Experimental Study of Crack Propagation in Cracked Concrete
Open Access
- 12 October 2019
- Vol. 12 (20), 3854
- https://doi.org/10.3390/en12203854
Abstract
The intersection of cracks has an important role in the key technology of hydraulic fracturing for enhancing the recovery of tight hydrocarbon reservoirs. On the basis of digital image correlation technology, three-point bending tests of concrete beams with an edge crack and a central preset crack were conducted to investigate the propagation of cracks after intersection in concretes. Concrete beams with cracks of different positions, lengths, and approach angles were tested, and results were analyzed. In conclusion, the crack positions, crack lengths, and approach angles significantly influence the crack propagation in naturally cracked concrete. A large distance between the crack tip and central point at the preset transverse crack and crack length indicate a high possibility of the edge crack vertically crossing the preset crack. In particular, the crack restarts from the preset crack tip after intersection when the distance between two cracks is smaller than 30 mm and when the preset crack length is smaller than 40 mm. A large approach angle corresponds to a large carrying capacity of the beam and a high possibility of the crack propagating perpendicularly. An improved criterion of restart cracking after interaction is proposed, and the restart points of all tested beams are predicted and compared with the experimental results. A good agreement is observed, which proves that this criterion is reliable.Funding Information
- National Key Research and Development Project of China (2016YFC0401902)
- National Natural Science Foundation of China (51739008, 51527811)
This publication has 29 references indexed in Scilit:
- Tension softening curves of plain concreteConstruction and Building Materials, 2013
- An experimental investigation on the FPZ properties in concrete using digital image correlation techniqueEngineering Fracture Mechanics, 2011
- Analysis by a 3D DIC technique of volumetric deformation gradients: Application to polypropylene/EPR/talc compositesComposites Part A: Applied Science and Manufacturing, 2008
- The effect of contact conditions and material properties on the elasticity terminus of a spherical contactInternational Journal of Solids and Structures, 2006
- Application of a new cleavage fracture criterion for fracture toughness prediction for RPV steelsFatigue & Fracture of Engineering Materials & Structures, 2006
- Rock cutting study using linear elastic fracture mechanicsEngineering Fracture Mechanics, 1992
- Plane stress dynamic plastic field near a propagating crack tipInternational Journal of Fracture, 1987
- Critical local tensile stress as criterion of delayed brittle failureStrength of Materials, 1985
- On the principle of superposition for stress intensity factorsEngineering Fracture Mechanics, 1976
- On the Crack Extension in Plates Under Plane Loading and Transverse ShearJournal of Basic Engineering, 1963