经编间隔织物增强聚氨酯基复合材料的压缩模型

Compression Model of Polyurethane-Based Composites Reinforced with Warp-Knitted Spacer Fabrics

通过将经编间隔织物与软质聚氨酯泡沫复合,制备出一种经编间隔织物增强聚氨酯基复合材料。在忽略材料面板对复合材料整体力学作用的前提下,着重对间隔丝的空间分布及受力情况进行分析,建立了基于文克尔弹性地基梁理论的复合材料压缩理论模型,进而得到理论压缩应力-应变曲线,并将其与试验得到的压缩应力-应变曲线进行对比,结果显示两者之间具有较高的吻合度。这说明本文所建立的压缩模型能较好地模拟经编间隔织物增强聚氨酯基复合材料实际的受力情况,可为实际工程应用提供理论指导。

The polyurethane-matrix composite samples were prepared by impregnating the warp-knitted spacer fabrics with flexible polyurethane foam. On the premise of ignoring the effect of material＇s panel on the overall mechanics of composite materials,the distribution of spacer yarns and its stress were analyzed. Based on the Winkle elastic foundation theory, a compression analysis model of composites was established. The compression stress-strain curves obtained from the theoretical model were compared to the experimental results. The results show that the theoretical model is in good agreement with the experimental data,indicating that the predicted model can successfully simulate the compression behaviors of polyurethane-based composites reinforced with warp-knitted spacer fabric and offer references for designing and producing the composites for cushioning applications.