Correlation between tension softening relation and crack extension resistance in concrete |
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Authors: | Xiufang Zhang and Shilang Xu |
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Affiliation: | (1) Department of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, 116024, China |
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Abstract: | Changes of the material fracture toughness with crack propagation can be described by a crack extension resistance curve,
one of the fundamental fracture criteria in crack mechanics. Recently, experimental observation of the fracture behavior in
concrete was used to develop a new fracture criterion, the crack extension G
R resistance curve, to analyze crack propagation during the entire concrete fracture process. The variation of the crack extension
resistance is mainly associated with the energy consumption in the fracture process zone ahead of the stress-free crack tip.
The crack extension resistance is then a function of the softening curve, which is a basic mechanical property in the fracture
process zone. The relationship between the softening curve and the crack extension G
R resistance curve is then analyzed based on results of three-point bending beams tests. The results indicate that the characteristic
points of the crack extension resistance G
R curve is closely related to the characteristic point on used tension softening curve.
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Translated from Journal of Tsinghua University (Science and Technology), 2008, 48(3): 316–320 译自: 清华大学学报(自然科学版)] |
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Keywords: | concrete fracture process zone crack extension G R resistance tension softening curve |
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