Tensile behavior of staple fiber yarns part I: theoretical models

Abstract In this work, an attempt is made to create theoretical models on tensile behavior of staple fiber yarns and verify them with experimental results. While the first part of this work deals with model development, the second part reports on model validation. This part starts with a description of stress–strain diagrams of fiber and yarn. It then discusses the tensile behavior of twisted yarns according to helical model. Afterward, it proceeds to partial generalization of helical model by taking into account of the influence of fiber orientation distribution on fiber stress utilization in yarn. At the end, it provides a theoretical example for better illustration of the models. In the second part of this work, we report on comparison of the models with experimental results.