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摘要:自20世纪70年代以来, 类固体非晶态材料变形与失效的理论模型相继出现, 这些模型基于应力驱动分子重排从而在局部流动缺陷处发生剪切转变这一物理图像. 该图像是现代剪切转变区理论的基础, 也是本综述的焦点. 我们将首先概述该理论框架并给出一些应用案例, 特别是块体金属玻璃应力−应变测量结果的阐释, 剪切带数值模拟分析和剪切转变区运动方程在自由边界计算中的应用. 在本综述的第二部分, 为简单起见, 将关注非晶塑性的非热模型, 并基于该模型说明剪切转变区理论是如何从非平衡热力学的系统描述中发展起来的.Abstract:Since the 1970s, theories of deformation and failure of amorphous, solidlike materials have started with models in which stress-driven, molecular rearrangements occur at localized flow defects via shear transformations. This picture is the basis for the modern theory of shear transformation zones (STZs), which is the focus of this review. We begin by describing the structure of the theory in general terms and by showing several applications, specifically, interpretation of stress-strain measurements for a bulk metallic glass, analysis of numerical simulations of shear banding, and the use of the STZ equations of motion in free-boundary calculations. In the second half of this review, we focus for simplicity on what we call an athermal model of amorphous plasticity, and use that model to illustrate how the STZ theory emerges within a systematic formulation of nonequilibrium thermodynamics.
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图 1Vitreloy 1金属玻璃在643 K下, 不同应变率对应的应力−应变理论预测曲线. 这些曲线可以与Lu等(2003)的实验结果很好吻合. 最上面的曲线是个例外, 此曲线在峰值应力处没有对应的实验数据点, 这大概是因为样品在此时已发生破坏
图 2Vitreloy 1拉伸应力关于约化应变率
$2{\eta _N}\dot \gamma $ 的函数曲线, 其中${\eta _N}$ 是牛顿粘度. 标注温度的数据点来自Lu等(2003). 三条灰色的曲线, 从下到上, 分别对应于T= 573 K, 643 K和683 K的理论预测结果
图 3(a) 模拟应变率的100%总应变平均值, 在不同应变下关于位置的函数曲线. 深灰色虚线是施加的平均应变率. (b) 剪切转变区理论预测对应于图a中的模拟数据. (c) 在与(a)相同的总应变下, 模拟平均势能(任意单位)随位置的变化. (d) 剪切转变区预测的有效温度(以剪切转变区形成能
${e_{\rm{Z}}}$ 为单位)随位置的变化趋势. (c)和(d)中的深灰色长虚线给出了势能和有效温度初始值
图 4Rycroft & Gibou (2012)通过求解有关剪切转变区塑性的弹塑性运动方程得到的颈缩失稳的演化形貌. 相比蓝色区域, 红色区域有效温度更高, 即它们具有更高的有效无序温度, 因此经历了更多的不可逆塑性变形
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