棉纤维集合体压缩力传递与密度关系

为分析棉纤维集合体的压缩力传递特性，在万能试验机上对棉纤维集合体进行压缩试验，用压力传感系统采集受压棉纤维集合体上、中、下3 层的压强，分析传感器采集的压缩强度与棉纤维集合体应变、相对密度的关系。试验结果表明：随着棉纤维集合体应变的增加，其各层压强值均增加； 各层棉纤维集合体压强值由上而下呈降低趋势，层间存在显著压强差。分析棉纤维集合体的密度力学性能发现，其相对密度与压强之间呈极佳的线性关系，即棉随着纤维集合体相对密度的增加，各层压强均呈线性增加。同时，相对密度与层间压强差之间存在良好的关系，表明棉纤维集合体存在显著的应变率敏感性。

Research on compressive force transmission properties and densities-mechanical properties model of cotton fiber assembly

In order to analyze compressive force transmission properties of the cotton fiber assembly,the comperssion test of cotton fiber assembly was carried out in the universaltest of machine, pressure was acquired in the pressure sensing system form the upper, middle and lower cotton layer. This paper analyzed the relationship between pressure and strain, and relative density of cotton fiber saaembly.The results show that various cotton layers of pressure increases with increasing strain of cotton fiber assembly during compressing process. And various cotton layers of pressure become lower in turn from top to bottom, the interlayer pressure showed obvious differences. By subsequent analysis on the cotton fiber assembly density with mechanics, it was found that the relation between relative density and presuure could be expressed in best linearity. Namely, various cotton layers of pressure was in the linear increasing in the compression process with relative density increasing. The R-square of regression function between relative density and presuure difference of various cotton layers of pressure for testing sample was close to 1. It is showed that cotton fiber assembly has significant strain-rate sensitivity.