Characterization of mixed mode crack opening in concrete
Publication: Research - peer-review › Journal article – Annual report year: 2011
Standard
Characterization of mixed mode crack opening in concrete. / Jacobsen, Jonas Sejersbøl; Poulsen, Peter Noe; Olesen, John Forbes.
In: Materials and Structures, Vol. 45, No. 1-2, 2012, p. 107-122.Publication: Research - peer-review › Journal article – Annual report year: 2011
Harvard
APA
CBE
MLA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Characterization of mixed mode crack opening in concrete
AU - Jacobsen,Jonas Sejersbøl
AU - Poulsen,Peter Noe
AU - Olesen,John Forbes
PY - 2012
Y1 - 2012
N2 - In real concrete structures cracks often open in mixed mode after their initiation. To capture the direct material behavior of a mixed mode crack opening a stiff biaxial testing machine, capable of imposing both normal and shear loads on a given crack area, has been applied. The opening and sliding components of the mixed mode displacement are measured using a custom made orthogonal gauge, and the measurements are used directly as the closed loop control signals. A double notch, concrete specimen is used for the crack investigation. The tests are divided into two steps, a pure Mode I opening step, where a macro crack is initiated in the specimen followed by the mixed mode opening step. The high stiffness of the set-up together with the closed control loop ensures a stable crack initiation followed by a controllable mixed mode opening. The deep notches result in a plane crack, only influenced by material aspects such as the aggregate size and concrete strength. Despite the occurrence of a few, local, secondary cracks during the mixed mode crack opening, the results can be treated as the mixed mode material point behavior of a crack in concrete. Results are reported for a range of mixed mode angles and for varying initial Mode I openings of the crack.
AB - In real concrete structures cracks often open in mixed mode after their initiation. To capture the direct material behavior of a mixed mode crack opening a stiff biaxial testing machine, capable of imposing both normal and shear loads on a given crack area, has been applied. The opening and sliding components of the mixed mode displacement are measured using a custom made orthogonal gauge, and the measurements are used directly as the closed loop control signals. A double notch, concrete specimen is used for the crack investigation. The tests are divided into two steps, a pure Mode I opening step, where a macro crack is initiated in the specimen followed by the mixed mode opening step. The high stiffness of the set-up together with the closed control loop ensures a stable crack initiation followed by a controllable mixed mode opening. The deep notches result in a plane crack, only influenced by material aspects such as the aggregate size and concrete strength. Despite the occurrence of a few, local, secondary cracks during the mixed mode crack opening, the results can be treated as the mixed mode material point behavior of a crack in concrete. Results are reported for a range of mixed mode angles and for varying initial Mode I openings of the crack.
KW - Biaxial loading
KW - Constitutive behavior
KW - Mixed mode fracture
KW - Concrete
U2 - 10.1617/s11527-011-9754-5
DO - 10.1617/s11527-011-9754-5
M3 - Journal article
VL - 45
SP - 107
EP - 122
JO - Materials and Structures
T2 - Materials and Structures
JF - Materials and Structures
SN - 1359-5997
IS - 1-2
ER -