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Publication detail
ELIÁŠ, J.
Original Title
Boundary Layer Effect on Behavior of Discrete Models
Type
journal article in Web of Science
Language
English
Original Abstract
The paper studies systems of rigid bodies with randomly generated geometry interconnected by normal and tangential bonds. The stiffness of these bonds determines the macroscopic elastic modulus while the macroscopic Poisson’s ratio of the system is determined solely by the normal/tangential stiffness ratio. Discrete models with no directional bias have the same probability of element orientation for any direction and therefore the same mechanical properties in a statistical sense at any point and direction. However, the layers of elements in the vicinity of the boundary exhibit biased orientation, preferring elements parallel with the boundary. As a consequence, when strain occurs in this direction, the boundary layer becomes stiffer than the interior for the normal/tangential stiffness ratio larger than one, and vice versa. Nonlinear constitutive laws are typically such that the straining of an element in shear results in higher strength and ductility than straining in tension. Since the boundary layer tends, due to the bias in the elemental orientation, to involve more tension than shear at the contacts, it also becomes weaker and less ductile. The paper documents these observations and compares them to the results of theoretical analysis.
Keywords
boundary layer; wall effect; discrete model; elasticity; fracture; concrete
Authors
Released
10. 2. 2017
Publisher
MDPI
ISBN
1996-1944
Periodical
Materials
Year of study
10
Number
2
State
Swiss Confederation
Pages from
1
Pages to
16
Pages count
URL
http://www.mdpi.com/1996-1944/10/2/157
Full text in the Digital Library
http://hdl.handle.net/11012/181099
BibTex
@article{BUT134896, author="Jan {Eliáš}", title="Boundary Layer Effect on Behavior of Discrete Models", journal="Materials", year="2017", volume="10", number="2", pages="1--16", doi="10.3390/ma10020157", issn="1996-1944", url="http://www.mdpi.com/1996-1944/10/2/157" }