Abstract
The fracture mechanics parameters are used in different applications to formulae the classic criteria of failure as well as in computational models to analyze the concrete structures and other brittle materials. The parameters are determined using the specimens with notches. The study for assessing the influence of the notch curvature in specimen on fracture mechanics parameters, e.g. critical stress intensity factor, critical crack tip opening displacement and fracture energy, was performed on cement mortar as a typical quasi-brittle material. The U-shaped notches with a depth of 30 mm were formed during molding the specimens. The radius of notch curvature was changed in the range from 0.15 mm to 30.0 mm. The results obtained demonstrated that the notch curvature radius has a significant effect on the level of maximum stress and the parameters describing the cement composite resistance to cracking. Therefore, the experimental determination of the fracture characteristics requires a strict definition of the test conditions.DOI: http://dx.doi.org/10.5755/j01.sace.15.2.15376
Highlights
For cement composites and other brittle materials, fracture mechanics parameter identification requires the tests on the sample elements with pre-formed initial crack or notch
All other dimensions of specimen must be relatively large, which raises costs of research. This approach is easy to implement, but includes a narrow spectrum of geometry notches, and does not explain in which range of the geometry of initial defects the process of crack propagation should be analyzed based on the criteria of strength of materials, and in which – on the basis of fracture mechanics (Berto et al 2013, Berto and Barati 2011)
The results obtained confirmed the dependence of fracture mechanics parameters on the radius of the notch tip in the test specimen
Summary
For cement composites and other brittle materials, fracture mechanics parameter identification requires the tests on the sample elements with pre-formed initial crack or notch. For brittle materials, such as concrete, ceramics or rocks, the process of obtainment the initial crack is difficult to control. All other dimensions of specimen must be relatively large, which raises costs of research This approach is easy to implement, but includes a narrow spectrum of geometry notches (cracks), and does not explain in which range of the geometry of initial defects the process of crack propagation should be analyzed based on the criteria of strength of materials, and in which – on the basis of fracture mechanics (Berto et al 2013, Berto and Barati 2011)
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