TY - JOUR T1 - Micro-mechanical modelling of granular material. Part 1: Derivation of a second-gradient micro-polar constitutive theory JO - Acta Mechanica PY - 2001/09/29 AU - Suiker ASJ AU - de Borst R AU - Chang CS ED - DO - DOI: 10.1007/bf01261670 PB - Springer Science and Business Media LLC VL - 149 IS - 1-4 SP - 161 EP - 180 Y2 - 2024/12/25 ER -