Micromechanics of fracture and failure in concrete under monotonic and fatigue loadings

Keerthana, K and Kishen, JMC (2020) Micromechanics of fracture and failure in concrete under monotonic and fatigue loadings. In: Mechanics of Materials, 148 .

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Abstract

In this research, the fracture processes in concrete subjected to monotonic and fatigue loadings are characterized and the differences in failure mechanisms are studied using acoustic emission (AE) and digital image correlation (DIC) techniques. Experiments are performed on notched plain concrete beams under three-point bending. The micro and macro structural activities are classified based on acoustic energy levels to differentiate between the formation of a fracture process zone (FPZ) under monotonic and fatigue loadings. It is observed that a FPZ within its conventional definition is formed under monotonic loading. On the contrary, the AE results under fatigue loading indicate isolated and dispersed micro cracks up to 95 of fatigue life. A damage index based on AE energy is proposed for concrete subjected to fatigue loading which could be used in health monitoring of structures. © 2020

Item Type:	Journal Article
Publication:	Mechanics of Materials
Publisher:	Elsevier B.V.
Additional Information:	Copy right for this article belongs to Elsevier B.V.
Keywords:	Concrete beams and girders; Damage detection; Fatigue of materials; Fracture; Structural health monitoring, D. digital image correlation (DIC); Failure mechanism; Fatigue loadings; Fracture process; Fracture process zone; Health monitoring of structure; Monotonic loading; Three point bending, Acoustic emission testing
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	24 Nov 2020 11:32
Last Modified:	24 Nov 2020 11:32
URI:	http://eprints.iisc.ac.in/id/eprint/65920

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