蠕变变形中的涨落和标度
Fluctuations and scaling in creep deformation
摘要：
本文用纸样研究了Andrade幂律和对数阶段蠕变中变形的空间波动。数字图像相关技术的测量结果表明，应变率波动的相对强度随时间的增加，在两个蠕变制度。在Andrade蠕变阶段，其特征在于由幂律衰减的应变速率$ε_t \sim t^{-θ}$，与$θ\approx 0.7$，波动服从$Δε_t \sim t^{-γ}$，与$γ\approx 0.5$。局部变形遵循适合于吸收状态/去钉扎过渡的数据塌陷。在晶体塑性模型中也发现了类似的行为，即出现了阻塞或屈服相变。
英文摘要：
The spatial fluctuations of deformation are studied in creep in the Andrade's power-law and the logarithmic phases, using paper samples. Measurements by the Digital Image Correlation technique show that the relative strength of the strain rate fluctuations increases with time, in both creep regimes. In the Andrade creep phase characterized by a power law decay of the strain rate $ε_t \sim t^{-θ}$, with $θ\approx 0.7$, the fluctuations obey $Δε_t \sim t^{-γ}$, with $γ\approx 0.5$. The local deformation follows a data collapse appropriate for an absorbing state/depinning transition. Similar behavior is found in a crystal plasticity model, with a jamming or yielding phase transition.
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