The transient behavior of soft glassy materials far from equilibrium
The transient behavior of soft glassy materials far from equilibrium
复制标题
软玻璃材料远离平衡的瞬态行为
作者：
Jun Dong Park;S. Rogers
研究了非平衡软质玻璃材料在小、中、大振幅振荡剪切作用下的瞬态结构和流变行为，并通过全定量物理过程序列（SPP）技术进行了解释。我们确定了引起特定流变响应的局部应变分布特征，并表明SPP指标准确地反映了结构转变。SPP模量反映了多少施加的应变以可恢复弹性应变的形式存储，将其建立为结构弹性的精确测量。我们证明了SPP方案的能力，以准确地确定在弹性占主导地位的情况下获得的可恢复应变量，通过匹配仅根据宏观应力与结构措施估计的值。在大振幅振荡剪切的一种情况下，通过结构测定和SPP分析显示，可恢复应变约为无量纲应变单位的一半，而在相同区间内的总施加应变约为十个应变单位。因此，我们证明了在应变控制条件下分离总应变和可恢复应变对于形成准确的结构-性质关系的重要性。我们证明了交替振荡状态如何被认为是一个复杂剪切历史的结果。这项研究的结果表明，SPP方案是一个强大的工具，研究人员希望了解软玻璃材料的结构和流变性能远离平衡。研究了非平衡软质玻璃材料在小、中、大振幅振荡剪切作用下的瞬态结构和流变行为，并通过全定量物理过程序列（SPP）技术进行了解释。我们确定了引起特定流变响应的局部应变分布特征，并表明SPP指标准确地反映了结构转变。SPP模量反映了多少施加的应变以可恢复弹性应变的形式存储，将其建立为结构弹性的精确测量。我们证明了SPP方案的能力，以准确地确定在弹性占主导地位的情况下获得的可恢复应变量，通过匹配仅根据宏观应力与结构措施估计的值。在一种大振幅振荡剪切情况下，通过结构测定表明，可恢复应变约为无量纲应变单位的一半。
The transient structural and rheological behavior of soft glassy materials out of equilibrium is studied under small, medium, and large amplitude oscillatory shearing and interpreted via the fully quantitative sequence of physical processes (SPP) technique. We identify features of the local strain distribution that cause particular rheological responses and show that the SPP metrics accurately reflect the structural transitions. The SPP modulus is shown to reflect how much of the imposed strain is stored in the form of recoverable elastic strain, establishing it as an accurate measure of structural elasticity. We demonstrate the ability of the SPP scheme to accurately determine the amount of recoverable strain acquired in elastically dominated regimes by matching values estimated solely on the basis of the macroscopic stress to structural measures. In one case of large amplitude oscillatory shearing, the recoverable strain is shown to be around half a nondimensional strain unit by structural determination and from the SPP analysis, while the total imposed strain over the same interval is on the order of ten strain units. We therefore demonstrate the importance of separating the total and recoverable strains under strain-controlled conditions for the formation of accurate structure-property relations. We demonstrate how the alternating oscillatory state may be considered a consequence of a complex shear history. The results of this study show that the SPP scheme is a powerful tool for researchers wishing to understand the structural and rheological properties of soft glassy materials far from equilibrium.The transient structural and rheological behavior of soft glassy materials out of equilibrium is studied under small, medium, and large amplitude oscillatory shearing and interpreted via the fully quantitative sequence of physical processes (SPP) technique. We identify features of the local strain distribution that cause particular rheological responses and show that the SPP metrics accurately reflect the structural transitions. The SPP modulus is shown to reflect how much of the imposed strain is stored in the form of recoverable elastic strain, establishing it as an accurate measure of structural elasticity. We demonstrate the ability of the SPP scheme to accurately determine the amount of recoverable strain acquired in elastically dominated regimes by matching values estimated solely on the basis of the macroscopic stress to structural measures. In one case of large amplitude oscillatory shearing, the recoverable strain is shown to be around half a nondimensional strain unit by structural determination...