Karmakar Smarajit, Lerner Edan, Procaccia Itamar
Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
Phys Rev E Stat Nonlin Soft Matter Phys. 2010 Aug;82(2 Pt 2):026104. doi: 10.1103/PhysRevE.82.026104. Epub 2010 Aug 10.
Amorphous solids that underwent a strain in one direction such that they responded in a plastic manner "remember" that direction also when relaxed back to a state with zero mean stress. We address the question "what is the order parameter that is responsible for this memory?" and is therefore the reason for the different subsequent responses of the material to strains in different directions. We identify such an order parameter which is readily measurable, we discuss its trajectory along the stress-strain curve, and propose that it and its probability distribution function must form a necessary component of a theory of elastoplasticity.
在一个方向上发生应变从而以塑性方式响应的非晶态固体，当松弛回到平均应力为零的状态时，也“记住”那个方向。我们探讨“负责这种记忆的序参量是什么？”这一问题，它也是材料对不同方向应变后续响应不同的原因。我们确定了这样一个易于测量的序参量，讨论了它在应力 - 应变曲线上的轨迹，并提出它及其概率分布函数必定构成弹塑性理论的一个必要组成部分。
