Shear localization in ice: Mechanical response and microstructural evolution of P-faulting
Shear localization in ice: Mechanical response and microstructural evolution of P-faulting
复制标题
DOI：
10.1016/j.actamat.2012.02.051
复制
发表时间：
2012-05
期刊：
影响因子：
9.4
通讯作者：
N. Golding;E. Schulson;C. Renshaw
中科院分区：
文献类型：
--
作者：
N. Golding;E. Schulson;C. Renshaw
对实验室生长的多晶颗粒冰和柱状S2冰在T=−10°C至T=−40°C、应变速率ε tec 11=1×10-5s-1至ε tec 11=2×10- 1 s-1的高度约束条件下进行三轴加载的系统实验显示了导致最终失效的力学响应和微观结构演变。终端故障的特点是一个突然的脆性样的负荷下降，局部加热和发展的窄剪切带，再结晶晶粒组成，在最大剪切平面上取向。这种破坏模式，称为塑性（P）断层，是一致的绝热加热导致局部机械不稳定性和剪切变形的想法。材料的微观结构状态，包括动态再结晶的发展和任何先前的加载历史，不会对剪切局部化的特征或产生P-断层所需的变形水平产生显著影响。
Systematic experiments on laboratory-grown polycrystalline granular ice and columnar S2 ice loaded triaxially under a high degree of confinement at T=−10°C to T=−40°C at applied strain rates ε˙11=1×10-5s-1to ε˙11=2×10-1s-1show the mechanical response and microstructural evolution leading to terminal failure. Terminal failure is characterized by a sudden brittle-like drop in load, localized heating and the development of a narrow shear band, consisting of recrystallized grains, oriented on a plane of maximum shear. This mode of failure, termed plastic (P) faulting, is consistent with the idea of adiabatic heating leading to localized mechanical instability and shear deformation. The microstructural state of the material, including the development of dynamic recrystallization and any prior loading history, does not have a significant affect on the character of shear localization or the levels of deformation required to generate P-faulting.