Abstract
An interpretation of the very complex failure mechanism in four point shear specimens of concrete is proposed. A size-scale transition between tensile strength failure and mixed mode crack propagation is demonstrated to occur. When the distance of the central supports is large, the tensile strength is overcome at the supports by flexure. When the same distance is small, the tensile strength is overcome in the middle of the specimen by splitting. Pure shear failure does not seem to activate locally. As a matter of fact, the mixed mode fracture energy is substantially equal to the mode I fracture energy G F , each crack growth step being produced by a mode I (or opening) mechanism.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
