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arXiv 1601.02196cond-mat.softcond-mat.mtrl-sci
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非晶态固体的机械屈服:一级相变

Mechanical Yield in Amorphous Solids: a First-Order Phase Transition

Prabhat Jaiswal, Itamar Procaccia, Corrado Rainone, Murari Singh

摘要:

非晶态固体在应变的临界值下屈服(在应变控制实验中);对于较大的应变,平均应力不再增加-系统显示弹塑性稳定状态。材料界长期存在的一个谜是材料屈服前后的微观状态有什么不同。文献中的解释是具体的,但这一现象的普遍性需要一个普遍的答案。我们在这里认为,有没有根本的区别,在物质的状态之前和之后的产量,但产量是一个真正的一阶相变之间的一个高度限制的一组可能的配置居住在一个小区域的相空间,一个非常丰富的配置,其中包括许多边缘稳定的。为了证明这一点,我们采用了一个序参量的普遍适用性,独立的微观相互作用,这是成功的量化过渡在一个明确的方式。

英文摘要:

Amorphous solids yield at a critical value of the strain (in strain controlled experiments); for larger strains the average stress can no longer increase - the system displays an elasto-plastic steady state. A long standing riddle in the materials community is what is the difference between the microscopic states of the material before and after yield. Explanations in the literature are material specific, but the universality of the phenomenon begs a universal answer. We argue here that there is no fundamental difference in the states of matter before and after yield, but the yield is a bona-fide first order phase transition between a highly restricted set of possible configurations residing in a small region of phase space to a vastly rich set of configurations which include many marginally stable ones. To show this we employ an order parameter of universal applicability, independent of the microscopic interactions, that is successful in quantifying the transition in an unambiguous manner.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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