论文成果
A three-parameter R-curve of concrete-like quasi-brittle materials
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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
- 文献类型：J
- 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.
