Modelling of large-scale deformation patterning in geomaterials is important for predicting instabilities and failures in the Earth's crust. Shear band formation and the evolution of the bands is a predominant mechanism of deformation patterning. Independent rotations of separate grains/particles can affect the pattern formation by adding the effect of rotational degrees of freedom to the mechanism of instability. To model this mechanism we use a special experimental technique based on digital image correlation in order to recover both displacement and independent rotation fields in 2D physical models of granular material. In the physical model the particles are represented by smooth steel monodispersed disks with speckles painted on them to enable the rotation reconstruction. During the loading the deformation pattern undergoes stages of shear band formation followed by its dissolution due to re-compaction and particle rearrangement with the subsequent formation of multiple shear bands merging into a single one and the final dissolution. Also, patterns of rotations are observed at an intermediate scale between the scale of the particles and the scale of the shear band. © (2014) Trans Tech Publications, Switzerland.
|Title of host publication||Advanced Materials Research|
|Publisher||Trans Tech Publications|
|Publication status||Published - 2014|
|Event||11th International Fatigue Congress - Melbourne, Australia|
Duration: 2 Mar 2014 → 7 Mar 2014
|Conference||11th International Fatigue Congress|
|Period||2/03/14 → 7/03/14|