An r-curve approach for fracture of quasi-brittle materials
作者： Ouyang Chengsheng , Mobasher Barzin , Shah Surendra P.
DOI: 10.1016/0013-7944(90)90087-W
关键词: Range (statistics) 、 Mechanics 、 Envelope (mathematics) 、 Fracture (geology) 、 Brittleness 、 Structural engineering 、 Function (mathematics) 、 Crack growth resistance curve 、 Differential equation 、 Fracture mechanics 、 Materials science
摘要: An R-curve approach for fracture of quasi-brittle materials is proposed in this paper. An R-curve is defined as an envelope of fracture energy release rate of specimens with different sizes but the same initial notch length. By assuming that an effective traction-free critical crack is the function of an initial crack length contained in a material, an expression of the R-curve with two parameters can be derived by solving a differential equation. The parameters of the R-curve can be uniquely determined according to K IC S and CTOD c for positive …
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