The yarn specific work of rupture is a comprehensive index to characterize the resistance of yarn to mechanical destruction. For blended yarn, it is closely related to the blended ratio of the components. This paper established a model to express the quantitative relationship between the specific work of rupture and the blended ratio in blended yarn. This model was obtained by analyzing the breaking process of blended yarn and summarizing the empirical data. Then, the experimental data were used to verify the established model and a good agreement between the calculated and experimental results was found. According to this model, the curve of the specific work of rupture against the blended ratio can be obtained by simple plotting. Consequently, this work can be used to predict the specific work of rupture for blended yarn with various blended ratios.
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