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| 1 | Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior显示文摘The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We used therefore start-up experiments with constant shear rates and can speak consequently of shear stress instead of viscosity.The shear stress increases sharply at the beginning of the stress growth experiment,passes an overshoot and begins to decrease up to the steady state shear stress.We can assume that a stress growth curve with an overshoot points out to thixotropic behavior.After the steady state shear stress is reached,the shear deformation is stopped,and the stress relaxation begins.It is to be expected that the shear stress will recover after the stress relaxation.Systems with shear thinning and plastic flow behavior were examined.The thixotropy is discussed in relation to the flow behavior.Stress growth experiments were performed with shear rates from the first Newtonian region and from the shear thinning region of the systems with shear thinning flow behavior.Stress start-up experiments were carrying out with shear rates from the first and second yield stress regions and from the transition section of a system with plastic flow behavior. | Dimiter Hadjistamov | 2019 | 材料科学与工程(中英文B版)2019，9，2： | 1 |
| 2 | Critical Consideration of the Definition of Thixotropy显示文摘Barnes et al.defined thixotropy as“gradual decrease of viscosity under shear followed by a gradual recovery of the structure when the shear rate is removed”.The investigated pigment dispersions,with a gel-sol-gel conversion,show a decrease in viscosity under shear.After the shear rate is removed,a gradual recovery of the structure occurs with the rest time.It was found that the pigment dispersions follow the thixotropy definition.The systems with shear thinning flow behavior show start-up curves with maximum in experiments with shear rates from the shear thinning region,as a characteristic for thixotropy.After cessation of the shear,a gradual recovery of the structure is not observed,or the second part of the thixotropic definition is not fulfilled.The structure of the systems with plastic flow behavior as well does not recover.We presented a new,second,definition of thixotropy for non-gel-sol-gel systems—when a constant shear deformation is applied,the shear stress or viscosity passes through a maximum and then achieves a steady state value.After the shear deformation is stopped,the stress relaxation begins.The shear stress comes to a steady state value—the residual shear stress.The structure does not recover after cessation of the shear flow. | Dimiter Hadjistamov | 2022 | 材料科学与工程(中英文A版)2022，12，3： | 0 |
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