Verification of the applicability of lattice model to concrete fracture by AE study

Sagar, R Vidya and Prasad, Raghu BK and Karihaloo, BL (2010) Verification of the applicability of lattice model to concrete fracture by AE study. In: International Journal of Fracture, 161 (2). pp. 121-129.

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Abstract

Notched three-point bend specimens (TPB) were tested under crack mouth opening displacement (CMOD) control at a rate of 0.0004 mm/s and the entire fracture process was simulated using a regular triangular two-dimensional lattice network only over the expected fracture proces zone width. The rest of the beam specimen was discretised by a coarse triangular finite element mesh. The discrete grain structure of the concrete was generated assuming the grains to be spherical. The load versus CMOD plots thus simulated agreed reasonably well with the experimental results. Moreover, acoustic emission (AE) hits were recorded during the test and compared with the number of fractured lattice elements. It was found that the cumulative AE hits correlated well with the cumulative fractured lattice elements at all load levels thus providing a useful means for predicting when the micro-cracks form during the fracturing process, both in the pre-peak and in the post-peak regimes.

Item Type:	Journal Article
Publication:	International Journal of Fracture
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Concrete fracture; Lattice model; Fuller distribution; Acoustic emission; Beam element; Acoustic emission energy; Load-CMOD
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	08 Mar 2010 13:06
Last Modified:	19 Sep 2010 05:56
URI:	http://eprints.iisc.ac.in/id/eprint/25907

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