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首页> 外文期刊>Geochemistry, geophysics, geosystems >Strain localization in polycrystalline material with second phase particles: Numerical modeling with application to ice mixtures
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Strain localization in polycrystalline material with second phase particles: Numerical modeling with application to ice mixtures

机译：具有第二相颗粒的多晶材料中的应变局部化：数值模拟及其在冰混合物中的应用

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摘要

We use a centimeter-scale 2-D numerical model to investigate the effect of the presence of a second phase with various volume percent, shape, and orientation on strain localization in a viscoelastic matrix. In addition, the evolution of bulk rheological behavior of aggregates during uniaxial compression is analyzed. The rheological effect of dynamic recrystallization processes in the matrix is reproduced by viscous strain softening. We show that the presence of hard particles strengthens the aggregate, but also causes strain localization and the formation of ductile shear zones in the matrix. The presence of soft particles weakens the aggregate, while strain localizes within the particles and matrix between particles. The shape and the orientation of second phases control the orientation, geometry, and connectivity of ductile shear zones. We propose an analytical scaling method that translates the bulk stress measurements of our 2-D simulations to 3-D experiments. Comparing our model to the laboratory uniaxial compression experiments on ice cylinders with hard second phases allows the analysis of transient and steady-state strain distribution in ice matrix, and strain partitioning between ice and second phases through empirical calibration of viscous softening parameters. We find that the ice matrix in two-phase aggregates accommodates more strain than the applied bulk strain, while at faster strain rates some of the load is transferred into hard particles. Our study illustrates that dynamic recrystallization processes in the matrix are markedly influenced by the presence of a second phase.
机译：我们使用厘米尺度的二维数值模型来研究具有不同体积百分比，形状和取向的第二相的存在对粘弹性基质中应变局部化的影响。此外，分析了单轴压缩过程中聚集体整体流变行为的演变。基质中动态再结晶过程的流变效应通过粘性应变软化得以再现。我们表明，硬质颗粒的存在增强了聚集体，但也导致了应变局部化和基体中韧性剪切区的形成。软颗粒的存在会削弱聚集体，而应变则位于颗粒内部以及颗粒之间的基质中。第二相的形状和方向控制韧性剪切区的方向，几何形状和连通性。我们提出了一种解析缩放方法，可以将我们的2D模拟的整体应力测量结果转换为3D实验。将我们的模型与具有坚硬第二相的冰缸的实验室单轴压缩实验进行比较，可以分析冰基质中的瞬态和稳态应变分布，并通过经验性校准粘性软化参数来分析冰相和第二相之间的应变分配。我们发现，两相聚集体中的冰基质所承受的应变要大于所施加的整体应变，而在更快的应变速率下，一些负荷会转移到硬颗粒中。我们的研究表明，基质中的动态重结晶过程受到第二相的显着影响。

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