A nonlinear model for mode I fracture of fiber reinforced concrete
Journal
American Concrete Institute, ACI Special Publication
Journal Volume
SP-118
ISBN
9780870316159
Date Issued
1990-01-01
Author(s)
Abstract
Conventional concrete and raortar are both major construction materials because of their advantages in durability, economy and comparably good mechanical properties. However, brittleness and low tensile strength are weak constitutions of these materials. Therefore, they provide less resistance to the propagation of cracks. Fibers can resist against the propagation of cracks due to the contribution of traction, resulting from the fibers-matrix bon mechanism, on the crack face. Some exact mathematical formulation to express the stress intensity factor and the crack opening displacement are proposed in this research to interpret the fracture behavior of fiber reinforced cementitious composites. Using these formulations two fracture criteria can be performed to evaluate the tendency of crack propagation of this composite material. These two criteria are stress intensity factor criterio and crack tip opening displacement criterion. In order to achieve a more reasonable solution the couple effect between the crack opening displacement and the fiber bridging traction is also considered. From the numerical results shown in this study, it is concluded that the fiber reinforced concrete provides higher resistance against the propagation of cracks than ordinary plain concrete and one can clearly understand the resistance ability of fibers for the fracture behavior of concrete.
Subjects
Composite materials | Crack propagation | Fiber reinforced concretes | Fracture properties | Plain concrete
Type
conference paper