations is less than 5%). The study of the meso-mechanical properties of WKSF-SF will help to increase understanding of the compression properties of this new type composite deeply. It is expected that WKSF-SF can be used in aerospace, marine, transportation, construction, and other fields.
在本研究中，提出了一种新型三元复合材料，称为经编间隔织物增强复合泡沫材料（WKSF-SF），它具有高力学性能和低密度的优点。然后，基于埃舍尔比-森-田中等效夹杂法、平均应力法和复合材料混合理论建立了细观力学理论模型，以预测WKSF-SF的压缩模量。为验证该模型的有效性，将理论模拟的压缩模量值与准静态压缩实验结果进行了比较。结果表明，与纯复合泡沫材料（NSF）相比，添加合适的WKSF可使WKSF-SF的压缩模量提高至少15%。同时，该理论模型能够有效模拟不同WKSF-SF样品压缩模量的值及变化趋势，尤其适用于壁厚较小或微球体积分数适中的样品（偏差小于5%）。对WKSF-SF细观力学性能的研究将有助于深入了解这种新型复合材料的压缩性能。预计WKSF-SF可应用于航空航天、海洋、交通、建筑等领域。
