High-temperature shear zone formation in Carrara marble: The effect of loading conditions

One folder contains the ASCII files from four high temperature torsion deformation experiments performed with the Paterson gas apparatus in GFZ Potsdam on cylinders of Carrara marble containing single inclusions of Solnhofen limestone.
The second folder contains the raw EBSD data collected on the same four samples with a a FEI Quanta 3D FEG dual beam machine equipped with an EDAX-TSL Digiview IV EBSD detector and the TSL software OIM 5.31.
The experiments aimed at verifying the potential effect of different loading condition (constant stress vs constant strain rate deformation) on the amount and efficiency of ductile deformation localization in what is effectively reproducing the natural case of a homogeneus rock body containing a material heterogeneity.
The results showed substantial similarity of microstructures and textures between samples deformed under different loading conditions: high temperature creep of marble is the main deformation mechanism leading to the formation of a distinct shear zone spatially associated with the presence of the limestone inclusion. Episodic brittle deformation is also present in all the samples examined.
Overall, our results suggest that the loading conditions do not significantly affect strain localization induced by the presence of a material heterogeneity during nucleation and transient evolution stages.

一个文件夹包含了在GFZ波茨坦使用帕特森气体装置对卡拉拉大理石圆柱体进行四次高温扭转变形实验产生的ASCII文件，其中圆柱体内含有单一的索尔诺夫恩石灰岩夹杂物。第二个文件夹包含了使用配备EDAX-TSL Digiview IV EBSD探测器及TSL软件OIM 5.31的FEI Quanta 3D FEG双束机收集的相同四个样本的原始EBSD数据。实验旨在验证不同加载条件（恒定应力与恒定应变率变形）对有效模拟含材料异质性的均匀岩石体中韧性变形局部化程度及效率的潜在影响。结果表明，在不同加载条件下变形的样本间，其显微结构和纹理具有显著相似性：高温蠕变是大理石的主要变形机制，导致形成与石灰岩夹杂物空间相关的明显剪切带。在所有考察的样本中也存在间歇性脆性变形。总体而言，我们的研究结果表明，加载条件对材料异质性在成核和瞬态演化阶段诱导的应变局部化没有显著影响。