Abstract:

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 universal test 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.

Key words: cotton fiber assembly, compressive force, transmission, relative density