Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-07-27

Journal: MECHANICS OF ADVANCED MATERIALS AND STRUCTURES

Included Journals: Scopus、EI、SCIE

Volume: 24

Issue: 10

Page Number: 797-808

ISSN: 1537-6494

Key Words: Cosserat continua; size effect; mesh-independent; strain softening; non-associated plasticity; progressive failure

Abstract: The finite element models of Cosserat continuum in two- and three-dimensions are presented. The size effects of a cantilever beam and a micro-rod, the well-posedness, the mesh-independent solutions of the boundary value problems with non-associated elastoplastic and strain softening constitutive behavior, and the progressive failure of the two- and three-dimensional vertical excavations are studied. Numerical results illustrate that the proposed Cosserat continuum models are capable of reflecting the size effects of micro-structures, preserving the well-posedness of the boundary value problem characterized by the strain localization, ensuring mesh-independent solutions, and simulating the entire progressive failure process occurring in engineering structures.