论文成果
A three-parameter R-curve of concrete-like quasi-brittle materials
  • 点击次数:
  • 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.

上一条: On geometry dependent R-curve from size effect law for concrete-like quasibrittle materials

下一条: 混凝土路面碳纤维发热线融雪化冰研究