高粘性流动的Eshelby模型
An Eshelby model for the highly viscous flow
摘要：
分子玻璃形成者中的剪切流和介电α过程是根据局部结构重排来建模的，这些重排可以逆转强局部剪切。利用相应弹性理论问题的Eshelby解（J.D. Eshelby，Proc. Roy. Soc.A241，376（1957）），可以计算可恢复柔量并估计表征这种结构重排的对称双阱势的寿命。一个完整的建模的剪切松弛谱需要一个额外的参数化的这些结构重排的势垒密度。介电弛豫谱可以描述为这些弛豫与德拜过程的折叠。
英文摘要：
The shear flow and the dielectric alpha-process in molecular glass formers is modeled in terms of local structural rearrangements which reverse a strong local shear. Using Eshelby's solution of the corresponding elasticity theory problem (J. D. Eshelby, Proc. Roy. Soc. A241, 376 (1957)), one can calculate the recoverable compliance and estimate the lifetime of the symmetric double-well potential characterizing such a structural rearrangement. A full modeling of the shear relaxation spectra requires an additional parametrization of the barrier density of these structural rearrangements. The dielectric relaxation spectrum can be described as a folding of these relaxations with the Debye process.
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