具有负泊松比效应经编织物的制备及其力学性能

Manufacture and mechanical properties of negative Poisson's ratio warp knitted fabrics

负泊松比效应材料结构具有优良与独特的力学性能,而针织结构是制备负泊松比效应材料的最佳结构之一,为此,对经编机上生产负泊松比效应织物的组织结构和力学性能进行了研究。首先,对负泊松比效应织物的结构进行设计,确定其编织工艺,并在KS4特里科经编机上进行上机编织操作;然后,对织物分别从0°、45°、90°和135°方向进行拉伸性能试验,通过绘制不同方向的应力与应变曲线及泊松比与应变曲线研究其力学性能,同时分析了几种织物不同方向上拉伸的最终破坏形态。结果表明,不同织物在不同方向上存在力学性能差异。

Negative Poisson＇s ratio（ NPR） materials have excellent and unique mechanical properties.Knitting structure is one of the best structures to make the NPR materials. In this paper,the structures and mechanical properties of NPR fabrics produced in warp knitting machines were studied. First of all,the structure of NPR fabric was designed,their weaving processes were determined,and knitting is performed on a KS4 Tricot knitting machine. Then, the tensile properties testing of fabrics were performed in the directions of 0°,45°,90° and 135°,and by stretching a stress-strain curve in different directions and a Poisson＇s ratio-strain curve,the mechanical properties of the fabrics were studied,and the final destruction morphologies of several kinds of fabrics stretched in different directions were analyzed,and the results show that differences in mechanical properties exist between different fabrics and in directions.