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Author Jacobsen, J. S. ♦ Poulsen, P. N. ♦ Olesen, J. F.
Source SpringerLink
Content type Text
Publisher Springer Netherlands
File Format PDF
Copyright Year ©2011
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations
Subject Keyword Biaxial loading ♦ Concrete ♦ Mixed mode fracture ♦ Constitutive behavior ♦ Operating Procedures, Materials Treatment ♦ Structural Mechanics ♦ Civil Engineering ♦ Materials Science ♦ Building Materials ♦ Theoretical and Applied Mechanics
Abstract 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.
ISSN 13595997
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2011-06-24
Publisher Place Dordrecht
e-ISSN 18716873
Journal Materials and Structures
Volume Number 45
Issue Number 1-2
Page Count 16
Starting Page 107
Ending Page 122

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Source: SpringerLink