Rock-Concrete Interfacial Crack Propagation under Mixed Mode I-II Fracture
Publication: Journal of Engineering Mechanics
Volume 144, Issue 6
Abstract
Experimental tests were conducted on composite rock-concrete specimens with four roughness profiles to investigate the propagation of interfacial cracks under three-point bending and four-point shear conditions. By measuring the initial fracture loads, various combinations of interfacial stress intensity factors (SIFs) of Modes I and II corresponding to the initial fracture conditions were determined. Based on these results, an expression for classifying the initiation of interfacial cracks in mixed Mode I-II fracture was derived by normalization, which could eliminate the effect of interfacial roughness. Furthermore, a criterion for specifying propagation of the interfacial crack that takes into account nonlinear interfacial characteristics was proposed, which indicated that the crack would start to propagate along the interface when the SIFs caused by the external loads and the cohesive stresses satisfied this criterion. Numerical simulations of the interfacial fracture process were also conducted, introducing the crack propagation criterion to predict load–versus crack mouth opening displacement (P-CMOD) curves. They revealed fairly good agreement with the experimental results. Finally, by combining the criterion for maximum circumferential stress with the proposed criterion for crack propagation, the interfacial crack propagation mode was assessed. The results indicated that, once the initial fracture toughnesses for the rock, the concrete, and the rock-concrete interface from the experimental work were obtained, the propagation of interfacial cracks and the corresponding fracture modes, including nonlinear characteristics of the materials and interface, could be predicted using the method derived in this study.
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Acknowledgments
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Grant Nos. NSFC 51478083, NSFC 51421064, and NSFC 51109026), of the Fundamental Research Funds for the Central Universities of China (Grant DUT17LK06), and of the Natural Science Foundation of Liaoning Province of China (Grant 20170540183).
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Published In
Journal of Engineering Mechanics
Volume 144 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 2, 2017
Accepted: Dec 13, 2017
Published online: Apr 13, 2018
Published in print: Jun 1, 2018
Discussion open until: Sep 13, 2018
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