【作者】 杨凯； 俞炜；

【Author】 KAI YANG;WEI Yu;Advanced Rheology Institute, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University;Malvern Instruments (China);

【机构】 上海交通大学化学化工学院流变学研究所； 英国马尔文仪器公司；

【摘要】 大振幅振荡剪切（LAOS）是表征和研究屈服应力流体屈服应力和液固转变过程的重要方法,但是由于屈服转变过程中复杂的非线性粘弹性,通过LAOS确定的屈服应力和瞬态应力扫描确定的屈服应力存在一定的差别^[1]。本文通过对应力-应变速率的Lissajaous曲线进行分析,提出一种新的确定屈服应力方法,发现该方法确定的屈服应力与瞬态应力扫描方法具有一致性。更多还原

【Abstract】 Large amplitude oscillation shear(LAOS) is an important method to investigate the yielding and flow behavior of yield stress fluids. However, the yield stress determined by LAOS are difficult and sometimes contradictory compared with most common method shear stress ramp measurement. This paper proposed a new method to determine the yield stress based on the analysis of stress-mean strain rate plot and we proved that this method can obtain a consistent yield stress with the shear stress ramp measurement.更多还原