摘要翻译:
根据对非平衡状态下有效无序、温度和熵流作用的认识,对玻璃形成材料塑性变形的剪切相变区(STZ)理论进行了重新表述。快速和缓慢内部状态变量之间的区别将理论简化为两个耦合的运动方程,一个描述对施加应力的塑性响应,另一个描述有效温度的动力学。导出这些方程的分析,作为一个副产品,包含了对非晶材料中动态屈服应力的基本重新解释。为了将所有这些概念结合在一个现实的背景下,本文最后对实验观察到的大块金属玻璃的流变行为进行了重新审查。这次复查是对STZ动力学的一次检验,证实了从稳态特性(如粘度)中获得的系统参数可以用来预测瞬态行为。
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英文标题:
《Shear-transformation-zone theory of plastic deformation near the glass
transition》
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作者:
J.S. Langer
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Materials Science 材料科学
分类描述:Techniques, synthesis, characterization, structure. Structural phase transitions, mechanical properties, phonons. Defects, adsorbates, interfaces
技术,合成,表征,结构。结构相变,力学性质,声子。缺陷,吸附质,界面
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一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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英文摘要:
The shear-transformation-zone (STZ) theory of plastic deformation in glass-forming materials is reformulated in light of recent progress in understanding the roles played the effective disorder temperature and entropy flow in nonequilibrium situations. A distinction between fast and slow internal state variables reduces the theory to just two coupled equations of motion, one describing the plastic response to applied stresses, and the other the dynamics of the effective temperature. The analysis leading to these equations contains, as a byproduct, a fundamental reinterpretation of the dynamic yield stress in amorphous materials. In order to put all these concepts together in a realistic context, the paper concludes with a reexamination of the experimentally observed rheological behavior of a bulk metallic glass. That reexamination serves as a test of the STZ dynamics, confirming that system parameters obtained from steady-state properties such as the viscosity can be used to predict transient behaviors.
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PDF链接:
https://arxiv.org/pdf/712.0399