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arXiv 0711.2004cond-mat.mtrl-scicond-mat.stat-mech
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应力驱动相变与固-固界面粗糙化

Stress-driven phase transformation and the roughening of solid-solid interfaces

L. Angheluta, E. Jettestuen, J. Mathiesen, F. Renard, B. Jamtveit

摘要:

应力对多相固液体系的作用常常导致形态不稳定。在这里,我们提出了一个固-固相变模型粗糙不稳定性的两个多孔材料之间的界面具有不同的孔隙率在正常的压缩应力。这种不稳定性是由界面上自由能量密度的有限跳跃触发的,它导致形成与压实主方向一致的指状结构。该模型被提出作为一个解释粗糙化的stylelae-不规则的接口与压实的沉积岩,波动的平面垂直于压实的主要方向。

英文摘要:

The application of stress to multiphase solid-liquid systems often results in morphological instabilities. Here we propose a solid-solid phase transformation model for roughening instability in the interface between two porous materials with different porosities under normal compression stresses. This instability is triggered by a finite jump in the free energy density across the interface, and it leads to the formation of finger-like structures aligned with the principal direction of compaction. The model is proposed as an explanation for the roughening of stylolites - irregular interfaces associated with the compaction of sedimentary rocks that fluctuate about a plane perpendicular to the principal direction of compaction.

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