Formation of chocolate-tablet boudins: Results from scaled analogue models
Formation of chocolate-tablet boudins: Results from scaled analogue models
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巧克力片布丁的形成：缩放模拟模型的结果
DOI：
10.1016/j.jsg.2014.09.005
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发表时间：
2014
影响因子：
3.1
通讯作者：
M. Peinl
中科院分区：
文献类型：
--
作者：
J. Zulauf;G. Zulauf;J. Göttlich;M. Peinl
我们使用幂律粘性橡皮泥作为岩石类似物来模拟经历位错蠕变的岩石的巧克力片布丁结构。垂直于主缩短方向 Z 的有效橡皮泥层在较弱的橡皮泥基体中经历两个阶段的平面应变，其中主拉伸轴 X 和不变轴 Y 从第一阶段到第二阶段相互替换。在平面应变的每个阶段，布丁格由粘性颈缩的初始阶段以及随后沿颈部区域的延伸断裂控制。有限应变 (e) 大小的增加和层厚度 (Hi) 的减小会导致布丁宽度 (Wa) 减小和布丁数量 (N) 增加。假设层与基体之间的粘度比 (m) 高于约。如图5所示，随着m值的增加，布丁数量减少，布丁宽度增加。本研究的一个意想不到的结果是，在每个实验中，在平面应变的第二阶段，布丁的数量显着更高。这种差异应该与基体橡皮泥对在布丁吉奇第一阶段形成的颈部区域中的硬层上的额外阻力有关。第二代布丁的长宽比（Wd=Wa/Hi）与天然布丁的长宽比以及使用解析解计算的长宽比兼容。
We used power-law viscous plasticine as a rock analogue to simulate chocolate tablet boudinage of rocks undergoing dislocation creep. A competent plasticine layer, oriented perpendicular to the main shortening direction,Z,underwent two phases of plane strain in a weaker plasticine matrix, with the principal stretching axis,X, and the axis of no-change,Y, replacing each other from the first to the second phase. In each phase of plane strain, boudinage was controlled by an initial phase of viscous necking followed by extension fracture along the neck domain. Increase in the magnitude of finite strain (e) and decrease in layer thickness (Hi) result in a decrease in the boudin width (Wa) and an increase in the number of boudins (N). Given the viscosity ratio between layer and matrix (m) is higher than ca. 5, the number of boudins decreases and the boudin width increases with increasing values ofm. An unexpected result of the present study is that in each experiment, the number of boudins was significantly higher during the second phase of plane strain. This difference should be related to additional drag of the matrix plasticine on the stiff layer in the neck domains formed during the first phase of boudinage. The aspect ratio of the second generation of boudins (Wd=Wa/Hi) is compatible with aspect ratios of natural boudins and with aspect ratios calculated using analytical solutions.
影响因子：
3.1
作者：
J. Zulauf;G. Zulauf;J. Hammer;F. Zanella
通讯作者：
J. Zulauf;G. Zulauf;J. Hammer;F. Zanella
布丁格片的起源：使用 powerâlaw 岩石类似物进行实验的结果
影响因子：
2.9
作者：
Zulauf;Zulauf;Gutiérrez-Alonso
通讯作者：
Gutiérrez-Alonso