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论文类型：期刊论文

发表时间：2015-03-01

发表刊物：CONSTRUCTION AND BUILDING MATERIALS

收录刊物：SCIE、EI

卷号：78

页面范围：243-249

ISSN号：0950-0618

关键字：Concrete; Fracture mechanics; R-curve; Energy release rate; Local fracture energy

摘要：A three-parameter R-curve is derived where R-curve is defined as the envelope of critical energy release rate of specimens with different size. The idea underpinning the proposed R-curve is that energy required for progressing a pre-crack is composed of two parts: initial fracture energy and driving energy for crack extension. The three crucial parameters introduced in the proposed R-curve are material properties, and they can be determined experimentally on concrete specimens of regular size. The predicted fracture responses of mortar under single-edge notch tension (SENT), concrete and rock beams under three-point bending (TPB) from the proposed R-curve agree well with the test results. The proposed R-curve is independent of specimen size, and the local fracture energy from the material's softening function may provide a possible explanation for the nature of the R-curve. (C) 2015 Elsevier Ltd. All rights reserved.