Details

Autor(en) / Beteiligte

• Utter, Brian
• Behringer, R P

Titel

Experimental measures of affine and nonaffine deformation in granular shear

Ist Teil von

• Physical review letters, 2008-05, Vol.100 (20), p.208302-208302, Article 208302

Ort / Verlag

United States

Erscheinungsjahr

2008

Link zum Volltext

Quelle

American Physical Society

Beschreibungen/Notizen

• Through 2D granular Couette flow experiments, we probe failure and deformation of disordered solids under shear. Shear produces a mean azimuthal flow, smooth affine deformations, and irreversible so-called nonaffine particle displacements. We find that these processes are all of comparable magnitude and depend on the local shear rate. We compute the parameter of Falk and Langer characterizing nonaffine motion, Dmin2, and find that it is reasonably well described in terms of collections of single particles making locally nearly isotropic random steps, delta ri. Distributions for single particle nonaffine displacements, delta ri, satisfy P1(delta ri) proportional, variantexp[-|delta ri/Delta r|alpha] (alpha < or approximately 2).