Models for fiber stress utilization in air jet yarns

Abstract

The coefficient of fiber stress utilization of air jet viscose staple spun yarns was predicted from the experimental specific stress-strain curves of both fiber and yarns. The coefficient of fiber stress utilization was calculated from Gegauff’s model, single integral model (SIM) and double integral model (DIM). Results showed that the single integral model overestimated the coefficient of fiber stress utilization considering actual stress-strain relationship which was not considered by Gegauff’s model. When fiber orientation effect in the air jet yarn was considered in double integral equation, the predicted coefficient of fiber stress utilization was in good agreement with the experimental coefficient of fiber stress utilization before the process of break. Furthermore, the yarn specific stress was also evaluated from the predicted coefficient of fiber stress utilization from double integral model and experimental fiber specific stress-strain curve for all three air jet viscose yarns. The predicted yarn specific stress-strain curves were in good agreement with experimental yarn specific stress-strain curves for all air jet yarns.