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Size-independent fracture energy in plain concrete beams using tri-linear model

Muralidhara, S., Raghu Prasad, B. K., Karihaloo, Bhushan Lal and Singh, R. K. 2011. Size-independent fracture energy in plain concrete beams using tri-linear model. Construction and Building Materials 25 (7) , pp. 3051-3058. 10.1016/j.conbuildmat.2011.01.003

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The boundary effect or the size effect on the fracture properties of concrete has been studied assuming a bi-linear model for the distribution of local fracture energy concept. Boundary effect is observed not only near the back boundary but also near the notch tip, where a fictitious boundary seems to exist, separating the linear and non-linear fracture zones. In this paper a tri-linear function is assumed for the local fracture energy distribution along the ligament and expressions relating RILEM fracture energy and the size-independent fracture energy are developed. Transition ligament length measurements based on the acoustic emission (AE) histogram of events are used to obtain size-independent fracture energy. Length of the fracture process zone is identified in the AE histogram and compared with the value obtained from softening beam model. There seems to be a good agreement between the results.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: local fracture energy ; tri-linear model ; fictitious boundary ; size-independent fracture energy ; concrete
Publisher: Elsevier
ISSN: 0950-0618
Last Modified: 10 Jan 2018 08:17

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